// multi-utility computation suite · offline · instant · precise
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health.basal-metabolic-rate-katch Calculator
Calculates BMR using the Katch-McArdle formula (370 + 21.6 × lean body mass) — more accurate than weight-based formulas for people who know their body fat percentage. Katch-McArdle is the most accurate BMR formula for lean individuals because fat mass has minimal metabolic activity.
Inputs
Lean Body Mass Kg
Total mass of the body. Used with height to calculate BMI and estimate lean mass.
Activity Multiplier
Reference formula or conversion factor shown for context.
Results
BMR (Katch-McArdle) kcal/day
The value at the specified point or condition.
TDEE (total daily energy expenditure)
Your calorie maintenance level — the daily intake needed to hold current weight. Eat below this to lose weight; above to gain.
lean body mass
Body weight minus fat mass — muscle, bone, organs, and water. More useful than total weight for fitness assessments and medication dosing.
BMR = 370 + 21.6 × LBM
Reference formula or conversion factor shown for context.
vs Mifflin-St Jeor
Sample size or count used in the calculation.
activity factor
Rate of radioactive decay events per second (becquerels or curies). Decreases exponentially with time.