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Fitness & Health

BMR Calculator

Estimate basal metabolic rate and maintenance calories from body measurements.

Calculator.net reference
Inputs
Defaults are prefilled so the result is visible immediately.
in
lb
%
Results
Results update as the calculator inputs change.

BMR

1,727 kcal/day

This calculator is informational and is not medical advice.

Maintenance estimate

2,375 kcal/day

Katch-McArdle estimate

1,736 kcal/day

Lean mass

63.2 kg

Formula and Assumptions
Mifflin-St Jeor BMR, plus optional Katch-McArdle estimate when body fat is provided.

BMR estimates energy use at rest; maintenance calories multiply BMR by activity level.

Katch-McArdle is useful only when the body-fat estimate is reasonably accurate.

Reference Upgrade
Built from the Calculator.net model, with added context.

Live validation and instant result updates instead of a submit-only workflow.

Multiple decision metrics are shown together, not only the primary answer.

Formula notes and assumptions are visible on the page so the math is easier to audit.

Reference Model

Modeled after the input style and primary output on Calculator.net's BMR Calculator.

The page keeps the math in one place and exposes the assumptions beside the result.

Default inputs: age=32, sex=male, heightInches=70, weight=170, bodyFat=18, activity=1.375