Health & Fitness Calculators

Tools to help you understand your sleep, fitness, and wellbeing.

Calculate your Body Mass Index and weight category.

Calculate BMI-for-age percentile for children and teens ages 2-19, using CDC growth charts.

Estimate your body fat percentage using the U.S. Navy circumference method.

Compare your ideal weight across the Devine, Robinson, Miller, and Hamwi formulas.

Find your accurate bra size using the 6-measurement method, with sister sizes and international conversions.

Calculate your BMR, TDEE, and daily macros for cutting, maintaining, or bulking.

Calculate your Basal Metabolic Rate with Mifflin-St Jeor, plus Harris-Benedict and Katch-McArdle for comparison.

Find how many calories to eat per day to lose, maintain, or gain weight, based on your BMR, TDEE, and goal.

Turn a daily calorie target into grams of protein, carbs, and fat, with balanced, USDA-aligned, or custom splits.

Calculate pace, time, distance, and speed in min/km or min/mile, with a Riegel race-time predictor.

Find your training heart-rate zones using the AHA %HRmax method or the Karvonen heart rate reserve method.

Find your ideal bedtime or wake-up time based on 90-minute sleep cycles.

Estimate your due date and key pregnancy milestones from your last period or conception date.