HealthUnits
Evidence-based fitness tools.
All the calculations you actually need — in one place.
Popular Tools
BMI (Body Mass Index) Calculator
Calculate your Body Mass Index from weight and height
TDEE (Total Daily Energy Expenditure) Calculator
Calculate your total daily calorie needs based on activity level
One-Rep Max Calculator
Calculate your one-rep max from weight and reps
Macro Calculator
Calculate your daily macronutrient targets
Calorie Deficit Calculator
Plan your calorie deficit for weight loss goals
VO2 Max Calculator
Calculate your maximal aerobic capacity
Browse by Category
Body
BMI, BMR, TDEE, body fat, and body composition analysis
8 toolsStrength
One-rep max, Wilks, DOTS, and powerlifting scores
6 toolsNutrition
Macros, protein intake, and calorie targets
3 toolsCardio
Heart rate zones, VO2 max, and race predictions
3 toolsAlcohol
BAC estimation and alcohol calorie tracking
2 toolsConverters
Weight plate loading and unit conversions
1 toolYour Complete Fitness Calculation Hub
HealthUnits provides free, accurate fitness calculators for body composition, strength training, nutrition planning, and cardio performance. Whether you're tracking your BMI, calculating macros for your diet, estimating your one-rep max, or planning race times, our tools deliver instant, science-based results.
All calculators are available in over 30 languages and work on any device. No sign-up required.