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Free BMR
Calculator

Free advanced BMR Calculator comparing Mifflin-St Jeor, revised Harris-Benedict and Cunningham lean-mass equations with body-fat uncertainty, measured RMR comparison, formula sensitivity, energy/power conversions and transparent equation audit.

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About Free BMR Calculator

Calculate Mifflin–St Jeor and revised Harris–Benedict side by side, add Cunningham when lean mass is available, inspect formula disagreement, compare against a measured resting metabolic rate, and convert the result into kcal/day, kJ/day, kcal/hour and watts.

Workspace options

  • Equation sex constant
  • Age
  • Weight
  • Weight unit
  • Height
  • Height unit

Available actions

  • Not available
  • Body fat %
  • Fat-free mass
  • Copy BMR report
  • Export CSV
  • Reset