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)

Required number input.

Height (m)

Required number input.

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

BMI prime

The resulting bmi prime returned as a number.

Body mass index

The resulting body mass index 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.

• Lean Mass James Calculator

  Compute lean body mass with the James formula from weight, height, and sex.

• Ideal Weight Devine Calculator

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

• BMR Harris Benedict Calculator

  Compute basal metabolic rate with the revised Harris-Benedict equations (Roza and Shizgal).