Health & Fitness Calculators
Science-backed health tools to track your body composition, nutrition, and fitness goals.
37 calculators
- BMICalculate BMI with body fat estimate, waist-to-hip ratio, and ethnic-specific thresholds
- CalorieWork out your daily calories with Mifflin-St Jeor: maintenance, loss and gain targets, 7-day zig-zag cycling and a full macro breakdown.
- TDEECalculate total daily energy expenditure and calorie goals
- Body Fat5 methods to estimate body fat — no calipers needed
- Pregnancy Due DateEstimate your baby's due date with 5 calculation methods and a complete milestone timeline
- MacroCalculate daily macros with dual BMR formulas, protein analysis, and 8 diet types
- Adjusted Body WeightAdjusted body weight, with the factor range and when it applies.
- BMRCalculate your BMR and daily calorie needs with 3 proven scientific formulas
- Body Surface AreaBSA by five formulas, with the disagreement between them.
- Caloric DeficitFind your ideal calorie deficit and weight loss timeline.
- Calories BurnedCalculate how many calories you burn during any exercise or daily activity
- Chinese Gender PredictorChinese gender prediction based on the lunar calendar
- Conception DateEstimate your conception date from due date, LMP, or ultrasound.
- FFMIYour fat-free mass index, normalised for height.
- hCGTrack hCG levels and calculate doubling time with visual charts and normal range comparison
- Heart Rate ZonesPersonalized training zones with multiple scientific methods
- Ideal WeightFind your ideal weight using 7 scientific formulas
- ImplantationCalculate your implantation window and best pregnancy test day.
- Intermittent FastingCalculate your fasting schedule, calories, and macros.
- KetoCalculate personalized keto diet macros with food examples and electrolytes
- Lean Body MassEstimate your lean body mass and get actionable nutrition + training plan
- Maintenance CaloriesAdvanced TDEE calculator with macros, BMI, and body composition analysis
- Menstrual CycleYour next six period dates and today's cycle day.
- One Rep MaxEstimate your 1RM with 7 formulas, warm-up calculator, and strength standards
- OvulationFind your fertile days and ovulation date.
- Pregnancy Weight GainRecommended pregnancy weight gain by pre-pregnancy BMI and week.
- ProteinCalculate protein needs with meal plans and food suggestions
- Rest DayShould you train today? Get your readiness score with HRV and heart rate data
- Running PaceCalculate pace, VDOT, training zones, heart rate zones, and race splits
- SleepFind optimal bedtime and wake-up times using sleep cycles and chronotype
- Steps to CaloriesTurn a step count into calories from your weight, height and pace.
- VO2 MaxVO2 max by four methods, read against age and sex norms.
- Waist to Hip RatioYour waist-to-hip ratio against the WHO risk thresholds.
- Waist-to-Height RatioAssess cardiometabolic risk more accurately than BMI alone
- Water IntakeCalculate your personalized daily water intake
- Weight GainPlan your weight gain with personalized calorie, macro, and body composition targets
- Weight LossPlan your weight loss with adaptive calorie and macro targets plus body composition tracking
About these calculators
Free health and fitness calculators: BMI, body fat, calorie deficit, ideal weight, macros, keto, and more. Science-backed tools with WHO standards.