Use this health-related body-size or energy equation as a screening estimate when the required measurements and demographic inputs are entered accurately.

Weight (kg)

Body weight in kilograms; must be greater than zero.

Height (cm)

Height in centimetres; must be greater than zero.

Age (years)

Age in whole years between 1 and 120.

Sex

Biological sex selecting the equation coefficients.

Compute basal metabolic rate with the revised Harris-Benedict equations (Roza and Shizgal). The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Basal metabolic rate (kcal/day)

The resulting basal metabolic rate returned as a number.

• Population equations do not diagnose health or measure individual metabolism and body composition directly. Age, sex, ethnicity, muscularity, hydration, illness, medication, pregnancy, and measurement method affect interpretation.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Use trends and additional measurements rather than one number, and consult a qualified health professional when decisions involve diagnosis, treatment, or substantial weight change.

• BMR Mifflin St Jeor Calculator

  Compute basal metabolic rate with the Mifflin St Jeor equations.

• BMI Prime Calculator

  Calculate BMI prime as body mass index divided by the upper healthy limit of 25.

• Ideal Weight Devine Calculator

  Compute ideal body weight with the Devine formula from height and sex.