CalcInfinityBMR Calculator
See how many calories your body burns at rest, compared across three established formulas.
What is BMR?
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest just to keep essential functions running — breathing, circulation, cell repair — before counting any activity at all. It's the foundation number used to calculate total daily calorie needs.
Worked Example — Male, 70 kg, 175 cm, 30 years
Frequently Asked Questions
Basal Metabolic Rate — the calories your body needs at complete rest, with no activity included.
Common Mistakes to Avoid
- BMR isn't your total daily calorie need. It's calories burned at complete rest only — it doesn't include any activity. For your full daily target, use the Calorie Calculator, which multiplies BMR by an activity level.
- Katch-McArdle needs an accurate body-fat percentage. A guessed or inaccurate body-fat number produces a worse Katch-McArdle estimate than just using Mifflin-St Jeor instead — only use it if you have a reliable measurement (DEXA scan, calipers).
- This isn't calibrated for children or pregnancy. All three formulas are built for typical non-pregnant adults — resting energy needs work differently during pregnancy or childhood growth.
References
- Mifflin-St Jeor equation (1990)
- Harris-Benedict equation (revised 1984)
- Katch-McArdle formula
Last reviewed July 2026
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