What is Basal Metabolic Rate (BMR)?

BMR represents the energy expended by your body to maintain basic life-sustaining vegetative functions (breathing, circulating blood, cellular division, temperature regulation) at rest.

How is BMR different from TDEE?

BMR is what your body burns with zero activity (resting in bed). TDEE (Total Daily Energy Expenditure) scales your BMR to account for physical activity and exercise.

Can I increase my BMR?

Yes, primarily by building lean skeletal muscle tissue. Muscle is metabolically active and burns more calories at rest than adipose fat tissue.

Health Tool✨ New Release

BMR Calculator

Calculate your Basal Metabolic Rate (BMR) using Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas. BMR is the baseline number of calories your body burns at rest to survive.

Interactive BMR Calculator Workspace

Live Solver

Age (Years)

Weight (kg)

Height (cm)

Body Fat Percentage (%) (Optional - for Katch-McArdle)

Basal Metabolic Expenditures

Mifflin-St Jeor (Standard)1679 kcalRecommended baseline

Harris-Benedict (Revised)1734 kcalTraditional formula

Katch-McArdle (LBM)N/AEnter body fat above

Mathematical Formula & Variables

Equation ModelBMR (Male) = 10 * weight_kg + 6.25 * height_cm - 5 * age + 5

The Mifflin-St Jeor equation computes resting metabolic expenditure based on physiological sex, age, weight, and vertical height.

Variable Definitions

Symbol	Description
BMR	Basal Metabolic Rate in kcal/day
weight_kg	Weight in kilograms
height_cm	Height in centimeters
age	Age in years

How to Use the BMR Calculator

Choose Metric (kg/cm) or Imperial (lbs/in) units.
Select your physiological sex.
Input your age, weight, and height.
Optionally input your body fat percentage to see the Katch-McArdle calculation.
Click calculate to see your BMR from the top metabolic formulas.

Practical Example Calculation

Scenario Context: Calculating the BMR of a 30-year-old male who stands 180 cm tall and weighs 80 kg.

Step 1: Multiply weight in kg by 10: 80 * 10 = 800.

Step 2: Multiply height in cm by 6.25: 180 * 6.25 = 1,125.

Step 3: Multiply age in years by 5: 30 * 5 = 150.

Step 4: Apply Male constant (+5): 800 + 1,125 - 150 + 5 = 1,780.

The Mifflin-St Jeor BMR is 1,780 kcal per day.

Frequently Asked Questions

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