Health & fitness calculators

Nutrition and training math with no account required.

BMI Calculator

Calculate Body Mass Index with WHO 6-tier classification, healthy weight range, and boundary distances.

Navy and BMI-based body fat estimation with ACE fitness classification and lean/fat mass breakdown.

MSJ, Harris-Benedict, and Katch-McArdle BMR side by side, TDEE table, goal calorie bands.

Estimated due date and gestational age from LMP, conception date, or ultrasound, with milestone timeline.

Epley, Brzycki, Lander, Lombardi, O'Connor formulas, average 1RM, 50-100% training table.

Male and female Navy formulas, ACE bands, lean and fat mass, classification spectrum, DoD max.

Solve pace, time, or distance, race presets, splits, km/mi pace, speed, Riegel projections.

35 ml per kg plus activity, climate, pregnancy, and altitude; glasses and bottle counts.

Wake-at or sleep-at modes, four cycle counts, fall-asleep delay, age-based cycle length.

Uth-Sorensen, 1.5-mile run, or YMCA step test; Poor to Superior badge by age and sex.

Calculate your Basal Metabolic Rate using Mifflin-St Jeor and Harris-Benedict equations.

Estimate daily calorie needs based on activity level, age, height, and weight goals.

Find your ideal weight range using multiple formulas: Hamwi, Devine, Robinson, Miller.

Calculate your daily protein, carb, and fat targets from your calorie goal and body stats.

Estimate your fertile window and ovulation date from your cycle length and last period.

Calculate your estimated due date and pregnancy week from last menstrual period or conception.

Find the best bedtime and wake time based on 90-minute sleep cycles for maximum restfulness.

Calculate your daily hydration needs based on weight, activity level, and climate.