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BMR Calculator

Health & Body

Basal metabolic rate — Mifflin & Harris-Benedict equations

Quick Answer

BMR Calculator: Basal metabolic rate — Mifflin & Harris-Benedict equations. Men: BMR = 10W + 6.25H − 5A + 5.

BMR = calories burned at complete rest. Mifflin-St Jeor is the most accurate for the general population (ADA recommendation); Katch-McArdle is better if you know your body fat %.
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Mifflin-St Jeor BMR

1,568 kcal/day
Mifflin-St Jeor1,568 kcal
Harris-Benedict1,605 kcal
Katch-McArdleneeds body fat %
Lean body mass—

Step-by-step

  1. 1Mifflin-St Jeor (male): 10×65 + 6.25×170 − 5×30 + 5 = 1,568 kcal
  2. 2Formulas spread: Mifflin 1,568 / Harris 1,605 kcal
  3. 3Next step: multiply by activity factor (1.2–1.9) to get TDEE

Typical BMR reference (Mifflin)

ProfileBMR
M 25y 170cm 65kg1,593 kcal
M 40y 172cm 75kg1,630 kcal
F 25y 160cm 52kg1,234 kcal
F 40y 162cm 60kg1,252 kcal

💡 BMR is 60–75% of daily burn. Muscle is metabolically active: +1 kg muscle ≈ +13 kcal/day. Crash dieting below BMR triggers adaptive thermogenesis — weight rebounds faster.

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How to Use

  1. Enter body metrics: fill height, weight, age etc. as prompted by the BMR Calculator.
  2. Read value and grade: results appear instantly with an authority-based classification.
  3. Check reference tables: confirm your range and healthy targets against the tables on this page.
  4. Back-solve your goal: adjust inputs to see what it takes to reach a target.

Key Points

  • BMR Calculator is a free online health tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Basal metabolic rate — Mifflin & Harris-Benedict equations.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Mifflin-St Jeor equation

Men: BMR = 10W + 6.25H − 5A + 5
Women: BMR = 10W + 6.25H − 5A − 161
W = weight(kg), H = height(cm), A = age

FAQ

How do I use the BMR Calculator?
Open the page and fill in the input fields — results update automatically. Basal metabolic rate — Mifflin & Harris-Benedict equations.
Are the results accurate?
Results follow published international standards (WHO, ACE, IOM) and are for reference only.
Can this replace medical advice?
No. Always consult a qualified healthcare professional for health decisions.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on all devices.

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Source & Updates

Based on WHO, ACE, IOM and other published international standards. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. BMR Calculator[EB/OL]. https://www.yijiansuan.com/en/c/health/bmr

Results provided by this tool are for reference only and do not constitute professional advice.