Metabolic Caloric Rate Calculator
Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions, such as breathing, circulation, and cell production, at rest. This calculator helps you estimate your BMR using the Mifflin-St Jeor equation, which is widely considered one of the most accurate BMR formulas. Knowing your BMR is a crucial first step in understanding your daily caloric needs for weight management and overall health.
Calculate BMR
function calculateBMR() {
var gender = document.getElementById("gender").value;
var weightKg = parseFloat(document.getElementById("weightKg").value);
var heightCm = parseFloat(document.getElementById("heightCm").value);
var ageYears = parseFloat(document.getElementById("ageYears").value);
var bmr = 0;
// Validate inputs
if (isNaN(weightKg) || weightKg <= 0) {
document.getElementById("result").innerHTML = "Please enter a valid weight in kilograms.";
return;
}
if (isNaN(heightCm) || heightCm <= 0) {
document.getElementById("result").innerHTML = "Please enter a valid height in centimeters.";
return;
}
if (isNaN(ageYears) || ageYears <= 0) {
document.getElementById("result").innerHTML = "Please enter a valid age in years.";
return;
}
// Mifflin-St Jeor Equation
if (gender === "male") {
bmr = (10 * weightKg) + (6.25 * heightCm) – (5 * ageYears) + 5;
} else { // female
bmr = (10 * weightKg) + (6.25 * heightCm) – (5 * ageYears) – 161;
}
document.getElementById("result").innerHTML = "Your estimated Basal Metabolic Rate (BMR) is: " + bmr.toFixed(2) + " calories per day.";
}
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font-family: Arial, sans-serif;
max-width: 600px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ccc;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
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.calculator-title {
text-align: center;
color: #333;
margin-bottom: 15px;
}
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margin-bottom: 20px;
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gap: 15px;
margin-bottom: 20px;
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flex-direction: column;
}
.input-group label {
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cursor: pointer;
transition: background-color 0.3s ease;
}
.calculator-button:hover {
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}
.calculator-result {
margin-top: 25px;
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font-size: 1.1em;
color: #333;
}