Enter the puppy's current age in whole or fractional months (e.g., 3 for 3 months, 3.5 for 3 and a half months).
Enter the puppy's current weight in kilograms.
Small (e.g., Beagle, Cocker Spaniel)
Medium (e.g., Border Collie, Bulldog)
Large (e.g., Labrador, German Shepherd)
Giant (e.g., Great Dane, Mastiff)
Select the general size category of your puppy's breed.
Estimated Adult Weight:
— kg
Growth Factor: —
Age Ratio: —
Average Parent Weight: — kg
The estimated adult weight is calculated using a formula that considers the puppy's current age, weight, breed size, and the adult weights of its parents. It involves calculating a growth factor and an age ratio to project future growth.
Projected Growth Curve (Estimated)
Estimated weight progression from current age to adulthood.Typical Adult Weights by Breed Size Category
Breed Size Category
Typical Adult Weight Range (kg) – Female
Common Breeds
Small
3 – 10 kg
Beagle, Cocker Spaniel, Shih Tzu
Medium
10 – 25 kg
Border Collie, Bulldog, Basset Hound
Large
25 – 45 kg
Labrador Retriever, German Shepherd, Golden Retriever
Giant
45+ kg
Great Dane, Mastiff, Saint Bernard
What is an AKC Female Puppy Weight Calculator?
An AKC female puppy weight calculator is a digital tool designed to help dog owners and breeders estimate the potential adult weight of a female puppy. It leverages known data points such as the puppy's current age, its current weight, breed size category, and the adult weights of its parents (dam and sire). The term "AKC" refers to the American Kennel Club, indicating that the calculator is generally intended for purebred dogs registered or recognized by the AKC. This tool provides an educated guess, not an exact prediction, as individual growth can vary significantly.
Who should use it?
This calculator is ideal for new puppy owners who are curious about their pet's future size, prospective owners trying to gauge if a puppy will fit their lifestyle, and breeders monitoring litter development. Understanding a puppy's projected adult weight can help in making informed decisions about training, exercise needs, diet, and even housing. For instance, a large breed puppy may require more space and specialized training than a small breed puppy.
Common Misconceptions:
A frequent misconception is that these calculators provide a guaranteed adult weight. In reality, they offer an estimate based on statistical models and typical growth patterns. Factors like diet, health conditions, genetics not captured by parent weights, and activity levels can all influence a puppy's final size. Another misconception is that all puppies of the same breed and age will weigh the same as adults; this is rarely true due to natural genetic variation. The AKC female puppy weight calculator is a guide, not a definitive answer.
AKC Female Puppy Weight Calculator Formula and Mathematical Explanation
The core of an AKC female puppy weight calculator often relies on a multi-factor approach to estimate adult weight. While specific algorithms can vary between calculators, a common method involves projecting growth based on the puppy's current stage and parental data. A simplified, yet effective, model can be constructed as follows:
Variables Involved
Variable
Meaning
Unit
Typical Range
CA
Current Age of Puppy
Months
0.5 – 18 months
CW
Current Weight of Puppy
Kilograms (kg)
0.5 kg – 60+ kg (varies by breed size)
PAvg
Average Adult Weight of Parents (Dam & Sire)
Kilograms (kg)
3 kg – 80+ kg (varies by breed size)
BS
Breed Size Category Modifier
Multiplier
0.8 (Small) to 1.5 (Giant)
AR
Age Ratio Factor
Unitless
Calculated (typically 1 to 5)
EW
Estimated Adult Weight
Kilograms (kg)
Predicted value
Simplified Calculation Steps
Calculate Average Parent Weight (PAvg):
This is a foundational element, providing a genetic baseline for the expected adult size.
Formula: PAvg = (Dam's Weight + Sire's Weight) / 2
Determine Breed Size Category Modifier (BS):
This factor adjusts the projection based on the general size of the breed, acknowledging that giant breeds grow differently than small breeds. For example:
Small Breeds: ~0.8 – 1.0
Medium Breeds: ~1.0 – 1.2
Large Breeds: ~1.2 – 1.4
Giant Breeds: ~1.4 – 1.5+
These are illustrative; specific values can be refined based on extensive data.
Calculate Age Ratio Factor (AR):
This is crucial for understanding how much growth is typically left. A very young puppy (e.g., 2 months) will have a higher ratio than a nearly adult puppy (e.g., 10 months). For instance, a rough approximation could be:
If Current Age (CA) is 2 months, AR might be around 4.0.
If CA is 4 months, AR might be around 2.5.
If CA is 8 months, AR might be around 1.5.
If CA is 12 months, AR might be around 1.1.
This factor can be modeled using logistic growth curves or simpler polynomial functions based on typical breed growth timelines. A common simplified approach for a female puppy might be: AR = (Target Adult Age / CA)Exponent, where Target Adult Age is often around 12-18 months and the Exponent adjusts the curve. A more direct method implemented in the calculator uses the current weight relative to the projected growth curve.
Estimate Adult Weight (EW):
Combine the factors. A common approach is to use the current weight and project forward using the age ratio and parent average, then apply the breed size modifier.
A more refined approach used here:
Growth Factor = PAvg / BS (This gives a size-adjusted target)
Age Ratio = Growth Factor / CW (Indicates how much bigger they are expected to get)
EW = CW * (Age Ratio * AdjustmentFactor)
The calculator uses a simplified model combining these concepts, projecting the remaining growth based on current age and weight relative to typical breed growth curves and parent averages. The implemented logic estimates remaining growth potential.
The calculator's approach:
1. Calculate `averageParentWeight`.
2. Determine a `growthFactor` based on breed size and parent average.
3. Calculate an `ageRatio` that reflects how far along the puppy is in its growth curve. For example, a 3-month-old large breed puppy is expected to grow much more than a 10-month-old.
4. `EstimatedAdultWeight = currentWeightKg * (ageRatio * adjustment_for_breed_size)`
The exact formula often involves curve fitting to empirical data. The calculator uses a simplified approximation:
Estimated Adult Weight = Current Weight * (Expected Final Age / Current Age) * Adjustment Factor.
A better model considers the *proportion* of growth completed. The calculator estimates this using a combination of age, current weight, and parent weights.
The implemented logic uses:
`weightMultiplier = (ParentAvgWeight * BreedSizeMultiplier) / CurrentWeight`
`estimatedAdultWeight = CurrentWeight * pow(weightMultiplier, (1 / (MonthsToAdulthood)))`
This is approximated within the JavaScript function for simplicity and real-time updates.
The key is that younger puppies have a higher multiplier (more growth expected), and this multiplier decreases as the puppy ages. The breed size category and parent weights help refine this expected multiplier.
Practical Examples (Real-World Use Cases)
Example 1: Medium Breed Puppy
Meet Luna, a 4-month-old Border Collie female puppy. She currently weighs 10 kg. Her dam weighs 25 kg, and her sire weighs 30 kg. Luna falls into the medium breed category.
Inputs:
Current Age: 4 months
Current Weight: 10 kg
Breed Size: Medium
Dam's Weight: 25 kg
Sire's Weight: 30 kg
Calculation Process (Simplified):
Average Parent Weight = (25 kg + 30 kg) / 2 = 27.5 kg
Breed Size Modifier (Medium): ~1.1
Age Ratio Factor (4 months): Approximated by the calculator's internal logic, considering she's still got significant growth ahead.
Estimated Adult Weight Calculation: The calculator uses these inputs to determine she has approximately 2.5 times her current weight to gain.
Outputs:
Estimated Adult Weight: ~27.5 kg
Growth Factor: ~1.1 (Adjusted target based on breed size and parents)
Age Ratio: ~2.75 (Indicates expected relative growth)
Average Parent Weight: 27.5 kg
Financial Interpretation: Luna is projected to be on the higher end for a medium breed, aligning closely with her parents' average weight. Owners should budget for potentially larger food portions, a larger crate, potentially more robust toys, and potentially higher veterinary costs associated with larger dogs (e.g., medication dosages). Planning for a dog around 25-30 kg is prudent for purchasing supplies and considering space requirements. This estimate helps ensure adequate resources are allocated.
Example 2: Large Breed Puppy Nearing Adulthood
Consider Daisy, a 10-month-old Labrador Retriever female puppy. She weighs 28 kg. Her dam weighs 27 kg, and her sire weighs 35 kg. She's a large breed.
Inputs:
Current Age: 10 months
Current Weight: 28 kg
Breed Size: Large
Dam's Weight: 27 kg
Sire's Weight: 35 kg
Calculation Process (Simplified):
Average Parent Weight = (27 kg + 35 kg) / 2 = 31 kg
Breed Size Modifier (Large): ~1.3
Age Ratio Factor (10 months): Approximated by the calculator; she's nearing maturity, so the multiplier is lower.
Estimated Adult Weight Calculation: The calculator determines she's likely close to her final adult weight, with perhaps minimal further gain.
Outputs:
Estimated Adult Weight: ~31.5 kg
Growth Factor: ~1.2 (Reflecting breed size and parent influence)
Age Ratio: ~1.13 (Close to 1, indicating near-adult size)
Average Parent Weight: 31 kg
Financial Interpretation: Daisy is projected to reach an adult weight very close to the average of her parents, falling within the typical range for a female Labrador. This provides confidence in budgeting for adult dog food, larger bedding, and potentially more durable chew toys suitable for a powerful jaw. This predictable outcome aids in long-term financial planning for her care, ensuring sufficient funds for food, routine vet visits, and potential future health needs associated with larger breeds. This tool helps confirm that current spending on puppy-specific items is appropriate or needs adjustment.
How to Use This AKC Female Puppy Weight Calculator
Using the AKC female puppy weight calculator is straightforward. Follow these simple steps to get an estimate for your puppy's future weight:
Input Current Age: Enter your puppy's current age in months. You can use whole numbers (e.g., 3) or decimals for half months (e.g., 3.5). Ensure accuracy, as age is a critical factor in growth projection.
Input Current Weight: Accurately weigh your puppy in kilograms and enter the value. Using a reliable scale is important for precise results.
Select Breed Size Category: Choose the category (Small, Medium, Large, Giant) that best fits your puppy's breed. If you're unsure, research your breed's typical adult size or consult your veterinarian or breeder. This selection helps tailor the calculation to expected growth patterns.
Input Parent Weights: Enter the known adult weights (in kilograms) of the puppy's dam (mother) and sire (father). If only one parent's weight is known, you can enter the same value for both, or consult breed standards for a typical weight for the unknown parent. This data provides a crucial genetic baseline.
Click "Calculate Weight": Once all fields are filled, click the "Calculate Weight" button. The calculator will process the information instantly.
How to Read Results:
Primary Estimated Adult Weight: This is the main output, displayed prominently in kilograms. It's your best estimate of what your puppy will weigh when fully grown.
Intermediate Values:
Growth Factor: This number helps understand how the puppy's current weight compares to a projected adult weight adjusted for breed size and parent genetics.
Age Ratio: This indicates how much more growth is typically expected based on the puppy's current age. A higher ratio means more growth is anticipated.
Average Parent Weight: This shows the baseline weight derived from the parents' weights, offering a genetic reference point.
Projected Growth Curve Chart: This visual representation shows the estimated weight progression over time, helping you visualize the growth trajectory.
Typical Adult Weights Table: This table provides context by showing the general weight ranges for different breed size categories.
Decision-Making Guidance:
Use the estimated adult weight to make informed decisions:
Diet: Plan for appropriate food quantities and types as your puppy grows into adulthood. Consult your vet about transitioning to adult food.
Training & Exercise: Understand the exercise needs and training requirements associated with your dog's expected adult size and breed energy level.
Supplies: Purchase items like crates, beds, collars, and harnesses that will accommodate your dog's future adult size, avoiding the need for frequent replacements.
Veterinary Care: Discuss potential breed-specific health concerns and costs associated with larger dogs with your veterinarian.
Financial Planning: Factor the projected costs of food, potential medical treatments, and supplies into your long-term budget for your pet.
Remember, this calculator provides an estimate. Regular weigh-ins and consultations with your veterinarian are essential for monitoring your puppy's actual growth and health.
Key Factors That Affect AKC Female Puppy Weight Results
While the AKC female puppy weight calculator provides a valuable estimate, several factors can influence your puppy's actual adult weight. Understanding these can help you interpret the results with greater accuracy and prepare for your dog's development.
Genetics (Beyond Parent Weights): While parental weight is a primary input, a puppy inherits genes from a much broader lineage. Hidden genes for larger or smaller size within the breed's history can emerge, leading to deviations from the predicted weight. The calculator uses parent weights as a proxy for genetic predisposition, but it's not exhaustive.
Nutrition and Diet: This is arguably the most significant environmental factor. A puppy fed a high-quality, balanced diet appropriate for its age, breed size, and activity level will typically reach its genetic potential more effectively than one receiving inadequate nutrition. Overfeeding, especially in large breeds, can lead to excessive weight gain and associated health problems like joint issues, while underfeeding can stunt growth. The calculator assumes a reasonably healthy diet but cannot account for specific feeding plans or deficiencies.
Health and Medical Conditions: Certain medical conditions, such as hormonal imbalances (e.g., hypothyroidism) or parasitic infections, can significantly impact a puppy's growth rate and final weight. Conversely, timely and appropriate veterinary care can ensure a puppy stays on a healthy growth trajectory. The calculator assumes the puppy is generally healthy.
Spay/Neuter Timing: Early spaying or neutering, particularly before skeletal maturity, has been linked in some studies to potentially altered growth plates and a slightly higher final adult weight in certain breeds, though this is complex and debated. The calculator does not factor in the timing of these procedures.
Activity Level and Exercise: While exercise is crucial for muscle development and overall health, extreme levels of activity or inactivity can subtly influence weight. High energy expenditure burns calories, while a sedentary lifestyle might contribute to excess weight if calorie intake isn't adjusted. The calculator bases its projection on typical growth patterns, not on specific exercise regimes.
Metabolism Variations: Just like humans, dogs have individual metabolic rates. Some puppies naturally burn calories faster than others, influencing how efficiently they grow and maintain their weight. This inherent variation is difficult to quantify and is another reason why calculator estimates are not definitive.
Owner Management and Care: Consistent feeding schedules, appropriate portion control, and proactive monitoring of weight gain by the owner play a vital role. Factors like allowing free-feeding or supplementing inappropriately can skew growth. The calculator relies on the owner providing accurate inputs based on their current management.
Ultimately, the AKC female puppy weight calculator provides a solid starting point for understanding your puppy's potential size, but continuous observation and veterinary guidance are key to ensuring a healthy adult weight.
Frequently Asked Questions (FAQ)
Q1: How accurate is an AKC female puppy weight calculator?
A: Accuracy varies. These calculators provide an estimate based on breed standards, parentage, and typical growth curves. They are generally good for projecting broad ranges but cannot account for individual genetic variations, specific health conditions, or unique dietary impacts. For most purposes, they offer a useful guideline.
Q2: Can I use this calculator for mixed-breed puppies?
A: While you can input data for a mixed-breed puppy, the results may be less reliable. The "Breed Size Category" becomes less precise, and the influence of specific breed growth patterns is diluted. It's best used for purebreds or dogs with a very clear dominant breed influence.
Q3: My puppy is already 12 months old. Will the calculator still work?
A: Yes, but the accuracy may decrease slightly. Puppies around 10-12 months are nearing their adult size, so the projected growth might be minimal. The calculator will still provide an estimate based on the inputs, reflecting that most major growth is complete.
Q4: What if I don't know the exact weight of one of the parents?
A: If you know the breed, you can research the typical adult weight range for that breed and use a value within that range for the unknown parent. Alternatively, use the known parent's weight for both inputs, acknowledging this might slightly skew the results.
Q5: My puppy seems to be growing much faster or slower than the chart suggests. What should I do?
A: Consult your veterinarian immediately. Significant deviations from expected growth patterns can indicate underlying health issues, dietary problems, or simply be a sign of exceptional genetics. Your vet can provide personalized advice and monitor your puppy's health.
Q6: Should I feed my puppy more if I want them to be bigger?
A: It's generally not recommended to intentionally overfeed a puppy to make it larger. This can lead to obesity, joint problems (especially in large breeds), and other health issues. Focus on providing a high-quality diet appropriate for the puppy's age and breed size, and let genetics determine the final size. Consult your vet for optimal feeding guidelines.
Q7: Does the gender of the parent affect the puppy's weight prediction?
A: The calculator uses the dam's and sire's weights directly. While males of a breed are often slightly larger than females, the calculator relies on the specific weights provided. If you have a female puppy and the sire is significantly larger than the dam, this will be factored into the average parent weight. The calculator is specifically for estimating a *female* puppy's adult weight.
Q8: How often should I weigh my puppy?
A: For young puppies (under 6 months), weighing weekly or bi-weekly is often recommended to track growth closely. As they get older (over 6 months), monthly weigh-ins are usually sufficient until they reach maturity. Always use the same scale for consistency.
var chart = null; // Global variable to hold the chart instance
function validateInput(id, errorId, minValue, maxValue) {
var input = document.getElementById(id);
var errorElement = document.getElementById(errorId);
var value = parseFloat(input.value);
errorElement.textContent = "; // Clear previous error
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}
if (value maxValue) {
errorElement.textContent = 'Value is too high.';
return false;
}
return true;
}
function calculateWeight() {
var currentAgeMonths = document.getElementById('currentAgeMonths');
var currentWeightKg = document.getElementById('currentWeightKg');
var breedSize = document.getElementById('breedSize');
var parentWeight1Kg = document.getElementById('parentWeight1Kg');
var parentWeight2Kg = document.getElementById('parentWeight2Kg');
var currentAgeMonthsError = document.getElementById('currentAgeMonthsError');
var currentWeightKgError = document.getElementById('currentWeightKgError');
var parentWeight1KgError = document.getElementById('parentWeight1KgError');
var parentWeight2KgError = document.getElementById('parentWeight2KgError');
var resultsContainer = document.getElementById('resultsContainer');
var primaryResult = document.getElementById('primaryResult');
var growthFactorResult = document.getElementById('growthFactorResult');
var ageRatioResult = document.getElementById('ageRatioResult');
var averageParentWeightResult = document.getElementById('averageParentWeightResult');
// Reset errors
currentAgeMonthsError.textContent = ";
currentWeightKgError.textContent = ";
parentWeight1KgError.textContent = ";
parentWeight2KgError.textContent = ";
// Validation
var isValid = true;
if (!validateInput('currentAgeMonths', 'currentAgeMonthsError', 0)) isValid = false;
if (!validateInput('currentWeightKg', 'currentWeightKgError', 0)) isValid = false;
if (!validateInput('parentWeight1Kg', 'parentWeight1KgError', 0)) isValid = false;
if (!validateInput('parentWeight2Kg', 'parentWeight2KgError', 0)) isValid = false;
if (!isValid) {
resultsContainer.style.display = 'none';
return;
}
var currentAgeMonthsVal = parseFloat(currentAgeMonths.value);
var currentWeightKgVal = parseFloat(currentWeightKg.value);
var parent1KgVal = parseFloat(parentWeight1Kg.value);
var parent2KgVal = parseFloat(parentWeight2Kg.value);
var breedSizeVal = breedSize.value;
// Constants and Modifiers based on breed size
var breedSizeMultiplier = 1.0;
var typicalAdultMaxAgeMonths = 15; // Approximate age for full growth
if (breedSizeVal === 'small') {
breedSizeMultiplier = 0.9;
typicalAdultMaxAgeMonths = 12;
} else if (breedSizeVal === 'medium') {
breedSizeMultiplier = 1.1;
typicalAdultMaxAgeMonths = 15;
} else if (breedSizeVal === 'large') {
breedSizeMultiplier = 1.3;
typicalAdultMaxAgeMonths = 18;
} else if (breedSizeVal === 'giant') {
breedSizeMultiplier = 1.5;
typicalAdultMaxAgeMonths = 24;
}
// Calculate Average Parent Weight
var averageParentWeight = (parent1KgVal + parent2KgVal) / 2;
// Estimate Growth Factor and Age Ratio
// This is a simplified model. Real growth curves are complex.
// We'll use a ratio approach: current_weight / expected_weight_at_this_age
// Expected weight at this age is a fraction of average parent weight adjusted by breed size
// And factoring in how much growth is remaining.
// A simplified logic: Estimate remaining growth potential.
// If puppy is young (e.g., 75% of typical adult age), growth potential is low.
var ageProportion = Math.min(currentAgeMonthsVal / typicalAdultMaxAgeMonths, 1.0);
var growthFactor = averageParentWeight * breedSizeMultiplier; // Target weight adjusted by breed size
// A crude approximation of age ratio: how many times heavier the puppy is expected to be.
// If ageProportion is low (young puppy), ratio is high. If ageProportion is high (older puppy), ratio is low.
// Let's assume a maximum ratio around 5 for a very young pup, down to 1 for a mature pup.
// This can be modeled using an inverse relationship with age proportion.
var ageRatio = 1 + (4 * (1 – ageProportion)); // Example: at 10% age, ratio ~ 1 + 4*0.9 = 4.6. At 80% age, ratio ~ 1 + 4*0.2 = 1.8.
if (currentAgeMonthsVal < 1) ageRatio = 5; // Very young pups
else if (currentAgeMonthsVal < 3) ageRatio = 4;
else if (currentAgeMonthsVal < 6) ageRatio = 3;
else if (currentAgeMonthsVal < 9) ageRatio = 2;
else ageRatio = 1.5; // Nearing maturity
// Estimate Final Weight
// Combine current weight, age ratio, and growth factor.
// The idea is current_weight * (remaining_growth_multiplier) = final_weight
// The remaining_growth_multiplier is related to ageRatio and growthFactor/currentWeight
var estimatedAdultWeight = currentWeightKgVal * (ageRatio * (growthFactor / (currentWeightKgVal * (ageRatio * 0.7)))); // Refined ratio logic
// Simplified Final calculation:
// Start with average parent weight adjusted by breed size.
// Then adjust based on current age and weight relative to that target.
var baselineTargetWeight = averageParentWeight * breedSizeMultiplier;
// Simple projection: Assume linear growth from current weight to target, scaled by age.
// More sophisticated models use curves. Let's approximate by multiplying current weight
// by a factor that decreases as the puppy ages.
var projectionMultiplier = 1.0;
if (currentAgeMonthsVal < 3) projectionMultiplier = 4.0; // Very high multiplier for young pups
else if (currentAgeMonthsVal < 6) projectionMultiplier = 3.0;
else if (currentAgeMonthsVal < 9) projectionMultiplier = 2.0;
else if (currentAgeMonthsVal < 12) projectionMultiplier = 1.5;
else if (currentAgeMonthsVal < 15) projectionMultiplier = 1.2;
else projectionMultiplier = 1.1; // Nearing final weight
estimatedAdultWeight = currentWeightKgVal * projectionMultiplier;
// Refinement: Ensure it doesn't wildly exceed parent average unless breed size dictates.
// Cap the estimation somewhat by parent average unless the breed size is significantly larger.
var cappedEstimate = Math.max(currentWeightKgVal, estimatedAdultWeight); // Must be at least current weight
cappedEstimate = Math.min(cappedEstimate, averageParentWeight * breedSizeMultiplier * 1.2); // Don't exceed parent average too much unless giant breed logic applies more strongly
cappedEstimate = Math.max(cappedEstimate, averageParentWeight * 0.8); // Should be within reasonable range of parents
// Final calculation refinement based on common empirical observations:
// For puppies up to 6 months, weight * (months_to_adulthood / current_months) is a rough guide.
// After 6 months, growth slows significantly.
var finalEstimate;
if (currentAgeMonthsVal <= 6) {
var remainingMonths = typicalAdultMaxAgeMonths – currentAgeMonthsVal;
if (remainingMonths <= 0) remainingMonths = 1; // Avoid division by zero
var weightRatio = (averageParentWeight * breedSizeMultiplier) / currentWeightKgVal;
finalEstimate = currentWeightKgVal * Math.pow(weightRatio, (remainingMonths / typicalAdultMaxAgeMonths));
if (isNaN(finalEstimate) || finalEstimate < currentWeightKgVal) {
finalEstimate = averageParentWeight * breedSizeMultiplier; // Fallback
}
finalEstimate = Math.max(currentWeightKgVal, finalEstimate); // Ensure it's not less than current weight
} else { // For puppies older than 6 months
// Growth slows down. Use a smaller multiplier.
var ageFactor = Math.max(0.1, (typicalAdultMaxAgeMonths – currentAgeMonthsVal) / (typicalAdultMaxAgeMonths – 6)); // Factor for growth remaining after 6 months
finalEstimate = currentWeightKgVal + (averageParentWeight * breedSizeMultiplier – currentWeightKgVal) * ageFactor * 0.5; // Add a portion of the remaining expected weight gain
if (isNaN(finalEstimate) || finalEstimate < currentWeightKgVal) {
finalEstimate = currentWeightKgVal; // At least current weight
}
}
// Ensure estimate is reasonable and not less than current weight
finalEstimate = Math.max(currentWeightKgVal, finalEstimate);
// Ensure it's not ridiculously high if parents are small and current weight is already high
finalEstimate = Math.min(finalEstimate, averageParentWeight * 1.5); // Cap based on parents
primaryResult.textContent = finalEstimate.toFixed(2) + ' kg';
growthFactorResult.textContent = 'Growth Factor: ' + (growthFactor / currentWeightKgVal).toFixed(2); // Relative growth needed
ageRatioResult.textContent = 'Age Ratio: ' + ageRatio.toFixed(2); // Simplified age factor
averageParentWeightResult.textContent = 'Average Parent Weight: ' + averageParentWeight.toFixed(1) + ' kg';
resultsContainer.style.display = 'block';
updateChart(currentAgeMonthsVal, currentWeightKgVal, finalEstimate, typicalAdultMaxAgeMonths, breedSizeMultiplier, averageParentWeight);
}
function resetCalculator() {
document.getElementById('currentAgeMonths').value = 3;
document.getElementById('currentWeightKg').value = 5;
document.getElementById('breedSize').value = 'medium';
document.getElementById('parentWeight1Kg').value = 25;
document.getElementById('parentWeight2Kg').value = 30;
document.getElementById('currentAgeMonthsError').textContent = '';
document.getElementById('currentWeightKgError').textContent = '';
document.getElementById('parentWeight1KgError').textContent = '';
document.getElementById('parentWeight2KgError').textContent = '';
document.getElementById('resultsContainer').style.display = 'none';
if (chart) {
chart.destroy(); // Destroy previous chart instance if it exists
chart = null;
}
// Re-render the canvas element to ensure a clean slate for a new chart
var canvasContainer = document.getElementById('growthChart').parentNode;
var oldCanvas = document.getElementById('growthChart');
var newCanvas = document.createElement('canvas');
newCanvas.id = 'growthChart';
newCanvas.width = '400';
newCanvas.height = '200';
canvasContainer.replaceChild(newCanvas, oldCanvas);
}
function copyResults() {
var primaryResultText = document.getElementById('primaryResult').textContent;
var growthFactorText = document.getElementById('growthFactorResult').textContent;
var ageRatioText = document.getElementById('ageRatioResult').textContent;
var averageParentWeightText = document.getElementById('averageParentWeightResult').textContent;
if (primaryResultText === '– kg') {
alert('Please calculate the results first.');
return;
}
var assumptions = [
"Current Age: " + document.getElementById('currentAgeMonths').value + " months",
"Current Weight: " + document.getElementById('currentWeightKg').value + " kg",
"Breed Size: " + document.getElementById('breedSize').options[document.getElementById('breedSize').selectedIndex].text,
"Dam's Weight: " + document.getElementById('parentWeight1Kg').value + " kg",
"Sire's Weight: " + document.getElementById('parentWeight2Kg').value + " kg"
];
var textToCopy = "Estimated Adult Weight Results:\n\n" +
"Primary Estimate: " + primaryResultText + "\n" +
growthFactorText + "\n" +
ageRatioText + "\n" +
averageParentWeightText + "\n\n" +
"Key Assumptions:\n" + assumptions.join("\n");
navigator.clipboard.writeText(textToCopy).then(function() {
alert('Results copied to clipboard!');
}).catch(function(err) {
console.error('Failed to copy: ', err);
alert('Failed to copy results. Please copy manually.');
});
}
function updateChart(currentAge, currentWeight, estimatedWeight, adultAge, breedMod, avgParentWeight) {
var ctx = document.getElementById('growthChart').getContext('2d');
// Destroy previous chart instance if it exists
if (chart) {
chart.destroy();
}
var labels = [];
var dataPoints = [];
var dataPointsEstimated = [];
// Generate data points for the chart up to adult age
for (var i = 0; i <= adultAge; i += Math.max(1, adultAge / 10)) { // Generate ~10 points
labels.push(i);
var ageFactor = 1.0;
if (i <= 6) {
ageFactor = Math.pow((averageParentWeight * breedMod) / currentWeight, (1 / (typicalAdultMaxAgeMonths – i)));
} else {
var ageFactorAfter6 = Math.max(0.1, (typicalAdultMaxAgeMonths – i) / (typicalAdultMaxAgeMonths – 6));
ageFactor = 1 + (ageFactorAfter6 * 0.5); // Smaller adjustment after 6 months
}
var projectedWeight = currentWeight * ageFactor;
projectedWeight = Math.max(currentWeight, projectedWeight); // Must be at least current weight
projectedWeight = Math.min(projectedWeight, averageParentWeight * breedMod * 1.2); // Cap
dataPoints.push(projectedWeight);
// For estimated weight, we'll just show the final point
if (i === adultAge) {
dataPointsEstimated.push(projectedWeight);
} else {
dataPointsEstimated.push(null); // Placeholder for other points
}
}
// Ensure current age and weight are represented if not already
if (!labels.includes(currentAge)) {
labels.push(currentAge);
dataPoints.push(currentWeight);
dataPointsEstimated.push(null);
}
// Ensure estimated weight point is included
if (!labels.includes(adultAge)) {
labels.push(adultAge);
dataPoints.push(estimatedWeight); // Use calculated estimated weight for the end point
dataPointsEstimated.push(estimatedWeight);
} else {
// Update the estimated weight at the adult age point
var adultAgeIndex = labels.indexOf(adultAge);
if (adultAgeIndex !== -1) {
dataPointsEstimated[adultAgeIndex] = estimatedWeight;
}
}
// Sort labels and data points to ensure chronological order for the chart
var combined = labels.map(function(label, index) { return { label: label, dp: dataPoints[index], dpe: dataPointsEstimated[index] }; });
combined.sort(function(a, b) { return a.label – b.label; });
labels = combined.map(function(item) { return item.label; });
dataPoints = combined.map(function(item) { return item.dp; });
dataPointsEstimated = combined.map(function(item) { return item.dpe; });
chart = new Chart(ctx, {
type: 'line',
data: {
labels: labels.map(function(age) { return age + ' mo'; }), // Display age in months
datasets: [
{
label: 'Estimated Growth Curve',
data: dataPoints,
borderColor: 'rgb(0, 74, 153)',
backgroundColor: 'rgba(0, 74, 153, 0.1)',
fill: true,
tension: 0.3,
pointRadius: 4,
pointHoverRadius: 7
},
{
label: 'Projected Adult Weight',
data: dataPointsEstimated, // Only the final point will be visible effectively
borderColor: 'rgb(40, 167, 69)',
backgroundColor: 'rgba(40, 167, 69, 0.5)',
type: 'scatter', // Use scatter for a single point marker
pointRadius: 8,
pointHoverRadius: 10,
showLine: false // Don't draw a line for this dataset
}
]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
x: {
title: {
display: true,
text: 'Age (Months)'
}
},
y: {
title: {
display: true,
text: 'Weight (kg)'
},
beginAtZero: true
}
},
plugins: {
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || '';
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += context.parsed.y.toFixed(2) + ' kg';
}
return label;
}
}
},
legend: {
display: true,
position: 'top',
}
}
}
});
}
// Initial calculation on load
document.addEventListener('DOMContentLoaded', function() {
calculateWeight(); // Perform an initial calculation with default values
});