Enter your weight and body fat percentage into the calculator to determine your BMR using the Katch-McArdle equation.

Katch-McArdle Calculator

Katch: BMR/TDEE & Macros
US Navy Body Fat
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Enter weight and body fat % to estimate BMR, TDEE, and macros.

BMR: — kcal/day
Lean Body Mass: — kg (— lb)
TDEE: — kcal/day
Target Calories: — kcal/day
Macros (per day):
Protein
— g
Fat
— g
Carbs
— g

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 = 370 + (21.6 × LBM)
  • Where BMR is your basal metabolic rate
  • LBM is your lean body mass

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.