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Metabolism

BMR Calculator

Estimate your Basal Metabolic Rate to understand calories burned at rest.

A foundational number for calorie planning.

metabolismcaloriesnutrition planning

Calculator inputs

BMR Calculator

kg
cm
years

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Fill in the fields on the left to get your estimate.

About this calculator

Why BMR matters

The BMR Calculator estimates how many calories your body uses at rest to support essential functions like breathing, circulation, and cell repair. It gives you a baseline energy reference before activity is added.

Many people use BMR to build nutrition plans, estimate maintenance needs, or set calorie targets for body composition goals. It can also help explain why calorie needs vary from person to person.

Because BMR is an estimate, your true energy needs may differ based on sleep, stress, lean mass, medications, and daily routine. Use it as a planning anchor and adjust with real-world feedback.

Method overview

How this calculation works

BMR estimates calories your body uses at rest for basic functions like breathing and circulation.

Educational guide

Understand and use this calculator with confidence

What this calculator does

Estimate your Basal Metabolic Rate to understand calories burned at rest.

How the estimate works

BMR is resting energy only. Daily needs are higher after accounting for movement and exercise.

What your result means

The BMR Calculator estimates how many calories your body uses at rest to support essential functions like breathing, circulation, and cell repair. It gives you a baseline energy reference before activity is added. Many people use BMR to build nutrition plans, estimate maintenance needs, or set calorie targets for body composition goals. It can also help explain why calorie needs vary from person to person. Because BMR is an estimate, your true energy needs may differ based on sleep, stress, lean mass, medications, and daily routine. Use it as a planning anchor and adjust with real-world feedback.

Limitations to keep in mind

Results are estimates and should be adapted based on real-world progress.

Tips for responsible use

  • Use your result as a starting point, then review how your body responds over time.
  • Track trends under similar conditions instead of focusing on a single reading.
  • Combine this estimate with lifestyle context like sleep, activity, stress, and nutrition quality.
  • The Mifflin-St Jeor equation: 10 × weight (kg) + 6.25 × height (cm) − 5 × age, plus 5 for males or minus 161 for females. It is one of the most widely validated BMR formulas available.

Explanation

How to think about this result

BMR estimates how many calories your body needs for essential functions at rest. It is commonly used to set nutrition targets.

Learn more

Educational context

BMR vs daily calories

BMR is resting energy only. Daily needs are higher after accounting for movement and exercise.

FAQ

Common questions about the BMR Calculator

What formula does this calculator use?
The Mifflin-St Jeor equation: 10 × weight (kg) + 6.25 × height (cm) − 5 × age, plus 5 for males or minus 161 for females. It is one of the most widely validated BMR formulas available.
Is BMR the same as TDEE?
No. BMR is resting energy only — the calories your body needs for basic functions at complete rest. TDEE multiplies BMR by an activity factor to estimate total daily calorie needs. Always use TDEE for practical nutrition planning.
What affects BMR?
Age, biological sex, height, weight, and lean body mass all influence BMR. Muscle tissue is metabolically more active than fat tissue, so body composition plays a meaningful role beyond just scale weight.
Why does my BMR change over time?
BMR shifts naturally as weight, age, and body composition change. Recalculating after meaningful changes in any of these inputs helps keep your calorie estimates relevant and accurate.
Is my BMR the number of calories I should eat?
Not usually. BMR represents resting needs only. Most people need more calories once daily activity is factored in. Use your TDEE — not your BMR — as a practical baseline for setting calorie targets.