Resting Metabolic Rate (RMR) Calculator
Resting Metabolic Rate (RMR) is the number of calories your body needs to perform basic life-sustaining functions at rest. These functions include breathing, circulation, cell production, and temperature regulation. Understanding your RMR can be a crucial part of managing your weight and optimizing your diet and exercise plan.
There are several formulas to estimate RMR. The most common ones are the Harris-Benedict Equation and the Mifflin-St Jeor Equation. The Mifflin-St Jeor equation is generally considered more accurate for most people. We will use the Mifflin-St Jeor equation here.
Gender:
Male
Female
Weight (kg):
Height (cm):
Age (years):
Calculate RMR
function calculateRMR() {
var gender = document.getElementById("gender").value;
var weightKg = parseFloat(document.getElementById("weightKg").value);
var heightCm = parseFloat(document.getElementById("heightCm").value);
var age = parseFloat(document.getElementById("age").value);
var rmr = 0;
// Validate inputs
if (isNaN(weightKg) || weightKg <= 0 ||
isNaN(heightCm) || heightCm <= 0 ||
isNaN(age) || age <= 0) {
document.getElementById("rmrResult").innerHTML = "Please enter valid positive numbers for weight, height, and age.";
return;
}
// Mifflin-St Jeor Equation
if (gender === "male") {
rmr = (10 * weightKg) + (6.25 * heightCm) – (5 * age) + 5;
} else { // female
rmr = (10 * weightKg) + (6.25 * heightCm) – (5 * age) – 161;
}
// Display the result
document.getElementById("rmrResult").innerHTML = "Your estimated Resting Metabolic Rate (RMR) is:
" + rmr.toFixed(2) + " calories per day .";
}
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