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Body Metrics
Understand BMI, BMR, and other body measurements, with explanations of what each number can and cannot tell you.
8 guides available
BMI Calculator
Adult BMI from height and weight; screening limitations explained.
Calculator + Guide →BMI Calculator for Teens
Age and sex-specific BMI percentiles for ages 2-19.
Calculator + Guide →Resting Energy Estimate
Mifflin–St Jeor estimate for its original healthy adult age range.
Calculator + Guide →Historical Weight Equations
Four historical equation outputs; not personal weight targets.
Calculator + Guide →Resting Energy Estimate for Women 50–78
Female Mifflin–St Jeor resting-energy estimate, not a calorie intake target.
Calculator + Guide →Teen Nutrition Guidance
NIDDK and Canadian teen nutrition guidance; no calorie target.
Calculator + Guide →Protein Reference for Healthy Older Adults
ESPEN European population guidance; arithmetic range, not a personal prescription.
Calculator + Guide →Waist-to-Hip Ratio
Waist divided by hip circumference; measurement limits explained.
Calculator + Guide →