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BMR Calculator

Enter sex, age, height, weight, activity level, and formula preference to estimate BMR, maintenance calories, and simple cut or gain targets.

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If BMR is new, read it this way

BMR means basal metabolic rate: the energy your body uses for breathing, heartbeat, temperature, and basic functions even at complete rest.

Use BMR as the baseline, then look at maintenance calories when planning daily intake.

BMR

Baseline calories needed at rest

Maintenance calories

BMR plus movement, work, and exercise for a daily estimate

BMR

1,669 kcal

Baseline calories needed at rest

Maintenance calories

2,587 kcal

Moderately active · x 1.55

Cut target

2,187 kcal

About 400 kcal below maintenance

Gain target

2,837 kcal

About 250 kcal above maintenance

Current input summary · Male · 30 · 72 kg · 175 cm · Calculation basis: 72 kg / 175 cm

Quick examples

1. Body details

Formula

If unsure, start with Mifflin-St Jeor, a commonly used modern estimate.

Recommended

Current input summary

Male · 30 · 72 kg · 175 cm

Calculation basis: 72 kg / 175 cm

A commonly used modern estimate for general adults.

2. Activity level

Pick the pattern closest to your usual week.

3. Read the result

BMR

1,669 kcal

Baseline calories needed at rest

Maintenance calories

2,587 kcal

Moderately active · x 1.55

Calories added by activity

918 kcal

Activity added

Baseline 1,669 kcalActivity added 918 kcal

Daily intake reference

These are planning references, not clinical prescriptions. Use professional guidance for medical, pregnancy, growth, or eating-disorder concerns.

Cut target

2,187 kcal

About 400 kcal below maintenance

Maintenance calories

2,587 kcal

Estimated intake to maintain this activity level

Gain target

2,837 kcal

About 250 kcal above maintenance

BMR and maintenance calories are estimates. Adjust with real weight trends, sleep, stress, and training intensity.

Health use notice

This tool is for general reference only and does not replace medical, nutrition, diagnostic, or treatment advice. For health decisions, confirm the result with a clinician, registered specialist, or official guidance.

How it works

BMR is the minimum energy your body uses at rest. The calculator multiplies BMR by an activity factor to estimate maintenance calories, then shows simple cut and gain references.

Usage notes

  • Choose either the Mifflin-St Jeor or Harris-Benedict formula.
  • Maintenance calories = BMR × activity factor.
  • Cut and gain targets adjust maintenance calories by a simple planning range.

Frequently asked questions

What is the difference between BMR and maintenance calories?expand_more

BMR is your resting baseline. Maintenance calories add your daily activity on top of that baseline.

Which activity level should I choose?expand_more

Pick the level that best matches both your workout frequency and your everyday movement.

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