BMI, ideal weight, BMR, TDEE, and body measurement calculators. Browse our free body metrics tools below — all calculators are instant, accurate, and require no sign-up.
Adjusted Body Weight Calculator — Calculate adjusted body weight (AjBW) for obese patients using the Devine ideal body weight formula and a 0.4 correction factor for clinical dosing.
Ape Index Calculator — Calculate your ape index (arm span to height ratio) and discover how your wingspan affects performance in climbing, swimming, and combat sports.
BMI Calculator — Calculate your Body Mass Index (BMI), see your WHO weight category, healthy weight range for your height, and understand what your BMI means for your health.
BMI Prime Calculator — Free BMI Prime calculator. Calculate your BMI Prime ratio — a normalized version of BMI where 1.0 is the upper limit of normal weight — for a clearer picture of your weight status.
BMR Calculator — Harris-Benedict Equation — Calculate your Basal Metabolic Rate using the revised Harris-Benedict equation (1984). Estimate daily calorie needs at rest for weight management and nutrition planning.
BMR Calculator — Cunningham Equation — Calculate your Basal Metabolic Rate using the Cunningham equation, preferred for athletes and highly active individuals. Uses lean body mass for accurate TDEE estimation.
BMR Calculator — Katch-McArdle Formula — Calculate your Basal Metabolic Rate with the Katch-McArdle formula using lean body mass. Ideal for individuals who know their body fat percentage. Includes TDEE estimates.
BMR Calculator — Mifflin-St Jeor Equation — Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation, considered the most accurate BMR formula for the general population. Get TDEE estimates for all activity levels.
Healthy Weight Range Calculator — Find your healthy weight range based on BMI guidelines (18.5–24.9). Enter your height to see your ideal weight range and current BMI status.
Ideal Body Weight Calculator (Devine Formula) — Calculate your ideal body weight using the Devine formula — the most commonly used IBW calculation in clinical medicine for drug dosing, nutrition planning, and tidal volume estimation.
Ideal Body Weight Calculator (Hamwi Formula) — Calculate your ideal body weight using the Hamwi formula (1964). The oldest major IBW equation, widely used in clinical dietetics with the highest per-inch weight increment.
Ideal Body Weight Calculator (Miller Formula) — Calculate your ideal body weight using the Miller formula (1983). Gives the highest IBW estimates among the four major formulas — a more generous reference weight for your height.
Ideal Body Weight Calculator (Robinson Formula) — Calculate your ideal body weight using the Robinson formula (1983). A refined clinical IBW equation that gives slightly higher estimates than Devine for most heights.
Overweight & Underweight Threshold Calculator — Find the exact body weights where you cross BMI boundaries of 18.5, 25, and 30 for your height. See your healthy weight range instantly.
TDEE Calculator — Total Daily Energy Expenditure — Calculate your Total Daily Energy Expenditure (TDEE) using four BMR formulas. Get personalized calorie targets for weight loss, maintenance, and muscle gain based on your activity level.
Waist-to-Hip Ratio Calculator — Calculate your waist-to-hip ratio (WHR) to assess health risk. Uses WHO thresholds for cardiovascular disease, diabetes, and abdominal obesity classification.
Waist-to-Height Ratio Calculator — Calculate your waist-to-height ratio (WHtR) for cardiovascular risk screening. The keep-it-under-0.5 rule is a simple, powerful health indicator.