Calculate Katch-McArdle BMR, TDEE, target calories and daily macros from weight, body fat percentage, activity level and fitness goal.

Educational adult estimates. BMR, activity and macro settings are approximations, not a diet prescription. Clinical guidance is needed for pregnancy, under-18s or relevant health conditions.

Common heuristic multipliers; select the assumption matching your activity.

Save on this device

Other scripts on this site can access saved values. Expired data clears on your next visit; Reset clears it now.

Disclaimer: This calculator provides educational estimates for adults and is not medical advice. Avoid very low-calorie diets unless medically supervised, and consult a clinician/dietitian if you’re under 18, pregnant/breastfeeding, have diabetes/kidney/liver disease, a history of eating disorders, or take medications that affect weight or appetite. For general guidance, check public health resources (e.g., CDC/NIH).

Katch-McArdle Formula

The following is the equation described by the Katch-McArdle formula.

BMR (kcal/day) = 370 + 21.6 × Lean body mass (kg).

  • Where BMR is your basal metabolic rate
  • LBM is your lean body mass in kilograms

Katch-McArdle Definition

The Katch-McArdle equation estimates basal/resting metabolic rate (an approximation of the calories your body uses at rest throughout the day) based on lean body mass.

FAQ

What is the Katch-McArdle formula?

This equation is a formula that was created for calculating a BMR, or basal metabolic rate.

What is BMR?

BMR is the rate at which a human body burns calories while at rest, i.e. not related to exercise.