BMR Calculator

Basal Metabolic Rate | Calories burned at rest | Mifflin-St Jeor Formula

Your Basal Metabolic Rate (BMR)
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calories per day at complete rest
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Sedentary
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Lightly active
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Moderately active
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Very active
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Super active
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Formula
📖 What is BMR?
BMR is the number of calories your body needs at complete rest to maintain vital functions. Multiply by activity factor to get TDEE.

📖 How to Use This BMR Calculator

1
Choose your unit system - Select Metric (cm/kg) or Imperial (ft/in/lbs).
2
Enter your measurements - Height, weight, age, and select your gender.
3
Click "Calculate BMR & TDEE" - Get your BMR and daily calorie needs for different activity levels.

📚 What is BMR (Basal Metabolic Rate)?

Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest to maintain basic vital functions like breathing, circulation, cell production, and temperature regulation. BMR accounts for approximately 60-75% of your total daily energy expenditure.

🧮 Mifflin-St Jeor BMR Formula

Men: BMR = (10 × weight kg) + (6.25 × height cm) - (5 × age) + 5
Women: BMR = (10 × weight kg) + (6.25 × height cm) - (5 × age) - 161

🏃‍♂️ TDEE Activity Multipliers

💡 How to Use BMR for Weight Management

❓ Frequently Asked Questions

What is the difference between BMR and RMR?
BMR is measured under strict conditions (complete rest, after sleep). RMR is slightly higher and measured under less strict conditions. For practical purposes, they are very similar.
Which BMR formula is most accurate?
The Mifflin-St Jeor equation is considered the most accurate for the general population.
Does muscle mass affect BMR?
Yes! Muscle tissue burns more calories at rest than fat tissue. Strength training can raise your BMR.
Why does BMR decrease with age?
As we age, we naturally lose muscle mass (sarcopenia) and our metabolic rate slows.
Can I increase my BMR?
Yes! Building muscle, eating protein, staying hydrated, and getting adequate sleep can help.