Fitness and Health Calculators
Body composition, energy needs and training targets.
34 free toolsMost used
All 34 health calculators
Anorexic BMI
Army Body Fat
BAC
BMI
BMR
Body Fat
Body Surface Area
Body Type
Bra Size
Calorie
Calories Burned
Carbohydrate
Conception
Due Date
Fat Intake
GFR
Healthy Weight
Height
Ideal Weight
Lean Body Mass
Macro
One Rep Max
Overweight
Ovulation
Pace
Period
Pregnancy
Pregnancy Conception
Pregnancy Weight Gain
Protein
Sleep
Target Heart Rate
TDEE
Weight Watcher Points
About these health calculators
Health calculators translate a couple of measurements into something you can act on: a calorie target, a training zone, a body composition estimate. They apply population-level equations to an individual, which makes them genuinely useful for tracking direction over time and unreliable as a verdict on any single day.
Where several accepted formulas exist — BMR, body fat, ideal weight — the tools show all of them rather than picking one silently, because the spread between them tells you how much confidence the number deserves. Each page explains what the measure misses as well as what it captures.