Your Basal Metabolic Rate (BMR)
Your BMR is the number of calories your body burns at rest to maintain basic functions like breathing, circulation, and cell production. This is a crucial baseline for understanding your daily caloric needs.
Understanding Your BMR:
The Basal Metabolic Rate (BMR) is the minimum amount of energy your body needs to function while at complete rest. For women, this calculation often uses the Mifflin-St Jeor equation, which is considered one of the most accurate. The equation takes into account your weight, height, age, and sex.
The formula used here for women is:
BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) – 161
After calculating your BMR, we multiply it by an activity factor to estimate your Total Daily Energy Expenditure (TDEE). This is the total number of calories you burn in a day, including your BMR and the calories burned through physical activity and digestion.
TDEE = BMR × Activity Factor
This calculator provides an estimate. Individual metabolic rates can vary based on genetics, muscle mass, hormonal balance, and other factors. For precise nutritional and fitness guidance, consulting a healthcare professional or a registered dietitian is recommended.
var calculateBMRFemale = function() {
var weight = parseFloat(document.getElementById("weight").value);
var height = parseFloat(document.getElementById("height").value);
var age = parseFloat(document.getElementById("age").value);
var activityLevel = parseFloat(document.getElementById("activityLevel").value);
var bmrResultDiv = document.getElementById("bmrResult");
if (isNaN(weight) || isNaN(height) || isNaN(age) || weight <= 0 || height <= 0 || age <= 0) {
bmrResultDiv.innerHTML = "Please enter valid positive numbers for weight, height, and age.";
return;
}
// Mifflin-St Jeor Equation for women
var bmr = (10 * weight) + (6.25 * height) – (5 * age) – 161;
var tdee = bmr * activityLevel;
bmrResultDiv.innerHTML = "Your Basal Metabolic Rate (BMR) is approximately:
" + bmr.toFixed(2) + " calories per day";
bmrResultDiv.innerHTML += "Your estimated Total Daily Energy Expenditure (TDEE) is approximately:
" + tdee.toFixed(2) + " calories per day";
};
.bmicalculator {
font-family: Arial, sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ddd;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.bmicalculator h3, .bmicalculator h4 {
text-align: center;
color: #333;
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flex-direction: column;
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color: #333;
}