BMR Calculator
Find your Basal Metabolic Rate — the calories your body burns at complete rest.
Personal Information
Basal Metabolic Rate
1649
kcal per day (at rest)
💡 What is BMR?
Your Basal Metabolic Rate (BMR) is the number of calories your body burns at rest to maintain basic functions like breathing, circulation, and cell production.
This is the minimum calorie amount you need daily. To estimate your daily calorie needs (TDEE), multiply your BMR by your activity level multiplier.
📊 Estimated Daily Calorie Needs
🔍 Factors Affecting BMR
- • Age: BMR decreases with age (roughly 2% per decade after 20)
- • Sex: Males typically have higher BMR than females
- • Muscle Mass: Muscle tissue burns more calories at rest
- • Genetics: Metabolism varies between individuals
- • Hormones: Thyroid and hormonal imbalances affect BMR
- • Fitness Level: Regular exercise can increase BMR
Mifflin-St Jeor Formula
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161
⚠️ Important Note
BMR estimates are based on the Mifflin-St Jeor formula, which is generally accurate within ±10-20%. Actual BMR varies based on muscle composition, genetics, health conditions, and medications. For precise measurements, consult a healthcare professional or use indirect calorimetry testing.
How it works
Mifflin-St Jeor Formula: Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5 Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161 Example: 30-year-old male, 70kg, 175cm BMR = (10×70) + (6.25×175) - (5×30) + 5 = 1,733 kcal per day
The BMR (Basal Metabolic Rate) calculator determines the number of calories your body burns at rest. Enter your personal information to calculate the minimum daily calorie requirement for basic bodily functions. This calculator uses the Mifflin-St Jeor formula, which is the most accurate widely-used BMR estimation method.
Why this matters
BMR is the foundation for understanding your daily calorie needs and managing weight. Knowing your BMR helps you set appropriate calorie targets for weight loss, maintenance, or muscle gain. BMR decreases with age and is affected by factors like muscle mass, genetics, and hormones.
Related calculators
TDEE Calculator
Calculate your Total Daily Energy Expenditure to know exactly how many calories to eat.
BMI Calculator
Calculate your Body Mass Index and see which healthy weight range you fall into.
Calorie Burn Calculator
Find out how many calories you burn during any activity based on your weight and duration.
Learn more
The complete guide to bmr calculator
Formulas, examples, and tips explained in plain English