Estimate your Labradoodle's future adult weight to help with planning and care.
Labradoodle Weight Estimator
Enter the current weight of your Labradoodle puppy.
Enter the current age of your Labradoodle puppy in weeks.
Estimate the adult weight of the larger parent (e.g., Poodle or Labrador). This is a key factor.
Fleece/Wavy (Standard)
Wool (Similar to Poodle)
Hair (Similar to Labrador)
Coat type can influence final size and weight.
Estimated Adult Weight
—
Estimated Full Growth: — weeks
Weight at 1 Year: — lbs
Weight at 6 Months: — lbs
Formula Used: This calculator uses a common estimation method based on your puppy's current age and weight, alongside the expected adult weight of the parent. It assumes a growth curve that slows down significantly after 6-12 months. The coat type factor is an adjustment based on general observations of how coat types in doodles can correlate with breed influence.
Labradoodle Growth Curve Projection
● Estimated Growth■ Adult Target
Typical Labradoodle Adult Weight Ranges
Size Category
Parent Weight Range (lbs)
Typical Adult Weight (lbs)
Miniature
15 – 30
15 – 30
Medium
30 – 45
30 – 45
Standard
45 – 70+
45 – 70+
What is a Labradoodle Puppy Weight Calculator?
A Labradoodle puppy weight calculator is an online tool designed to help prospective and current Labradoodle owners estimate the adult weight of their puppy. Labradoodles, being a crossbreed between a Labrador Retriever and a Poodle, can exhibit a wide range of sizes depending on the generation (F1, F1b, F2, etc.), the size of the parent dogs, and genetic factors. This labradoodle puppy weight calculator provides an educated guess based on key inputs, offering valuable insights for owners.
Who Should Use This Labradoodle Puppy Weight Calculator?
This labradoodle puppy weight calculator is beneficial for several groups:
Prospective Owners: Those considering adopting a Labradoodle puppy can use it to gauge the potential adult size of the dog to ensure it fits their living space, lifestyle, and budget for food, grooming, and veterinary care.
New Puppy Owners: Individuals who have just brought home a young Labradoodle can use the calculator to get an idea of how large their puppy might grow, aiding in planning for larger beds, crates, and training equipment.
Concerned Owners: If an owner feels their puppy is growing too quickly or too slowly compared to expectations, this labradoodle puppy weight calculator can offer a benchmark for discussion with their veterinarian.
Common Misconceptions About Puppy Weight Estimation
Several myths surround predicting a puppy's adult weight. It's important to understand these to use tools like this labradoodle puppy weight calculator effectively:
"Paw Size is the Only Indicator": While larger paws *can* suggest a larger adult dog, it's not a definitive measure and doesn't account for genetic predispositions or breed mix ratios.
"All Puppies of the Same Age Weigh the Same": This is far from true. Factors like genetics, diet, health, and litter size play significant roles in a puppy's growth rate.
"The Calculator Guarantees Exact Weight": No calculator can predict the future with 100% certainty. Genetics are complex, and unexpected growth patterns can occur. This tool provides an *estimate*.
Labradoodle Puppy Weight Calculator Formula and Mathematical Explanation
The labradoodle puppy weight calculator employs a simplified formula that considers several critical factors. The core of the estimation often relies on established growth patterns for larger breeds, adjusted by the specific characteristics of the Labradoodle cross.
Step-by-Step Derivation
Base Growth Estimation: Many calculators use a general formula where a puppy's current weight is multiplied by a factor based on its age relative to its expected maturity. A common approach is to multiply the current weight by a factor derived from (Expected Adult Weight / Current Weight). However, this assumes linear growth, which isn't accurate. A more refined approach considers the puppy's age in weeks relative to typical growth completion (often around 12-18 months, or ~60-75 weeks).
Age Adjustment: Puppies grow fastest in the first 6-12 months. The formula accounts for this by applying a decreasing growth multiplier as the puppy gets older. For very young puppies (e.g., under 16 weeks), the multiplier is higher. For older puppies (e.g., 24+ weeks), it's lower.
Parental Weight Factor: The expected adult weight of the larger parent is a primary input. This anchors the prediction to the genetic potential.
Coat Type Adjustment: While not a precise science, some anecdotal evidence suggests that different coat types in Labradoodles (like fleece, wool, or hair) can sometimes correlate with the dominant Poodle or Labrador traits, subtly influencing final size. A multiplier is applied for these variations.
Growth Completion Estimation: Based on the inputs, the calculator estimates the approximate age (in weeks) when the puppy will reach its mature size. This is typically around 12-18 months for most Labradoodles.
Calculation Logic (Simplified Representation): Estimated Adult Weight ≈ (Current Weight / Growth Factor based on Age) * (Parental Weight Factor) * Coat Type Multiplier The "Growth Factor based on Age" is complex and involves non-linear curves, often derived from veterinary growth charts. For simplicity, a common rule of thumb for puppies under 4-5 months is: (Weight at 4 months) * 2 ≈ Adult Weight. For older puppies, the multiplier decreases.
Variable Explanations
The labradoodle puppy weight calculator uses the following key variables:
Variable
Meaning
Unit
Typical Range
Current Puppy Weight
The weight of the puppy at the time of calculation.
lbs (Pounds)
1 – 50+
Current Age (Weeks)
The age of the puppy in weeks.
Weeks
1 – 50+
Estimated Adult Weight of Parent
The expected adult weight of the larger parent (Labrador or Poodle). Crucial for genetic potential.
lbs (Pounds)
20 – 80+
Coat Type
The type of coat the puppy has, which can be a minor indicator of genetic influence.
Multiplier (e.g., 0.9 to 1.1)
0.9 (Wool) – 1.1 (Hair)
Estimated Adult Weight (Result)
The calculator's prediction of the puppy's mature weight.
lbs (Pounds)
20 – 80+
Estimated Full Growth (Weeks)
The approximate age in weeks when the puppy is expected to reach its full adult size.
Weeks
50 – 75+
Weight at 1 Year
The projected weight of the puppy at 12 months old.
lbs (Pounds)
20 – 70+
Weight at 6 Months
The projected weight of the puppy at 26 weeks old.
lbs (Pounds)
15 – 50+
Practical Examples (Real-World Use Cases)
Example 1: Standard Labradoodle Puppy
Sarah has an 12-week-old Labradoodle puppy named Max. Max currently weighs 20 lbs. Sarah knows the father (a Standard Poodle) weighs around 65 lbs, and the mother (a Standard Lab) weighs around 55 lbs. Max has a wavy fleece coat. Sarah wants to know how big Max might get.
Inputs:
Current Puppy Weight: 20 lbs
Current Age: 12 weeks
Estimated Adult Weight of Parent (larger): 65 lbs
Coat Type: Fleece/Wavy (Multiplier: 1.0)
Calculator Output (Example):
Estimated Adult Weight: 58 lbs
Estimated Full Growth: 65 weeks
Weight at 1 Year: 55 lbs
Weight at 6 Months: 40 lbs
Interpretation: Based on the inputs, Max is projected to reach approximately 58 lbs as an adult. He's well on track for a standard-sized Labradoodle. Sarah can plan for adequate space and supplies for a dog of this size.
Example 2: Miniature Labradoodle Puppy
David has a 10-week-old Labradoodle puppy named Luna. Luna weighs 8 lbs. Her mother is a Miniature Poodle weighing about 30 lbs, and her father is a smaller Labrador weighing around 40 lbs. Luna has a very curly wool coat.
Inputs:
Current Puppy Weight: 8 lbs
Current Age: 10 weeks
Estimated Adult Weight of Parent (larger): 40 lbs
Coat Type: Wool (Multiplier: 0.9)
Calculator Output (Example):
Estimated Adult Weight: 35 lbs
Estimated Full Growth: 60 weeks
Weight at 1 Year: 32 lbs
Weight at 6 Months: 25 lbs
Interpretation: Luna is estimated to reach around 35 lbs as an adult, fitting into the medium-small to medium range for a Labradoodle. The wool coat might indicate slightly more Poodle influence in terms of size. David can prepare for a medium-sized companion.
How to Use This Labradoodle Puppy Weight Calculator
Using the labradoodle puppy weight calculator is straightforward. Follow these steps:
Gather Information: You'll need your puppy's current weight (in pounds), age (in weeks), and an estimate of the adult weight of the larger parent dog. Identify your puppy's coat type.
Enter Data: Input the gathered information accurately into the corresponding fields on the calculator. Ensure you select the correct coat type from the dropdown.
Calculate: Click the "Calculate Weight" button.
Review Results: The calculator will display the estimated adult weight, the projected age for full growth, and estimated weights at key milestones (1 year and 6 months). The chart will visually represent the growth projection.
Interpret: Use the results as a guide. Compare the estimated adult weight to typical ranges for Miniature, Medium, and Standard Labradoodles. Discuss any significant deviations or concerns with your veterinarian.
Reset or Copy: Use the "Reset" button to clear the fields and start over, perhaps with updated measurements. Use the "Copy Results" button to save or share the calculated information.
Decision-Making Guidance: Understanding your Labradoodle's potential size can influence decisions about training classes, food purchases, veterinary check-ups (ensuring appropriate vaccinations and deworming schedules for their expected size), and even home preparation (e.g., size of crates, beds, and gates).
Key Factors That Affect Labradoodle Results
While the labradoodle puppy weight calculator provides a good estimate, several factors can influence your puppy's actual adult weight. Understanding these helps manage expectations:
Genetics: This is the most significant factor. The specific genes inherited from both the Labrador Retriever and Poodle parents play the biggest role. Even within the same litter, puppies can vary considerably. The specific parent's weight is a strong indicator, but genetic lottery is always at play.
Generation (F1, F1b, F2, Multigen): First-generation (F1) Labradoodles are a 50/50 mix. F1b crosses involve breeding an F1 Labradoodle back to a Poodle, often resulting in a dog with more Poodle-like traits, including potentially size and coat. Later generations (F2, F3, Multigen) can have more unpredictable combinations.
Nutrition and Diet: A high-quality, balanced diet appropriate for the puppy's age and size is crucial. Overfeeding can lead to a larger, potentially overweight adult dog, while underfeeding can stunt growth. Consistent, appropriate feeding schedules are key.
Exercise and Activity Level: Sufficient exercise promotes healthy muscle development and helps maintain a healthy weight. Lack of activity can contribute to excessive weight gain, while appropriate exercise supports lean muscle mass.
Health Conditions: Certain health issues, like hormonal imbalances (e.g., hypothyroidism) or parasites, can affect a puppy's growth rate and final weight. Regular veterinary check-ups are essential to monitor health.
Deworming and Parasite Control: Internal parasites can rob a puppy of nutrients, hindering growth and potentially leading to a smaller adult size if not treated promptly. Consistent deworming is vital.
Neutering/Spaying: While not definitively proven to cause significant weight gain, hormonal changes associated with spaying or neutering can sometimes slightly alter metabolism or appetite, potentially influencing weight maintenance.
Frequently Asked Questions (FAQ)
Q1: How accurate is the Labradoodle puppy weight calculator?
A: The labradoodle puppy weight calculator provides an educated estimate. Accuracy can range from 70-90%, depending on the inputs and the uniqueness of the puppy's genetic makeup. It's a helpful guide, not a definitive prediction.
Q2: My puppy seems much smaller/larger than the calculator predicts. What should I do?
A: If your puppy's growth deviates significantly from the calculator's estimate, consult your veterinarian. They can assess your puppy's overall health, confirm if the growth pattern is normal for their genetics, and rule out any underlying health issues. Don't panic, as genetics can be surprising!
Q3: Does the parent's weight guarantee my puppy's weight?
A: It's a strong indicator, but not a guarantee. The puppy inherits genes from both parents. If one parent is significantly larger, it increases the likelihood of a larger puppy, but the genetic contribution from the other parent also matters.
Q4: What is the difference between an F1, F1b, and F2 Labradoodle regarding size?
A: F1 is a cross between a purebred Labrador and a purebred Poodle. F1b Labradoodles are F1s bred back to a Poodle, often resulting in smaller sizes and more hypoallergenic coats. F2 and subsequent generations involve crossing Labradoodles with Labradoodles, leading to a wider range of traits, including size.
Q5: At what age do Labradoodles stop growing?
A: Most Labradoodles reach their full adult height between 12-18 months old. They might continue to fill out and gain a bit of muscle or weight up to around 2 years of age.
Q6: Should I feed my puppy more if it's projected to be a large dog?
A: Always feed a high-quality puppy food formulated for the appropriate life stage and size category. Follow the feeding guidelines on the food packaging, adjusting slightly based on your puppy's body condition and activity level, and always consult your vet. Avoid overfeeding, as obesity can cause health problems, especially in growing large breeds.
Q7: How does coat type affect weight?
A: The coat type multiplier in the labradoodle puppy weight calculator is a general adjustment. A wool coat (more Poodle-like) might sometimes correlate with smaller size trends seen in Poodles, while a hair coat (more Lab-like) might align with Labrador size. It's a subtle influence compared to genetics.
Q8: Can I use this calculator for other doodle breeds?
A: While the general principles of puppy growth are similar, this specific labradoodle puppy weight calculator is optimized for Labradoodles. Other doodle breeds (like Goldendoodles or Bernedoodles) have different parent breeds with potentially different growth curves and size ranges, so their accuracy might vary.
Learn about the ideal amount and type of exercise for your energetic Labradoodle companion.
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var validWeight = validateInput('currentWeight', 'currentWeightError', 0);
var validAge = validateInput('currentAgeWeeks', 'currentAgeWeeksError', 0);
var validParentWeight = validateInput('expectedAdultWeight', 'expectedAdultWeightError', 0);
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var currentWeight = parseFloat(document.getElementById('currentWeight').value);
var currentAgeWeeks = parseFloat(document.getElementById('currentAgeWeeks').value);
var expectedAdultWeightParent = parseFloat(document.getElementById('expectedAdultWeight').value);
// Simplified estimation logic
// This logic is a heuristic and not a precise scientific formula.
// It aims to provide a reasonable estimate based on common growth patterns.
var estimatedAdultWeight;
var estimatedFullGrowthWeeks;
var weightAt1Year;
var weightAt6Months;
// General growth curve approximation
// Puppies grow fastest early on. Let's model a rough curve.
// A very basic model: growth slows down significantly after ~20 weeks.
// We'll use a combination of age and parent weight to estimate.
// Rough estimation: Puppy is X% of its final size at age Y.
// This is highly simplified. A real model would be complex.
// A common rule of thumb for medium-large breeds:
// Weight at 6 months is approx 2/3 of adult weight.
// Weight at 1 year is approx 90-95% of adult weight.
// Let's try to reverse-engineer from parent weight, adjusting for current age.
var baseEstimate = expectedAdultWeightParent; // Start with parent weight as a benchmark
// Adjustments based on current age and weight relative to expected parent size
if (currentAgeWeeks <= 10) { // Very young puppy
// A common rough estimate for very young pups: weight * 8 to reach adult weight.
// Or, if current weight is far from parent weight, scale towards it.
estimatedAdultWeight = (currentWeight / 0.15) * coatTypeMultiplier; // Rough scaling
estimatedFullGrowthWeeks = 65; // Typical range
weightAt6Months = estimatedAdultWeight * 0.66 * coatTypeMultiplier;
weightAt1Year = estimatedAdultWeight * 0.90 * coatTypeMultiplier;
} else if (currentAgeWeeks <= 20) { // Puppy growth phase
estimatedAdultWeight = (currentWeight / 0.35) * coatTypeMultiplier; // Less aggressive scaling
estimatedFullGrowthWeeks = 60 + (20 – currentAgeWeeks)/4 ; // Slower growth projection
weightAt6Months = estimatedAdultWeight * 0.66 * coatTypeMultiplier;
weightAt1Year = estimatedAdultWeight * 0.90 * coatTypeMultiplier;
} else if (currentAgeWeeks <= 40) { // Adolescent phase, slowing down
estimatedAdultWeight = (currentWeight / 0.70) * coatTypeMultiplier; // Minimal scaling
estimatedFullGrowthWeeks = 55 + (40 – currentAgeWeeks)/4 ; // Even slower projection
weightAt6Months = estimatedAdultWeight * 0.66 * coatTypeMultiplier;
weightAt1Year = estimatedAdultWeight * 0.90 * coatTypeMultiplier;
} else { // Approaching maturity
estimatedAdultWeight = currentWeight * 1.1 * coatTypeMultiplier; // Very little growth expected
estimatedFullGrowthWeeks = currentAgeWeeks + 4; // Already near full growth
weightAt6Months = estimatedAdultWeight * 0.66 * coatTypeMultiplier; // Will be capped near adult
weightAt1Year = estimatedAdultWeight * 0.90 * coatTypeMultiplier; // Will be capped near adult
}
// Ensure results don't vastly exceed parent's weight or fall below a reasonable minimum
var minPossibleWeight = Math.max(currentWeight, expectedAdultWeightParent * 0.4); // Don't predict below 40% of parent
var maxPossibleWeight = expectedAdultWeightParent * 1.2; // Don't exceed parent weight by too much
estimatedAdultWeight = Math.max(minPossibleWeight, Math.min(estimatedAdultWeight, maxPossibleWeight));
// Refine intermediate values based on the final estimatedAdultWeight
weightAt6Months = Math.min(weightAt6Months, estimatedAdultWeight * 0.7) * coatTypeMultiplier; // Ensure 6mo isn't over adult estimate
weightAt1Year = Math.min(weightAt1Year, estimatedAdultWeight * 0.95) * coatTypeMultiplier; // Ensure 1yr isn't over adult estimate
estimatedFullGrowthWeeks = Math.max(currentAgeWeeks + 2, estimatedFullGrowthWeeks); // Ensure growth weeks is always ahead of current age
document.getElementById('mainResult').textContent = estimatedAdultWeight.toFixed(1) + ' lbs';
document.getElementById('estimatedFullGrowthWeeks').textContent = 'Estimated Full Growth: ' + estimatedFullGrowthWeeks.toFixed(0) + ' weeks';
document.getElementById('weightAt1Year').textContent = 'Weight at 1 Year: ' + weightAt1Year.toFixed(1) + ' lbs';
document.getElementById('weightAt6Months').textContent = 'Weight at 6 Months: ' + weightAt6Months.toFixed(1) + ' lbs';
document.getElementById('results-display').style.display = 'block';
drawChart(estimatedAdultWeight, weightAt1Year, weightAt6Months, currentWeight, currentAgeWeeks, coatTypeMultiplier);
}
function resetCalculator() {
document.getElementById('currentWeight').value = '10';
document.getElementById('currentAgeWeeks').value = '8';
document.getElementById('expectedAdultWeight').value = '50';
document.getElementById('coatType').value = '1.0';
document.getElementById('currentWeightError').textContent = '';
document.getElementById('currentAgeWeeksError').textContent = '';
document.getElementById('expectedAdultWeightError').textContent = '';
document.getElementById('coatTypeError').textContent = '';
document.getElementById('results-display').style.display = 'none';
if (typeof chartInstance !== 'undefined') {
chartInstance.destroy(); // Destroy previous chart instance
}
var canvas = document.getElementById('growthChart');
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear canvas
}
function copyResults() {
var mainResult = document.getElementById('mainResult').textContent;
var estimatedGrowth = document.getElementById('estimatedFullGrowthWeeks').textContent;
var weight1Year = document.getElementById('weightAt1Year').textContent;
var weight6Months = document.getElementById('weightAt6Months').textContent;
var formula = "Formula Used: This calculator uses a common estimation method based on your puppy's current age and weight, alongside the expected adult weight of the parent. It assumes a growth curve that slows down significantly after 6-12 months. The coat type factor is an adjustment based on general observations of how coat types in doodles can correlate with breed influence.";
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estimatedGrowth + "\n" +
weight1Year + "\n" +
weight6Months + "\n\n" +
"Key Assumptions:\n" +
"Current Weight: " + document.getElementById('currentWeight').value + " lbs\n" +
"Current Age: " + document.getElementById('currentAgeWeeks').value + " weeks\n" +
"Parental Estimate: " + document.getElementById('expectedAdultWeight').value + " lbs\n" +
"Coat Type: " + document.getElementById('coatType').options[document.getElementById('coatType').selectedIndex].text + "\n\n" +
formula;
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// Charting Logic
var chartInstance = null; // To hold the chart instance
function drawChart(adultWeightEst, weight1yr, weight6mo, currentWeight, currentAgeWeeks, coatMultiplier) {
var ctx = document.getElementById('growthChart').getContext('2d');
// Destroy previous chart instance if it exists
if (chartInstance) {
chartInstance.destroy();
}
// Chart Data Preparation
var growthWeeks = [];
var projectedWeight = [];
var actualWeightData = []; // For showing current point
// Simulate growth weeks up to maturity
var maxGrowthWeeks = 75; // Typical maturity ~18 months
var step = Math.max(1, Math.floor(maxGrowthWeeks / 30)); // Aim for ~30 points
for (var w = 0; w <= maxGrowthWeeks; w += step) {
growthWeeks.push(w);
var projectedW = calculateProjectedWeightAtWeek(w, currentWeight, currentAgeWeeks, adultWeightEst, coatMultiplier);
projectedWeight.push(projectedW);
}
// Ensure the estimated adult weight is plotted precisely at a mature age
if (growthWeeks[growthWeeks.length – 1] < maxGrowthWeeks) {
growthWeeks.push(maxGrowthWeeks);
projectedWeight.push(adultWeightEst);
}
// Add current puppy weight point
actualWeightData.push({ x: currentAgeWeeks, y: currentWeight });
// Add 6 month & 1 year points for reference
actualWeightData.push({ x: 26, y: weight6mo }); // 6 months = 26 weeks
actualWeightData.push({ x: 52, y: weight1yr }); // 1 year = 52 weeks
chartInstance = new Chart(ctx, {
type: 'line',
data: {
labels: growthWeeks.map(function(week) { return week + "w"; }), // Labels for x-axis (weeks)
datasets: [{
label: 'Projected Growth',
data: projectedWeight,
borderColor: 'var(–primary-color)',
backgroundColor: 'rgba(0, 74, 153, 0.1)',
fill: true,
tension: 0.4, // Makes the line slightly curved
pointRadius: 3,
pointHoverRadius: 7
},
{
label: 'Adult Target',
data: Array(growthWeeks.length).fill(adultWeightEst), // Horizontal line at adult estimate
borderColor: 'var(–success-color)',
borderDash: [5, 5], // Dashed line
backgroundColor: 'rgba(40, 167, 69, 0.1)',
fill: false,
tension: 0,
pointRadius: 0
},
{
label: 'Current Weight',
data: actualWeightData,
borderColor: 'rgba(255,165,0,1)', // Orange for current
backgroundColor: 'rgba(255,165,0,0.5)',
fill: false,
type: 'scatter', // Use scatter for specific points
pointRadius: 6,
pointHoverRadius: 10
}]
},
options: {
responsive: true,
maintainAspectRatio: true, // Adjust as needed
scales: {
x: {
title: {
display: true,
text: 'Age (Weeks)'
},
min: 0,
// max: 80 // Adjust max weeks if needed
},
y: {
title: {
display: true,
text: 'Weight (lbs)'
},
beginAtZero: true
}
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plugins: {
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return label;
}
}
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legend: {
position: 'top',
}
}
}
});
}
// Helper function to calculate projected weight at a given week
// This needs to approximate the growth curve logic used in calculation
function calculateProjectedWeightAtWeek(targetWeek, currentWeight, currentAgeWeeks, estimatedAdultWeight, coatMultiplier) {
if (targetWeek = currentAgeWeeks
}
if (targetWeek === currentAgeWeeks) {
return currentWeight;
}
// This is a crucial part: approximating the growth curve logic.
// We need a formula that mimics the `estimatedAdultWeight` calculation.
// Let's use a simplified logistic growth model or a piecewise linear approximation.
// A simple piecewise linear approximation:
var growthRateEarly = 0.4; // Example: ~0.4 lbs per day for first few weeks = ~2.8 lbs/week
var growthRateMid = 0.2; // Example: ~0.2 lbs per day for next phase = ~1.4 lbs/week
var growthRateLate = 0.05; // Example: ~0.05 lbs per day nearing maturity = ~0.35 lbs/week
var maturityAge = 65; // weeks, approximate
// Adjust growth rates based on the final estimatedAdultWeight
// Larger dogs grow faster initially and for longer.
var scaleFactor = estimatedAdultWeight / 50; // Scale based on a 50lb average
var effectiveGrowthRateEarly = growthRateEarly * scaleFactor;
var effectiveGrowthRateMid = growthRateMid * scaleFactor;
var effectiveGrowthRateLate = growthRateLate * scaleFactor;
var weight = currentWeight;
var weeksPassed = targetWeek – currentAgeWeeks;
// Very rough estimation: Use proportions based on age segments.
// This is a highly simplified model and could be improved with more sophisticated curve fitting.
// Let's try to approximate the reverse logic used in calculateWeight()
// If currentAgeWeeks is 10, currentWeight is 8, parent is 40, coat is 0.9 -> adult is ~35.
// The formula implied something like: adult = current / (age_factor) * coat
// So, age_factor = current / (adult / coat)
// age_factor for 10 weeks = 8 / (35 / 0.9) = 8 / 38.8 = 0.205
// age_factor for 12 weeks = 20 / (58 / 1.0) = 20 / 58 = 0.345
// age_factor for 26 weeks (6mo) = weight_at_6mo / (adult / coat) -> e.g., 25 / (35/0.9) = 0.64
// age_factor for 52 weeks (1yr) = weight_at_1yr / (adult / coat) -> e.g., 32 / (35/0.9) = 0.73
// We need a function `getAgeFactor(week, estimatedAdultWeight)`
// Then `projectedWeight = currentWeight / getAgeFactor(currentAgeWeeks) * getAgeFactor(targetWeek)` ?? No, this is not right.
// Let's use a standard growth curve formula approximation:
// W(t) = W_max / (1 + exp(-k * (t – t0))) — Logistic function
// Or simpler: W(t) = W_max * (1 – exp(-k * t))
// Let's use the latter and fit parameters based on our estimates.
// We know W(currentAgeWeeks) = currentWeight and W(maturityAge) ≈ estimatedAdultWeight
// Let's try to find a 'k' (growth rate constant) and t0 (time shift)
// This requires iterative fitting or specific assumptions.
// Simpler approach: Assume a percentage of growth achieved by certain ages.
// 8 weeks: ~15-20%
// 12 weeks: ~30-35%
// 6 months (26 weeks): ~60-66%
// 1 year (52 weeks): ~90-95%
// Maturity (e.g., 65 weeks): 100%
// Calculate target percentage for targetWeek
var targetPercentage = 0;
if (targetWeek <= 8) targetPercentage = (targetWeek / 8) * 0.20;
else if (targetWeek <= 26) targetPercentage = 0.20 + ((targetWeek – 8) / (26 – 8)) * (0.66 – 0.20);
else if (targetWeek <= 52) targetPercentage = 0.66 + ((targetWeek – 26) / (52 – 26)) * (0.95 – 0.66);
else if (targetWeek = currentAgeWeeks && projectedW = 26 && projectedW = 52 && projectedW < weight1yr) { // Ensure 1yr weight is respected
projectedW = Math.max(projectedW, weight1yr);
}
return projectedW * coatMultiplier; // Apply coat multiplier
}
// Initial calculation on page load if inputs have default values
document.addEventListener('DOMContentLoaded', function() {
calculateWeight();
});