Calculate Total Metabolic Rate

Male Female
Sedentary (little or no exercise) Lightly active (light exercise/sports 1-3 days/week) Moderately active (moderate exercise/sports 3-5 days/week) Very active (hard exercise/sports 6-7 days a week) Extra active (very hard exercise/sports & physical job or 2x training)

Understanding Your Total Metabolic Rate (TMR)

Your Total Metabolic Rate (TMR), also known as Total Daily Energy Expenditure (TDEE), is the total number of calories your body burns in a 24-hour period. This includes all the energy used for basic bodily functions (like breathing and maintaining body temperature), physical activity, and the digestion of food. Understanding your TMR is crucial for managing your weight, whether you aim to lose, gain, or maintain it.

Basal Metabolic Rate (BMR)

Before calculating TMR, we first determine your Basal Metabolic Rate (BMR). BMR is the minimum number of calories your body needs to perform essential life-sustaining activities at rest. This is the energy expended for basic functions like breathing, circulation, cell production, and nutrient processing. The Mifflin-St Jeor equation is a widely accepted formula for estimating BMR:

  • For men: BMR = (10 * weight in kg) + (6.25 * height in cm) – (5 * age in years) + 5
  • For women: BMR = (10 * weight in kg) + (6.25 * height in cm) – (5 * age in years) – 161

Activity Level Multipliers

Once your BMR is calculated, it's multiplied by an activity factor to estimate your TMR. This factor accounts for the calories you burn through daily activities and exercise. The common activity multipliers are:

  • Sedentary: BMR x 1.2 (little or no exercise)
  • Lightly active: BMR x 1.375 (light exercise/sports 1-3 days/week)
  • Moderately active: BMR x 1.55 (moderate exercise/sports 3-5 days/week)
  • Very active: BMR x 1.725 (hard exercise/sports 6-7 days a week)
  • Extra active: BMR x 1.9 (very hard exercise/sports & physical job or 2x training)

By inputting your weight, height, age, gender, and activity level, this calculator provides an estimate of your Total Metabolic Rate, helping you understand your daily caloric needs.

function calculateMetabolicRate() { var weightKg = parseFloat(document.getElementById("weightKg").value); var heightCm = parseFloat(document.getElementById("heightCm").value); var ageYears = parseFloat(document.getElementById("ageYears").value); var gender = document.getElementById("gender").value; var activityLevel = document.getElementById("activityLevel").value; var bmr = 0; if (isNaN(weightKg) || isNaN(heightCm) || isNaN(ageYears) || weightKg <= 0 || heightCm <= 0 || ageYears <= 0) { document.getElementById("result").innerHTML = "Please enter valid positive numbers for weight, height, and age."; return; } if (gender === "male") { bmr = (10 * weightKg) + (6.25 * heightCm) – (5 * ageYears) + 5; } else { // female bmr = (10 * weightKg) + (6.25 * heightCm) – (5 * ageYears) – 161; } var activityMultiplier = 0; switch (activityLevel) { case "sedentary": activityMultiplier = 1.2; break; case "lightlyActive": activityMultiplier = 1.375; break; case "moderatelyActive": activityMultiplier = 1.55; break; case "veryActive": activityMultiplier = 1.725; break; case "extraActive": activityMultiplier = 1.9; break; default: activityMultiplier = 1.2; // Default to sedentary if something goes wrong } var tmr = bmr * activityMultiplier; document.getElementById("result").innerHTML = "

Your Estimated Total Metabolic Rate:

" + "Basal Metabolic Rate (BMR): " + bmr.toFixed(2) + " calories/day" + "Total Metabolic Rate (TMR): " + tmr.toFixed(2) + " calories/day"; } .metabolic-rate-calculator { font-family: sans-serif; max-width: 600px; margin: 20px auto; padding: 20px; border: 1px solid #ddd; border-radius: 8px; background-color: #f9f9f9; } .metabolic-rate-calculator h2, .metabolic-rate-calculator h3 { color: #333; } .calculator-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-bottom: 20px; } .calculator-inputs .input-group { display: flex; flex-direction: column; } .calculator-inputs label { margin-bottom: 5px; font-weight: bold; color: #555; } .calculator-inputs input[type="number"], .calculator-inputs select { padding: 10px; border: 1px solid #ccc; border-radius: 4px; font-size: 1rem; } .calculator-inputs button { grid-column: 1 / -1; padding: 12px 20px; background-color: #007bff; color: white; border: none; border-radius: 4px; font-size: 1.1rem; cursor: pointer; transition: background-color 0.3s ease; } .calculator-inputs button:hover { background-color: #0056b3; } #result { margin-top: 20px; padding: 15px; border: 1px solid #e0e0e0; border-radius: 4px; background-color: #fff; text-align: center; } #result h3 { margin-top: 0; color: #007bff; } .calculator-explanation { margin-top: 30px; padding-top: 20px; border-top: 1px solid #eee; font-size: 0.95rem; line-height: 1.6; color: #444; } .calculator-explanation ul { margin-left: 20px; } .calculator-explanation li { margin-bottom: 8px; }

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