BMI & Waist Circumference Calculator
body {
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color: #333;
line-height: 1.6;
margin: 0;
padding: 20px;
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.loan-calc-container {
max-width: 700px;
margin: 40px auto;
background-color: #ffffff;
padding: 30px;
border-radius: 8px;
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h1, h2 {
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text-align: center;
margin-bottom: 20px;
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.input-group {
margin-bottom: 20px;
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align-items: center;
gap: 15px;
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.input-group label {
flex: 1;
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font-weight: 600;
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.input-group input {
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button {
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padding: 12px 20px;
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transition: background-color 0.3s ease;
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button:hover {
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#result {
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#result h3 {
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#bmi-value {
font-size: 2.5rem;
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color: #004a99;
display: block;
margin-bottom: 10px;
}
#waist-to-height-ratio {
font-size: 1.5rem;
font-weight: bold;
color: #004a99;
display: block;
margin-bottom: 10px;
}
.health-risk {
font-size: 1.2rem;
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margin-top: 15px;
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.health-risk.low { color: #28a745; }
.health-risk.moderate { color: #ffc107; }
.health-risk.high { color: #dc3545; }
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BMI & Waist Circumference Calculator
Understanding BMI and Waist Circumference
Body Mass Index (BMI) and waist circumference are two fundamental metrics used to assess an individual's body composition and potential health risks. While BMI provides a general overview of weight relative to height, waist circumference offers insights into abdominal fat, which is strongly linked to cardiovascular disease and metabolic disorders. This calculator helps you determine these values and understand their implications for your health.
What is BMI?
BMI is a measure of body fat based on an individual's weight and height. It's a widely used screening tool, though it doesn't directly measure body fat or distinguish between muscle and fat.
BMI = (Weight in Kilograms) / (Height in Meters)²
For example, if a person weighs 70 kg and is 1.75 meters tall, their BMI would be: 70 / (1.75 * 1.75) = 22.86.
What is Waist Circumference?
Waist circumference measures the distance around your waist at a specific point, typically at the level of the navel. It's a key indicator of abdominal obesity, also known as visceral fat. Excess visceral fat is metabolically active and can increase the risk of conditions like type 2 diabetes, high blood pressure, heart disease, and certain cancers.
Waist-to-Height Ratio (WtHR)
The Waist-to-Height Ratio (WtHR) is a simple yet powerful indicator of central obesity and associated health risks. It's calculated by dividing your waist circumference by your height. A WtHR of 0.5 or less is generally considered healthy.
Waist-to-Height Ratio = Waist Circumference (cm) / Height (cm)
For instance, with a waist of 85 cm and a height of 175 cm, the WtHR would be: 85 / 175 = 0.49.
Interpreting Your Results
BMI Categories:
- Below 18.5: Underweight
- 18.5 – 24.9: Normal weight
- 25.0 – 29.9: Overweight
- 30.0 and above: Obesity
Waist Circumference Health Risks (General Guidelines for Adults):
- Women: Over 80 cm (31.5 inches) may indicate increased risk. Over 88 cm (35 inches) indicates substantially increased risk.
- Men: Over 94 cm (37 inches) may indicate increased risk. Over 102 cm (40 inches) indicates substantially increased risk.
Waist-to-Height Ratio (WtHR) Risk Assessment:
- WtHR ≤ 0.5: Healthy weight distribution, lower health risk.
- WtHR > 0.5: Increased health risk.
This calculator provides an estimate. For personalized health advice, always consult with a healthcare professional.
function calculateBmiAndWaist() {
var weightInput = document.getElementById("weight");
var heightInput = document.getElementById("height");
var waistInput = document.getElementById("waist");
var weight = parseFloat(weightInput.value);
var heightCm = parseFloat(heightInput.value);
var waistCm = parseFloat(waistInput.value);
var bmiValueElement = document.getElementById("bmi-value");
var wthrElement = document.getElementById("waist-to-height-ratio");
var healthRiskElement = document.getElementById("health-risk-assessment");
var resultTitle = document.getElementById("result-title");
// Clear previous results
bmiValueElement.textContent = "–";
wthrElement.textContent = "–";
healthRiskElement.innerHTML = "";
resultTitle.textContent = "Your Health Metrics";
// Input validation
if (isNaN(weight) || isNaN(heightCm) || isNaN(waistCm) || weight <= 0 || heightCm <= 0 || waistCm <= 0) {
healthRiskElement.innerHTML = 'Please enter valid positive numbers for all fields.';
return;
}
// BMI Calculation
var heightM = heightCm / 100;
var bmi = weight / (heightM * heightM);
var formattedBmi = bmi.toFixed(1);
// Waist-to-Height Ratio Calculation
var wthr = waistCm / heightCm;
var formattedWthr = wthr.toFixed(2);
bmiValueElement.textContent = formattedBmi;
wthrElement.textContent = "WtHR: " + formattedWthr;
// Health Risk Assessment
var bmiRisk = "";
if (bmi = 18.5 && bmi = 25.0 && bmi <= 29.9) {
bmiRisk = "Overweight";
} else {
bmiRisk = "Obese";
}
var wthrRisk = "";
var wthrClass = "";
if (wthr 88) {
genderSpecificRisk = "Substantially increased risk for women.";
genderSpecificClass = "high";
} else if (gender && gender.value === 'female' && waistCm > 80) {
genderSpecificRisk = "Increased risk for women.";
genderSpecificClass = "moderate";
} else if (gender && gender.value === 'male' && waistCm > 102) {
genderSpecificRisk = "Substantially increased risk for men.";
genderSpecificClass = "high";
} else if (gender && gender.value === 'male' && waistCm > 94) {
genderSpecificRisk = "Increased risk for men.";
genderSpecificClass = "moderate";
} else if (gender) {
genderSpecificRisk = "Waist circumference within healthy range.";
genderSpecificClass = "low";
}
healthRiskElement.innerHTML =
'
BMI Category: ' + bmiRisk + " +
'
Waist-to-Height Ratio: ' + formattedWthr + " +
'
Waist Circumference Risk: ' + wthrRisk + " +
(genderSpecificRisk ? '
Gender-Specific Risk: ' + genderSpecificRisk + " : ");
}