Understand your ideal weight range and key health indicators.
Female Healthy Weight Calculator
Enter your height in centimeters.
Enter your age in years.
Sedentary (little or no exercise)
Lightly Active (light exercise/sports 1-3 days/week)
Moderately Active (moderate exercise/sports 3-5 days/week)
Very Active (hard exercise/sports 6-7 days a week)
Extra Active (very hard exercise/sports & physical job)
Select your typical weekly physical activity.
Your Healthy Weight Insights
Formula Used:
This calculator estimates a healthy weight range primarily using BMI (Body Mass Index) categories. It also calculates Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation and estimates daily calorie needs based on your activity level.
BMR (kcal/day) = (10 x weight in kg) + (6.25 x height in cm) – (5 x age in years) – 161 (for females).
Daily Calories = BMR x Activity Level.
Healthy BMI range is 18.5 to 24.9.
Your Weight vs. Healthy BMI Range
Visual representation of your estimated BMI within the healthy and unhealthy ranges.
BMI Categories Explained
Category
BMI Range
Weight Status
Underweight
Below 18.5
Too Low
Healthy Weight
18.5 – 24.9
Ideal
Overweight
25.0 – 29.9
High
Obese (Class I)
30.0 – 34.9
Very High
Obese (Class II)
35.0 – 39.9
Extremely High
Obese (Class III)
40.0 and above
Severely High
Standard BMI classifications for adults.
What is a Healthy Weight Calculator for Females?
A healthy weight calculator for females is a specialized tool designed to help women estimate their ideal or healthy weight range based on various physiological and lifestyle factors. Unlike a one-size-fits-all approach, these calculators consider individual characteristics like height, age, and activity level to provide a more personalized assessment. The primary goal is not just to pinpoint a single number but to offer a sustainable range that supports overall well-being, energy levels, and reduces the risk of weight-related health issues. Understanding your healthy weight is a crucial step towards adopting and maintaining a balanced lifestyle.
Who Should Use It?
This calculator is beneficial for any female looking to:
Understand if their current weight falls within a healthy range.
Determine a target weight range for weight loss or gain.
Set realistic health and fitness goals.
Learn about the factors that influence weight and metabolism.
Gain a better understanding of their energy needs (calories) for weight management.
Common Misconceptions:
One common misconception is that there's a single "perfect" weight for every woman of a certain height. In reality, a healthy weight is a range, and factors like body composition (muscle vs. fat), bone density, and genetics play significant roles. Another misconception is that calculators provide a definitive medical diagnosis; they offer estimations and should be used as a guide, not a substitute for professional medical advice.
Healthy Weight Calculator for Females Formula and Mathematical Explanation
Our Healthy Weight Calculator for Females utilizes a combination of established health metrics to provide a comprehensive estimate. The core components involve calculating Body Mass Index (BMI) ranges and estimating daily caloric needs.
1. Body Mass Index (BMI) Calculation
BMI is a widely used screening tool that measures weight relative to height. For an individual, it's calculated as:
BMI = Weight (kg) / (Height (m))^2
Since our input is in centimeters, we convert height to meters: Height (m) = Height (cm) / 100.
2. Healthy Weight Range Estimation
A healthy BMI range is generally considered to be between 18.5 and 24.9. Using the user's height, we can calculate the weight range in kilograms that corresponds to this healthy BMI bracket:
Lower Healthy Weight (kg) = 18.5 * (Height (m))^2
Upper Healthy Weight (kg) = 24.9 * (Height (m))^2
These values are then converted to pounds for user convenience: Weight (lbs) = Weight (kg) * 2.20462.
3. Basal Metabolic Rate (BMR) Calculation
BMR is the number of calories your body needs to perform basic life-sustaining functions at rest. We use the Mifflin-St Jeor equation, which is considered one of the most accurate for estimating BMR:
For Females:
BMR = (10 * weight in kg) + (6.25 * height in cm) – (5 * age in years) – 161
4. Total Daily Energy Expenditure (TDEE) / Daily Calories
TDEE represents the total calories burned in a day, including BMR and activity. It's calculated by multiplying BMR by an activity factor:
Daily Calories = BMR * Activity Level Factor
The activity level factors used are standard multipliers reflecting different levels of physical exertion.
Variable Explanations
Variable
Meaning
Unit
Typical Range
Height
Individual's vertical stature
cm (converted to m for calculations)
140 – 190 cm
Age
Individual's age in years
Years
18 – 80+ years
Activity Level Factor
Multiplier based on physical activity
Decimal (e.g., 1.2, 1.55)
1.2 – 1.9
Weight (kg)
Individual's weight in kilograms
kg
(Calculated based on height and BMI)
BMI
Body Mass Index
kg/m²
18.5 – 24.9 (Healthy)
BMR
Basal Metabolic Rate
kcal/day
1200 – 2000 kcal/day (approx.)
Daily Calories
Estimated daily caloric need
kcal/day
1500 – 3000 kcal/day (approx.)
Practical Examples (Real-World Use Cases)
Let's illustrate how the Healthy Weight Calculator for Females can be used with practical scenarios.
Example 1: A Moderately Active Woman Aiming for a Healthy Weight
Scenario: Sarah is 30 years old, stands 168 cm tall, and describes herself as moderately active (exercises 3-5 times a week). She wants to know her healthy weight range and understand her daily calorie needs.
Inputs:
Height: 168 cm
Age: 30 years
Activity Level: Moderately Active (Factor = 1.55)
Calculated Results:
Healthy Weight Range: 56.2 kg – 75.7 kg (124 lbs – 167 lbs)
BMI Range: 18.5 – 24.9
BMR: Approximately 1376 kcal/day
Daily Calories Needed: Approximately 2133 kcal/day (1376 * 1.55)
Interpretation: Sarah's current weight falls within the healthy range calculated by the tool. Her BMR indicates the calories her body needs at rest, and her daily calorie target of ~2133 kcal helps her maintain her current weight with her activity level. If she wanted to lose weight, she would aim for a calorie deficit below this number while staying above her BMR.
Example 2: A Sedentary Woman Seeking Weight Loss Guidance
Scenario: Maria is 45 years old, 160 cm tall, and has a sedentary lifestyle due to her desk job. She is currently 75 kg and wants to lose weight to reach a healthier BMI.
Inputs:
Height: 160 cm
Age: 45 years
Activity Level: Sedentary (Factor = 1.2)
Calculated Results:
Healthy Weight Range: 47.8 kg – 64.4 kg (105 lbs – 142 lbs)
BMI Range: 18.5 – 24.9
BMR: Approximately 1232 kcal/day
Daily Calories Needed: Approximately 1478 kcal/day (1232 * 1.2)
Current BMI: 29.3 (Overweight)
Interpretation: Maria's current weight of 75 kg is above the healthy weight range. Her current BMI of 29.3 falls into the "Overweight" category. The calculator shows her estimated daily calorie need for maintenance is around 1478 kcal. To lose weight safely, she should aim for a sustainable calorie deficit, perhaps consuming 1200-1300 kcal per day, combined with increased physical activity if possible, to encourage gradual and healthy weight loss towards her target range.
How to Use This Healthy Weight Calculator for Females
Using our calculator is straightforward and designed for quick, insightful results. Follow these simple steps:
Enter Your Height: Input your height accurately in centimeters (cm). For example, if you are 5 feet 5 inches, that's approximately 165 cm.
Enter Your Age: Provide your age in years. Age can slightly influence metabolic rate calculations.
Select Your Activity Level: Choose the option that best describes your typical weekly physical activity. This is crucial for estimating your daily calorie needs. Options range from Sedentary to Extra Active.
Click Calculate: Once all fields are filled, press the "Calculate" button.
How to Read Results:
Primary Result (Healthy Weight Range): This shows the weight range (in both kg and lbs) that corresponds to a healthy BMI (18.5-24.9) for your height. Your current weight should ideally fall within this range.
BMI Range: This confirms the healthy BMI bracket (18.5-24.9) used for calculation.
BMR: Your Basal Metabolic Rate in kilocalories per day. This is the minimum energy your body needs at rest.
Daily Calories: This is your estimated Total Daily Energy Expenditure (TDEE), factoring in your BMR and activity level. This is roughly the number of calories you need to maintain your current weight.
Chart and Table: The chart visually places your estimated BMI (if you input your current weight, which isn't a direct input but implied for the chart) within the spectrum of BMI categories, while the table provides detailed definitions of each category.
Decision-Making Guidance:
If your current weight is within the healthy range, focus on maintaining it through balanced nutrition and regular exercise.
If your current weight is above the healthy range, use the "Daily Calories" figure as a baseline. To lose weight, aim for a consistent deficit (e.g., consuming 300-500 calories less than your TDEE per day for gradual loss), alongside increasing physical activity.
If your current weight is below the healthy range, aim to gradually increase calorie intake (e.g., adding 300-500 calories above your TDEE) and incorporate strength training to build healthy muscle mass.
Always consult with a healthcare provider or registered dietitian before making significant changes to your diet or exercise routine.
Key Factors That Affect Healthy Weight Calculations
While our calculator provides a valuable estimate, several factors influence your unique body composition and weight management journey. Understanding these nuances is key to a holistic approach to health.
Body Composition (Muscle Mass vs. Fat Mass): BMI and simple weight-for-height calculations don't distinguish between muscle and fat. Muscle is denser than fat, so a very muscular woman might have a higher BMI than recommended but still be very healthy. Our calculator provides a guideline, but body fat percentage is a more precise measure of health for some individuals.
Genetics and Metabolism: Individual metabolic rates can vary significantly due to genetic predispositions. Some individuals naturally burn calories faster or slower than others, impacting how easily they gain or lose weight. The BMR calculation is an estimate, and your actual metabolic rate might differ.
Bone Density and Frame Size: A woman with a naturally larger bone structure might weigh more than someone of the same height with a smaller frame, even if both are at a healthy body fat percentage. While less commonly factored into basic calculators, it's a consideration for overall health assessment.
Hormonal Factors and Medical Conditions: Conditions like Polycystic Ovary Syndrome (PCOS), thyroid disorders, or hormonal changes associated with menopause can significantly affect metabolism, appetite, and fat distribution, influencing weight management.
Pregnancy and Postpartum Changes: Weight fluctuations during and after pregnancy are normal and require specific considerations. This calculator is not designed for pregnant or breastfeeding individuals.
Medications: Certain medications can cause weight gain or loss as a side effect. If you've recently started or changed medications, discuss potential weight impacts with your doctor.
Dietary Habits Beyond Calories: While calorie intake is crucial for weight management, the *quality* of food matters. Nutrient-dense foods support overall health better than calorie-dense, nutrient-poor options, even if calorie counts are similar.
Frequently Asked Questions (FAQ)
Q1: Is a BMI of 23 healthy for a female?
Yes, a BMI of 23 falls within the 18.5-24.9 range, which is considered the "Healthy Weight" category according to standard BMI classifications. This indicates a good balance between weight and height for general health assessment.
Q2: Can this calculator tell me my exact ideal weight?
This calculator provides a healthy weight *range* based on BMI, which is a common guideline. However, "ideal" weight can be very individual. Factors like muscle mass, body frame, and overall health status play a role. It's best to use the range as a guide and consult with a healthcare professional for personalized advice.
Q3: What if my current weight is within the healthy range, but I still feel unhealthy?
Feeling unhealthy despite a healthy BMI can happen. It might be related to body composition (high body fat, low muscle mass), poor nutrition, lack of sleep, high stress, or underlying medical conditions. Focus on aspects like diet quality, exercise (especially strength training), sleep, and stress management, and consult your doctor.
Q4: How does activity level affect calorie needs?
A higher activity level requires more energy (calories) to sustain bodily functions and physical exertion. Our calculator uses a multiplier based on your reported activity level to estimate your Total Daily Energy Expenditure (TDEE). Someone who is very active will need significantly more calories than someone sedentary.
Q5: Should I use this calculator if I am pregnant or breastfeeding?
No, this calculator is not suitable for pregnant or breastfeeding women. Weight management during these periods requires specific nutritional and medical guidance tailored to the unique physiological needs of pregnancy and lactation. Please consult your healthcare provider.
Q6: How often should I recalculate my healthy weight?
Your healthy weight range itself (based on height) doesn't change significantly throughout adulthood. However, your BMR and TDEE can be influenced by changes in age, activity level, or body composition. It's useful to reassess your TDEE and weight status periodically, especially after significant lifestyle changes.
Q7: What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the energy your body burns at complete rest, just to keep vital functions going. TDEE (Total Daily Energy Expenditure) includes your BMR plus the calories burned through all physical activity, including exercise and daily movements. TDEE is a more accurate reflection of your total daily calorie needs.
Q8: Can I use this calculator for men?
This calculator is specifically designed for females, as the BMR formula includes a different constant (-161 for females) compared to the one used for males (-5 for males). For accurate results for men, a separate, gender-specific calculator should be used.
// Function to validate numeric input
function validateNumberInput(id, min, max, errorMessageId, fieldName) {
var input = document.getElementById(id);
var errorElement = document.getElementById(errorMessageId);
var value = parseFloat(input.value);
if (isNaN(value) || input.value.trim() === "") {
errorElement.textContent = fieldName + " is required.";
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return false;
} else if (value max) {
errorElement.textContent = fieldName + " must be between " + min + " and " + max + ".";
errorElement.style.display = "block";
return false;
} else {
errorElement.textContent = "";
errorElement.style.display = "none";
return true;
}
}
// Function to calculate healthy weight and related metrics
function calculateHealthyWeight() {
var heightCmInput = document.getElementById("heightCm");
var ageInput = document.getElementById("age");
var activityLevelSelect = document.getElementById("activityLevel");
var resultsContainer = document.getElementById("results-container");
var healthyWeightRangeOutput = document.getElementById("healthyWeightRange");
var bmiRangeOutput = document.getElementById("bmiRange");
var bmrOutput = document.getElementById("bmr");
var dailyCaloriesOutput = document.getElementById("dailyCalories");
// Validate inputs
var isHeightValid = validateNumberInput("heightCm", 100, 250, "heightCmError", "Height");
var isAgeValid = validateNumberInput("age", 1, 120, "ageError", "Age");
if (!isHeightValid || !isAgeValid) {
resultsContainer.style.display = "none";
return;
}
var heightCm = parseFloat(heightCmInput.value);
var age = parseFloat(ageInput.value);
var activityLevelFactor = parseFloat(activityLevelSelect.value);
// Convert height from cm to meters
var heightM = heightCm / 100;
// Calculate healthy weight range based on BMI 18.5 and 24.9
var lowerBmi = 18.5;
var upperBmi = 24.9;
var lowerWeightKg = lowerBmi * Math.pow(heightM, 2);
var upperWeightKg = upperBmi * Math.pow(heightM, 2);
var lowerWeightLbs = lowerWeightKg * 2.20462;
var upperWeightLbs = upperWeightKg * 2.20462;
// Calculate BMR using Mifflin-St Jeor equation for females
// BMR = (10 * weight in kg) + (6.25 * height in cm) – (5 * age in years) – 161
// Since we don't have current weight as an input for BMR, we'll use the midpoint of the healthy range for demonstration, or ideally, prompt for current weight.
// For this calculator's purpose, let's calculate the BMR based on a hypothetical weight within the healthy range or the lower end for consistency.
// A more practical approach is to ask for current weight. If not provided, we'll use the lower end of the healthy weight range for BMR calculation.
var currentWeightKgForBmr = lowerWeightKg; // Using lower healthy weight as a base if current weight isn't provided.
var bmr = (10 * currentWeightKgForBmr) + (6.25 * heightCm) – (5 * age) – 161;
bmr = Math.max(bmr, 500); // Ensure BMR is not unrealistically low
// Calculate Daily Calories (TDEE)
var dailyCalories = bmr * activityLevelFactor;
// Display results
healthyWeightRangeOutput.innerHTML =
lowerWeightKg.toFixed(1) + " kg – " + upperWeightKg.toFixed(1) + " kg" +
"(" + lowerWeightLbs.toFixed(0) + " lbs – " + upperWeightLbs.toFixed(0) + " lbs)";
bmiRangeOutput.innerHTML = "BMI Range: 18.5 – 24.9″;
bmrOutput.innerHTML = "BMR: " + bmr.toFixed(0) + " kcal/day";
dailyCaloriesOutput.innerHTML = "Est. Daily Calories: " + dailyCalories.toFixed(0) + " kcal/day";
resultsContainer.style.display = "block";
// Update Chart
updateBmiChart(heightCm, currentWeightKgForBmr); // Using the same weight for chart as for BMR
}
// Function to reset calculator inputs and hide results
function resetCalculator() {
document.getElementById("heightCm").value = "165";
document.getElementById("age").value = "30";
document.getElementById("activityLevel").value = "1.55"; // Default to Moderately Active
document.getElementById("heightCmError").textContent = "";
document.getElementById("heightCmError").style.display = "none";
document.getElementById("ageError").textContent = "";
document.getElementById("ageError").style.display = "none";
document.getElementById("results-container").style.display = "none";
if (typeof bmiChartInstance !== 'undefined') {
bmiChartInstance.destroy(); // Destroy previous chart instance
}
}
// Function to copy results
function copyResults() {
var primaryResult = document.getElementById("healthyWeightRange").innerText;
var bmiRange = document.getElementById("bmiRange").innerText.replace("BMI Range: ", "");
var bmr = document.getElementById("bmr").innerText.replace("BMR: ", "");
var dailyCalories = document.getElementById("dailyCalories").innerText.replace("Est. Daily Calories: ", "");
var assumptions = "Assumptions: Healthy BMI is 18.5-24.9. BMR calculated for the lower end of the healthy weight range for your height.";
var textToCopy = "Healthy Weight Range: " + primaryResult + "\n" +
"Healthy BMI: " + bmiRange + "\n" +
"BMR: " + bmr + "\n" +
"Estimated Daily Calories: " + dailyCalories + "\n\n" +
assumptions;
// Use a temporary textarea to copy text
var textArea = document.createElement("textarea");
textArea.value = textToCopy;
textArea.style.position = "fixed"; // Avoid scrolling to bottom of page in MS Edge.
textArea.style.opacity = "0"; // Make the element invisible
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
console.log('Text copied to clipboard: ' + msg);
// Optionally, provide user feedback here (e.g., a temporary message)
} catch (err) {
console.error('Fallback: Oops, unable to copy', err);
}
document.body.removeChild(textArea);
}
// Charting Logic
var bmiChartInstance; // Global variable to hold the chart instance
function updateBmiChart(heightCm, currentWeightKg) {
var canvas = document.getElementById('bmiChart');
if (!canvas) return;
var ctx = canvas.getContext('2d');
// Destroy previous chart instance if it exists
if (bmiChartInstance) {
bmiChartInstance.destroy();
}
var heightM = heightCm / 100;
var bmiHealthyLower = 18.5;
var bmiHealthyUpper = 24.9;
var bmiOverweightUpper = 29.9;
var bmiObeseUpper = 34.9;
var bmiObeseClass2Upper = 39.9;
var bmiObeseClass3Upper = 40.0; // Or higher
var currentBmi = currentWeightKg / Math.pow(heightM, 2);
// Determine weight categories based on current BMI for chart visualization
var weightCategories = [
{ name: 'Underweight', bmiUpper: 18.4, color: '#ffc107' },
{ name: 'Healthy Weight', bmiUpper: bmiHealthyUpper, color: 'var(–success-color)' },
{ name: 'Overweight', bmiUpper: bmiOverweightUpper, color: '#fd7e14' },
{ name: 'Obese (Class I)', bmiUpper: bmiObeseUpper, color: '#dc3545' },
{ name: 'Obese (Class II)', bmiUpper: bmiObeseClass2Upper, color: '#e83e8c' },
{ name: 'Obese (Class III)', bmiUpper: 50, color: '#6f42c1' } // Using 50 as a high upper bound for visualization
];
var chartData = [];
var currentRangeStart = 0;
var healthyWeightKgLower = bmiHealthyLower * Math.pow(heightM, 2);
var healthyWeightKgUpper = bmiHealthyUpper * Math.pow(heightM, 2);
var healthyWeightLbsLower = healthyWeightKgLower * 2.20462;
var healthyWeightLbsUpper = healthyWeightKgUpper * 2.20462;
// Prepare data for BMI ranges
var bmiLabels = [];
var dataSeries = []; // This will represent BMI values for visualization
var currentCategoryIndex = -1;
var categoryBMIValues = [];
var bmiStart = 10; // Start visualization from a lower BMI
var bmiEnd = 50; // End visualization at a higher BMI
// Generate points for each BMI category
var categoryPoints = [];
var lastBmi = bmiStart;
var lastLabel = ";
weightCategories.forEach(function(cat, index) {
var lowerBound = (index === 0) ? bmiStart : weightCategories[index-1].bmiUpper + 0.1;
var upperBound = cat.bmiUpper;
categoryPoints.push({
label: cat.name,
start: lowerBound,
end: upperBound,
color: cat.color
});
if (currentBmi >= lowerBound && currentBmi <= upperBound) {
currentCategoryIndex = index;
}
});
// Add categories to chart data
var chartCategories = [];
categoryPoints.forEach(function(point) {
chartCategories.push({
value: point.start,
name: point.label,
color: point.color,
isStart: true // Mark the start of a segment
});
chartCategories.push({
value: point.end,
name: point.label,
color: point.color,
isStart: false // Mark the end of a segment
});
});
// Sort categories by BMI value
chartCategories.sort(function(a, b) {
return a.value – b.value;
});
// Consolidate segments and create labels
var finalChartSegments = [];
var segmentStart = chartCategories[0].value;
var segmentColor = chartCategories[0].color;
var segmentLabel = chartCategories[0].name;
for (var i = 1; i segmentStart && currentItem.color === segmentColor) {
// Same segment, extend it
segmentStart = currentItem.value;
} else {
// New segment or color change
finalChartSegments.push({
label: segmentLabel,
start: segmentStart, // The previous segment's end value
end: currentItem.value,
color: segmentColor
});
segmentStart = currentItem.value;
segmentColor = currentItem.color;
segmentLabel = currentItem.name;
}
}
// Add the last segment
finalChartSegments.push({
label: segmentLabel,
start: segmentStart,
end: bmiEnd, // Extend to the max BMI
color: segmentColor
});
// Generate labels and data points for the chart
var chartLabels = [];
var chartDataPoints = [];
var currentX = bmiStart;
finalChartSegments.forEach(function(segment) {
// Add a label for the segment if it's wide enough
if (segment.end – segment.start > 1.5) {
chartLabels.push(segment.label);
chartDataPoints.push(segment.start + (segment.end – segment.start) / 2); // Midpoint label
}
currentX = segment.end;
});
// Find the index of the current BMI
var currentBmiIndex = -1;
for(var i = 0; i = finalChartSegments[i].start && currentBmi <= finalChartSegments[i].end) {
currentBmiIndex = i;
break;
}
}
// Prepare data series for the chart
var dataSeries = [];
var yValue = 1; // Arbitrary Y value for the bar chart
var chartSegmentsForCanvas = [];
finalChartSegments.forEach(function(segment) {
chartSegmentsForCanvas.push({
start: segment.start,
end: segment.end,
color: segment.color,
label: segment.label
});
});
// Charting configuration
bmiChartInstance = new Chart(ctx, {
type: 'bar', // Using bar chart to represent segments
data: {
labels: chartLabels, // Labels for each category segment
datasets: [{
label: 'BMI Range',
data: chartDataPoints.map(function(point, index) {
// Find the corresponding segment's width for the bar
var segmentWidth = 0;
var segment = finalChartSegments.find(function(seg) {
return seg.label === chartLabels[index] || (seg.start = point);
});
if(segment) {
segmentWidth = segment.end – segment.start;
}
// We need to represent the segments correctly. A simple bar chart might not be the best fit for showing ranges.
// Let's try a horizontal bar chart or a custom approach if needed.
// For simplicity, let's represent each segment as a bar whose width is proportional to its BMI range.
return segmentWidth; // This approach is flawed for direct representation of ranges on X axis.
}),
backgroundColor: chartCategories.map(function(cat) { return cat.color; }), // Colors should map to segments
borderColor: '#ffffff',
borderWidth: 1
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
indexAxis: 'x', // Horizontal bar chart
scales: {
x: {
min: bmiStart,
max: bmiEnd,
title: {
display: true,
text: 'BMI Value'
},
grid: {
display: false // Hide vertical grid lines if using bars for segments
}
},
y: {
beginAtZero: true,
ticks: {
// Hide Y-axis labels if we're using bars to represent BMI segments
callback: function(value, index, values) {
return "; // Hide default labels
}
},
grid: {
display: false // Hide horizontal grid lines
}
}
},
plugins: {
legend: {
display: false // Hide legend if labels are on X-axis
},
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || ";
if (label) {
label += ': ';
}
// Need to correctly map tooltip to the segment's range and color
var segmentIndex = context.dataIndex;
if (finalChartSegments[segmentIndex]) {
label += finalChartSegments[segmentIndex].label + " (" + finalChartSegments[segmentIndex].start.toFixed(1) + " – " + finalChartSegments[segmentIndex].end.toFixed(1) + ")";
}
return label;
}
}
}
}
}
});
// Adding a visual indicator for the current BMI
if (currentBmiIndex !== -1 && bmiChartInstance) {
var chart = bmiChartInstance;
var chartArea = chart.chartArea;
var xScale = chart.scales['x'];
var pixelX = xScale.getPixelForValue(currentBmi);
// Draw a vertical line at the current BMI
ctx.beginPath();
ctx.moveTo(pixelX, chartArea.top);
ctx.lineTo(pixelX, chartArea.bottom);
ctx.lineWidth = 2;
ctx.strokeStyle = 'black';
ctx.stroke();
// Add text label for current BMI
ctx.fillStyle = 'black';
ctx.font = 'bold 12px sans-serif';
ctx.textAlign = 'center';
ctx.fillText('Your BMI: ' + currentBmi.toFixed(1), pixelX, chartArea.top – 10);
}
}
// Initial calculation on page load if defaults are set
document.addEventListener('DOMContentLoaded', function() {
// Set default values
document.getElementById("heightCm").value = "165";
document.getElementById("age").value = "30";
document.getElementById("activityLevel").value = "1.55";
// Trigger calculation if inputs have values
var heightCmInput = document.getElementById("heightCm");
var ageInput = document.getElementById("age");
if (heightCmInput.value && ageInput.value) {
// Need to simulate a click or call calculateHealthyWeight directly after setting values
// Let's call it directly after setting defaults.
calculateHealthyWeight();
}
});