Health & Fitness Calculators
6 free calculators · runs in your browser · nothing you type is stored
Body measurements, maintenance calories, a sensible calorie target, a rough idea of body fat or daily water: these calculators turn a handful of measurements into numbers you can use to plan, and explain the formula behind each one so you know what the figure does and doesn't mean.
They are population-level estimates. They can't see your health history, your muscle mass or your medication, and they are not a substitute for advice from a doctor or dietitian. Height, weight and other personal measurements are never put in the page address or stored.
All Health & Fitness calculators
BMI CalculatorBody mass index from your height and weight, with its category.BMR & TDEE CalculatorEstimate your basal metabolic rate and daily maintenance calories.Calorie Goal CalculatorTurn your maintenance calories into a daily target with a modest deficit or surplus.Body Fat CalculatorEstimate body fat percentage from tape measurements with the US Navy method.Water Intake CalculatorA rule-of-thumb estimate of daily fluid from weight, exercise and climate.Ideal Weight CalculatorCompare the Devine, Robinson and Hamwi ideal body weight formulas for your height.
Which calculator do I need?
Start from the job you are trying to do.
- Check body mass index and its categoryBMI
- Estimate the calories you burn in a dayBMR & TDEE
- Turn maintenance calories into a daily targetCalorie Goal
- Estimate body fat from tape measurementsBody Fat
- Compare ideal-weight formulas for your heightIdeal Weight
- Get a rule-of-thumb daily water figureWater Intake