Enter your weight and height to calculate your BMI and determine your weight category.
Enter your weight in kilograms (kg).
Enter your height in centimeters (cm).
Your BMI Results
—
Weight Category:—
Ideal Weight Range (kg):—
Your BMI:—
Formula Used: BMI is calculated by dividing your weight in kilograms by the square of your height in meters. BMI = Weight (kg) / (Height (m))^2.
We convert your height from cm to meters for the calculation.
BMI Category Distribution
Visual representation of BMI categories and their corresponding ranges.
BMI Category
BMI Range
Health Implications
Underweight
Below 18.5
Increased risk of nutritional deficiencies, weakened immune system.
Normal Weight
18.5 – 24.9
Lower risk of weight-related health problems.
Overweight
25.0 – 29.9
Increased risk of heart disease, diabetes, and other chronic conditions.
Obesity (Class I)
30.0 – 34.9
Significantly increased risk of serious health issues.
Obesity (Class II)
35.0 – 39.9
Very high risk of serious health issues.
Obesity (Class III)
40.0 and above
Severe risk of serious health issues, potentially life-threatening.
What is a Weight Overweight Calculator?
A Weight Overweight Calculator, commonly known as a Body Mass Index (BMI) calculator, is a digital tool designed to help individuals assess their current weight status relative to their height. It provides a numerical value, the BMI, which categorizes a person into different weight groups such as underweight, normal weight, overweight, or obese. This assessment is a crucial first step in understanding potential health risks associated with weight and is widely used by healthcare professionals and individuals alike.
Who Should Use It?
Essentially, anyone concerned about their weight and its impact on their health can benefit from using a Weight Overweight Calculator. This includes:
Individuals looking to manage their weight (gain, lose, or maintain).
People wanting to understand their baseline health metrics.
Those seeking to identify potential health risks related to their current weight.
Fitness enthusiasts and athletes monitoring body composition.
Healthcare providers using it as an initial screening tool.
Common Misconceptions
It's important to note that BMI is a screening tool, not a diagnostic one. Some common misconceptions include:
BMI is a direct measure of body fat: While correlated, BMI doesn't distinguish between muscle and fat mass. A very muscular person might have a high BMI but low body fat.
BMI is definitive for health: A high BMI doesn't automatically mean poor health, and a normal BMI doesn't guarantee good health. Other factors like diet, exercise, and genetics play significant roles.
BMI applies equally to everyone: BMI calculations don't typically account for age, sex, ethnicity, or body composition differences, which can affect the interpretation of results.
Body Mass Index (BMI) Formula and Mathematical Explanation
The core of any Weight Overweight Calculator lies in its adherence to the universally accepted BMI formula. Understanding this formula is key to interpreting the results accurately.
Step-by-Step Derivation
The calculation involves a straightforward mathematical relationship between weight and height:
Obtain Weight: Measure your body weight accurately.
Obtain Height: Measure your height accurately.
Convert Units: Ensure your weight is in kilograms (kg) and your height is in meters (m). If your height is in centimeters (cm), divide by 100 to convert it to meters (e.g., 175 cm becomes 1.75 m).
Square Height: Calculate the square of your height in meters (Height (m) * Height (m)).
Divide Weight by Squared Height: Divide your weight in kilograms by the result from step 4.
Variable Explanations
The variables used in the BMI calculation are fundamental:
Variable
Meaning
Unit
Typical Range
Weight
The mass of the body.
Kilograms (kg)
Varies greatly; e.g., 40kg – 150kg+
Height
The vertical distance from the bottom of the feet to the top of the head.
Meters (m)
Varies; e.g., 1.50m – 2.00m+
BMI
Body Mass Index, a ratio of weight to height squared.
kg/m²
15 – 40+
Mathematical Formula
The standard formula implemented in a Weight Overweight Calculator is:
BMI = Weight (kg) / (Height (m))^2
Practical Examples (Real-World Use Cases)
Let's illustrate how the Weight Overweight Calculator works with practical scenarios:
Example 1: Achieving a Healthy Weight
Scenario: Sarah is 30 years old, weighs 85 kg, and is 165 cm tall. She wants to know her current BMI and if she falls into the overweight category.
Inputs:
Weight: 85 kg
Height: 165 cm (which is 1.65 m)
Calculation:
Height squared: (1.65 m)^2 = 2.7225 m²
BMI = 85 kg / 2.7225 m² ≈ 31.2 kg/m²
Results:
BMI: 31.2
Weight Category: Obesity (Class I)
Ideal Weight Range: Using the calculator's internal logic for a BMI of 22 (mid-normal range) and Sarah's height: Ideal Weight = 22 * (1.65 m)^2 ≈ 60 kg. The range for normal BMI (18.5-24.9) would be approximately 50.2 kg to 67.9 kg.
Interpretation: Sarah's BMI of 31.2 indicates she is in the Obesity (Class I) category. The calculator also shows her ideal weight range, suggesting she needs to lose significant weight to reach a healthier status. This insight motivates her to consult a doctor or nutritionist for a weight management plan.
Example 2: Tracking Progress
Scenario: David has been following a fitness program. Last month, his BMI was 27.5. Today, he weighs 80 kg and is 180 cm tall.
Inputs:
Weight: 80 kg
Height: 180 cm (which is 1.80 m)
Calculation:
Height squared: (1.80 m)^2 = 3.24 m²
BMI = 80 kg / 3.24 m² ≈ 24.7 kg/m²
Results:
BMI: 24.7
Weight Category: Normal Weight
Ideal Weight Range: For David's height (1.80m), the normal weight range (BMI 18.5-24.9) is approximately 60.1 kg to 80.8 kg.
Interpretation: David's BMI has decreased from 27.5 (Overweight) to 24.7 (Normal Weight). This shows his fitness efforts are paying off. The Weight Overweight Calculator helps him visually confirm his progress and stay motivated.
How to Use This Weight Overweight Calculator
Using our Weight Overweight Calculator is simple and quick. Follow these steps:
Step-by-Step Instructions
Enter Your Weight: In the "Weight" field, input your current body weight in kilograms (kg). Ensure accuracy for the best results.
Enter Your Height: In the "Height" field, input your height in centimeters (cm).
Click Calculate: Press the "Calculate BMI" button.
How to Read Results
Once you click "Calculate BMI", the calculator will display:
Your BMI: The primary numerical result, shown prominently.
Weight Category: A clear classification (Underweight, Normal Weight, Overweight, Obesity Class I, II, or III) based on your BMI.
Ideal Weight Range: An estimated range of weights that would place you in the "Normal Weight" category for your height.
The chart and table further illustrate where your BMI falls within the spectrum of healthy weights and the associated health implications.
Decision-Making Guidance
Your BMI result can guide your health decisions. If you are classified as overweight or obese, it may prompt you to consider lifestyle changes such as dietary adjustments and increased physical activity. If you are underweight, you might need to focus on gaining healthy weight. Remember, BMI is a starting point; consulting a healthcare professional is always recommended for personalized advice and comprehensive health assessments.
Key Factors That Affect Weight Overweight Calculator Results
While the BMI calculation itself is straightforward, several factors can influence its interpretation and relevance to an individual's health. Understanding these nuances is vital:
1. Body Composition (Muscle vs. Fat Mass)
The most significant limitation of BMI is its inability to differentiate between lean muscle mass and body fat. Athletes or individuals with highly developed musculature might have a high BMI and be classified as overweight or obese, despite having very little body fat and excellent cardiovascular health. Conversely, an elderly person or someone with sarcopenia (muscle loss) might have a normal BMI but a high percentage of body fat, indicating potential health risks.
2. Age
BMI interpretations can vary slightly with age. For instance, muscle mass naturally decreases with age, and body fat percentage may increase even if weight remains stable. Some health organizations may use slightly different BMI category thresholds or provide additional context for older adults.
3. Sex
Men and women tend to have different body compositions. On average, women have a higher percentage of body fat than men at the same BMI. While standard BMI charts don't differentiate by sex, this biological difference can impact health risks associated with a given BMI.
4. Ethnicity
Research indicates that certain ethnic groups may have different risks associated with specific BMI levels. For example, individuals of South Asian descent may be at higher risk for cardiovascular disease at a lower BMI compared to individuals of European descent. Some guidelines are beginning to incorporate these ethnic-specific considerations.
5. Skeletal Frame Size
Individuals with naturally larger bone structures (a "large frame") may weigh more than those with smaller frames, potentially leading to a higher BMI without necessarily having excess body fat. While difficult to precisely quantify for BMI calculations, it's a factor that healthcare providers consider.
6. Distribution of Body Fat
Where body fat is stored is a critical determinant of health risk. Visceral fat (fat around the abdominal organs) is more metabolically active and poses a greater risk for conditions like type 2 diabetes, heart disease, and stroke than subcutaneous fat (fat under the skin). BMI does not provide information on fat distribution; waist circumference measurements are often used in conjunction with BMI to assess this risk.
7. Pregnancy and Lactation
BMI calculations are not appropriate for pregnant or breastfeeding women. Weight gain during pregnancy is essential for fetal development, and standard BMI ranges do not apply. Healthcare providers monitor weight gain during these periods based on specific guidelines.
Frequently Asked Questions (FAQ)
What is the standard BMI range for adults?
The standard BMI ranges for adults are generally: Underweight: below 18.5, Normal weight: 18.5–24.9, Overweight: 25.0–29.9, and Obesity: 30.0 and above. These ranges are widely used by health organizations.
Can a Weight Overweight Calculator diagnose health problems?
No, a Weight Overweight Calculator is a screening tool, not a diagnostic one. It provides an indication of weight status. A healthcare professional should be consulted for a proper diagnosis and health assessment.
Is a BMI of 25 considered overweight?
Yes, a BMI of 25.0 and above is classified as overweight according to standard WHO guidelines. The "Overweight" category specifically ranges from 25.0 to 29.9.
How accurate is BMI for athletes?
BMI can be less accurate for athletes or individuals with high muscle mass, as muscle is denser than fat. They might have a high BMI due to muscle, not excess body fat, potentially misclassifying them as overweight or obese.
Should children and teenagers use the same Weight Overweight Calculator?
No, BMI for children and teenagers is calculated differently. It's based on age and sex-specific growth charts to account for normal variations in development. This calculator is designed for adults.
How often should I check my BMI?
Checking your BMI periodically, perhaps every few months or annually, can be helpful for tracking weight trends. However, focus more on overall healthy habits rather than solely on the number.
Can BMI predict longevity?
While BMI is correlated with certain health risks, it's not a direct predictor of lifespan. Factors like lifestyle, genetics, and access to healthcare also play crucial roles in longevity.
What is the ideal weight range for my height?
The "Ideal Weight Range" provided by the calculator is based on achieving a BMI between 18.5 and 24.9 for your specific height. This range is generally considered healthy for adults.
Remember, maintaining a healthy weight is a journey. Use this Weight Overweight Calculator as one tool among many to support your well-being. For personalized health advice, always consult with a qualified healthcare provider.
var weightInput = document.getElementById('weight');
var heightInput = document.getElementById('height');
var weightError = document.getElementById('weightError');
var heightError = document.getElementById('heightError');
var resultsContainer = document.getElementById('resultsContainer');
var mainResult = document.getElementById('mainResult');
var weightCategory = document.getElementById('weightCategory');
var currentBMI = document.getElementById('currentBMI');
var idealWeightRange = document.getElementById('idealWeightRange');
var bmiChartCanvas = document.getElementById('bmiChart');
var bmiChartInstance = null; // Variable to hold chart instance
function updateChart(bmiValue) {
if (bmiChartInstance) {
bmiChartInstance.destroy(); // Destroy previous chart instance if exists
}
var ctx = bmiChartCanvas.getContext('2d');
var data = {
labels: ['Underweight', 'Normal Weight', 'Overweight', 'Obesity I', 'Obesity II', 'Obesity III'],
datasets: [{
label: 'BMI Range',
data: [18.5, 6.4, 4.9, 4.9, 4.9, Infinity], // Width of each category range
backgroundColor: [
'rgba(255, 99, 132, 0.6)', // Underweight (Red)
'rgba(75, 192, 192, 0.6)', // Normal Weight (Green)
'rgba(255, 206, 86, 0.6)', // Overweight (Yellow)
'rgba(255, 159, 64, 0.6)', // Obesity I (Orange)
'rgba(255, 99, 132, 0.6)', // Obesity II (Reddish)
'rgba(54, 162, 235, 0.6)' // Obesity III (Blue)
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(75, 192, 192, 1)',
'rgba(255, 206, 86, 1)',
'rgba(255, 159, 64, 1)',
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)'
],
borderWidth: 1,
barPercentage: 1, // Full width bars
categoryPercentage: 1 // Full width bars
}]
};
var options = {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'BMI Value'
}
},
x: {
grid: {
display: false // Hide x-axis grid lines for a cleaner look
}
}
},
plugins: {
legend: {
display: false // Hide legend, labels on x-axis are sufficient
},
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || ";
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += context.parsed.y + ' kg/m²';
}
return label;
}
}
}
}
};
// We need to adjust the data structure for a proper range visualization.
// A simple bar chart representing the *width* of the range isn't ideal for showing *where* the user's BMI falls.
// Let's use a different approach: a single bar representing the user's BMI, with shaded areas for categories.
// This requires more complex chart setup or a different chart type.
// For simplicity with native canvas, let's illustrate the BMI ranges themselves.
// We'll use a horizontal bar chart or a custom drawing approach if needed.
// A simpler approach: show the user's BMI as a point on a conceptual scale.
// Let's re-think the chart to be more illustrative of BMI ranges.
// Alternative Chart Idea: A single horizontal bar representing the BMI scale, with user's BMI marked.
// Or, a series of bars representing the ranges, and a pointer for the user's BMI.
// For native canvas without libraries, a simple bar chart showing ranges is feasible.
// Let's redefine data to represent actual range boundaries and highlight the user's BMI.
var bmiCategories = [
{ name: 'Underweight', min: 0, max: 18.5, color: 'rgba(255, 99, 132, 0.6)' }, // Red
{ name: 'Normal Weight', min: 18.5, max: 24.9, color: 'rgba(75, 192, 192, 0.6)' }, // Green
{ name: 'Overweight', min: 25.0, max: 29.9, color: 'rgba(255, 206, 86, 0.6)' }, // Yellow
{ name: 'Obesity I', min: 30.0, max: 34.9, color: 'rgba(255, 159, 64, 0.6)' }, // Orange
{ name: 'Obesity II', min: 35.0, max: 39.9, color: 'rgba(255, 99, 132, 0.6)' }, // Reddish
{ name: 'Obesity III', min: 40.0, max: Infinity, color: 'rgba(54, 162, 235, 0.6)' } // Blue
];
var chartDataLabels = [];
var chartDataValues = [];
var chartBackgroundColors = [];
var chartBorderColors = [];
var chartMaxY = 50; // Set a reasonable max for Y axis
for (var i = 0; i < bmiCategories.length; i++) {
chartDataLabels.push(bmiCategories[i].name);
var value = Math.min(bmiCategories[i].max, chartMaxY) – bmiCategories[i].min;
// Ensure value is not negative due to max limit
if (value 0) {
userBMIDatasetLabel = 'Your BMI';
userBMIDatasetColor = 'rgba(0, 0, 0, 0.8)'; // Black with transparency
userBMIDatasetBorderColor = 'rgba(0, 0, 0, 1)';
// Find which category the user's BMI falls into to potentially color the marker
for (var i = 0; i = bmiCategories[i].min && bmiValue = bmiCategories[i].min) {
userBMIDatasetColor = bmiCategories[i].color.replace('0.6', '0.8');
userBMIDatasetBorderColor = bmiCategories[i].color.replace('0.6', '1');
break;
} else if (bmiValue >= bmiCategories[i].min && bmiValue < bmiCategories[i].max) {
userBMIDatasetColor = bmiCategories[i].color.replace('0.6', '0.8');
userBMIDatasetBorderColor = bmiCategories[i].color.replace('0.6', '1');
break;
}
}
}
// Position the user's BMI marker. This is tricky with simple bars.
// A scatter plot or a line plot might be better, but we're limited to basic chart types.
// Let's try to draw a pointer or a different dataset type.
// For now, let's use a point on the last category bar if it's within bounds.
// This requires custom drawing or a more complex chart setup.
// Simpler approach for visualization: show the ranges as stacked bars, and then overlay a point for the user's BMI.
// This needs separate datasets.
// Let's use a combination approach:
// Dataset 1: The ranges (as background bars)
// Dataset 2: A single point for user's BMI, placed correctly on the scale.
// This requires careful positioning.
// Let's simplify: make the bar chart represent the ranges accurately, and then add a point annotation if possible.
// Native canvas drawing requires more JS. Let's stick to Chart.js basic functionality with some workarounds.
// Simulating a pointer: Add a dataset of points.
// The challenge is mapping the X-axis position correctly.
// If we have 6 categories, the middle of the first is at X=0, middle of second at X=1, etc.
// We need to know which category the user's BMI falls into.
var categoryIndex = -1;
for (var i = 0; i = bmiCategories[i].min && bmiValue <= bmiCategories[i].max) {
categoryIndex = i;
break;
}
}
if (categoryIndex !== -1) {
// The position needs to be relative to the start of the chart's X-axis.
// If we have 6 bars, each bar is roughly at index 0, 1, 2, 3, 4, 5.
// The center of the bar for categoryIndex would be `categoryIndex`.
// We need to account for chart padding and scale.
// For simplicity, let's add a point dataset that *tries* to align.
// Let's add a dataset of 'scatter' or 'line' points.
// This is getting complex without a library.
// A better native approach for visualization: just draw the ranges and overlay a marker using direct canvas drawing API if needed.
// Given the constraint of "pure SVG or native ", let's try a simpler chart.
// Let's re-focus on a clear bar chart of the *ranges*.
// The current `chartDataValues` represents the width of each range.
// We can add a second dataset for a pointer.
var pointerData = [];
var pointerXPosition = -1; // Will be calculated
var pointerYPosition = bmiValue; // The actual BMI value
// Try to place the pointer within the correct category band on the X-axis
// This requires understanding how chart.js maps data indices to X-axis positions.
// For a simple bar chart, index `i` corresponds to the i-th bar.
// We can place a single point at the index corresponding to the user's category.
if (categoryIndex !== -1) {
pointerData.push({x: categoryIndex, y: bmiValue});
}
}
data.datasets.push({
type: 'scatter', // Use scatter plot for a point
label: userBMIDatasetLabel,
data: pointerData,
backgroundColor: userBMIDatasetColor,
borderColor: userBMIDatasetBorderColor,
pointRadius: 8,
pointHoverRadius: 10,
showLine: false // Don't draw a line connecting points if multiple
});
}
// Adjust scales to accommodate BMI values
var maxYAxisValue = Math.max(chartMaxY, bmiValue * 1.1 || chartMaxY); // Ensure BMI value is visible
var yAxisConfig = {
beginAtZero: true,
title: {
display: true,
text: 'BMI Value (kg/m²)'
},
suggestedMax: maxYAxisValue // Dynamically set max based on user BMI
};
data.datasets[0].data = chartDataValues; // Update the range widths
data.datasets[0].backgroundColor = chartBackgroundColors;
data.datasets[0].borderColor = chartBorderColors;
var bmiChart = new Chart(ctx, {
type: 'bar',
data: data,
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: yAxisConfig,
x: {
grid: { display: false }
}
},
plugins: {
legend: { display: false },
tooltip: {
enabled: true,
callbacks: {
title: function(tooltipItems) {
if (tooltipItems.length > 0) {
var index = tooltipItems[0].dataIndex;
return bmiCategories[index].name;
}
return ";
},
label: function(context) {
var index = context.dataIndex;
var category = bmiCategories[index];
var value = context.parsed.y;
if (value === Infinity) value = '> 40'; // Handle Infinity case
if (context.dataset.label === 'Your BMI') {
return 'Your BMI: ' + bmiValue.toFixed(1);
}
if (category.max === Infinity) {
return category.name + ': ' + category.min.toFixed(1) + '+';
} else if (category.min === 0) {
return category.name + ': < ' + category.max.toFixed(1);
}
return category.name + ': ' + category.min.toFixed(1) + ' – ' + category.max.toFixed(1);
}
}
}
}
}
});
bmiChartInstance = bmiChart; // Store the instance
}
function validateInput(value, errorElement, inputName, minValue, maxValue) {
var errors = [];
if (value === null || value === "") {
errors.push(inputName + " is required.");
} else {
var numValue = parseFloat(value);
if (isNaN(numValue)) {
errors.push("Please enter a valid number.");
} else {
if (minValue !== undefined && numValue maxValue) {
errors.push(inputName + " cannot be greater than " + maxValue + ".");
}
}
}
errorElement.textContent = errors.join(" ");
return errors.length === 0;
}
function calculateBMI() {
var weight = parseFloat(weightInput.value);
var heightCm = parseFloat(heightInput.value);
var isValid = true;
// Clear previous errors
weightError.textContent = "";
heightError.textContent = "";
// Validation
if (isNaN(weight) || weight <= 0) {
weightError.textContent = "Please enter a valid weight in kg.";
isValid = false;
}
if (isNaN(heightCm) || heightCm 500) { // Extremely high weight unlikely for adult
weightError.textContent = "Weight seems unusually high. Please check.";
isValid = false;
}
if (heightCm > 272) { // Extremely high height unlikely for adult (KBS is around 2.5m)
heightError.textContent = "Height seems unusually high. Please check.";
isValid = false;
}
if (!isValid) {
resultsContainer.style.display = 'none';
return;
}
// Calculations
var heightM = heightCm / 100;
var bmi = weight / (heightM * heightM);
var bmiRounded = bmi.toFixed(1);
var weightCategoryText = "";
var idealWeightMin = 0;
var idealWeightMax = 0;
// Determine weight category and ideal weight range
if (bmi = 18.5 && bmi = 25.0 && bmi = 30.0 && bmi = 35.0 && bmi = 40.0
weightCategoryText = "Obesity (Class III)";
idealWeightMin = 18.5 * (heightM * heightM);
idealWeightMax = 24.9 * (heightM * heightM);
}
mainResult.textContent = bmiRounded;
currentBMI.textContent = bmiRounded + " kg/m²";
weightCategory.textContent = weightCategoryText;
idealWeightRange.textContent = idealWeightMin.toFixed(1) + " kg – " + idealWeightMax.toFixed(1) + " kg";
resultsContainer.style.display = 'block';
// Update chart with the calculated BMI
updateChart(bmi);
}
function resetCalculator() {
weightInput.value = "";
heightInput.value = "";
weightError.textContent = "";
heightError.textContent = "";
resultsContainer.style.display = 'none';
mainResult.textContent = "–";
weightCategory.textContent = "–";
currentBMI.textContent = "–";
idealWeightRange.textContent = "–";
// Clear and reset chart
if (bmiChartInstance) {
bmiChartInstance.destroy();
bmiChartInstance = null;
}
// Optionally reset chart to default empty state or specific initial view
var ctx = bmiChartCanvas.getContext('2d');
ctx.clearRect(0, 0, bmiChartCanvas.width, bmiChartCanvas.height);
// We can re-initialize with default/empty data if needed, but clearing is sufficient.
}
function copyResults() {
var bmi = document.getElementById('mainResult').textContent;
var category = document.getElementById('weightCategory').textContent;
var idealRange = document.getElementById('idealWeightRange').textContent;
var currentBmiValue = document.getElementById('currentBMI').textContent;
if (bmi === "–") {
alert("No results to copy yet. Please calculate your BMI first.");
return;
}
var textToCopy = "— BMI Calculation Results —\n\n";
textToCopy += "Your BMI: " + bmi + " kg/m²\n";
textToCopy += "Weight Category: " + category + "\n";
textToCopy += "Ideal Weight Range: " + idealRange + "\n";
textToCopy += "Current BMI Reading: " + currentBmiValue + "\n\n";
textToCopy += "——————————-\n";
textToCopy += "Calculated using: Weight (kg) / (Height (m))^2";
navigator.clipboard.writeText(textToCopy).then(function() {
// Display a temporary success message
var copyButton = document.querySelector('.btn-copy');
var originalText = copyButton.textContent;
copyButton.textContent = 'Copied!';
copyButton.style.backgroundColor = 'var(–primary-color)'; // Change color to indicate success
setTimeout(function() {
copyButton.textContent = originalText;
copyButton.style.backgroundColor = 'var(–success-color)'; // Revert color
}, 2000);
}).catch(function(err) {
alert("Failed to copy results. Please copy manually.");
console.error('Copying failed: ', err);
});
}
// Add event listeners for real-time updates (optional, but good practice)
weightInput.addEventListener('input', function() {
if (resultsContainer.style.display === 'block') {
// Only auto-calculate if results are already visible and inputs change
// This prevents instant calculation before user is done typing, but allows updates
// If you want instant updates for all changes, remove this if condition.
calculateBMI();
}
});
heightInput.addEventListener('input', function() {
if (resultsContainer.style.display === 'block') {
calculateBMI();
}
});
// Initial setup: Ensure chart is drawn correctly on load if needed, or wait for calculation.
// For this calculator, we wait for the user to click 'Calculate'.
// However, we need to ensure Chart.js is loaded. It's assumed to be available globally.
// A small delay might be needed for canvas to be fully rendered before chart is initialized,
// though typically not an issue when done after DOM content loaded.
// Ensure chart is rendered correctly when the page loads
window.onload = function() {
// Initially update chart with placeholder values or default state
updateChart(0); // Pass 0 or null to show a blank state initially
// Reset button should also clear the canvas visually
document.querySelector('.btn-reset').onclick(); // Trigger reset to clear canvas and hide results
};