Health & Fitness Calculators

Calculate Body Mass Index and see your WHO weight category from height and weight in either metric (cm, kg) or imperial (ft/in, lb) units instantly.

Estimate the calories your body burns at rest using the Mifflin-St Jeor equation from age, sex, height, and weight — the baseline for any calorie plan.

Estimate daily calorie needs (TDEE) for weight loss, maintenance, or gain from age, sex, height, weight, and activity level using the Mifflin-St Jeor formula.

Estimate body fat percentage using the US Navy tape method from neck, waist, and hip circumferences along with height, then compare against fitness categories.

Compute ideal body weight for men and women from height using the Devine, Robinson, Miller, and Hamwi formulas so you can compare classical medical benchmarks.

Estimate your pregnancy due date, current gestational age, and trimester milestones from the first day of your last menstrual period using Naegele's rule.

Calculate running pace, finish time, or distance for 5K, 10K, half marathon, or marathon workouts from any two of pace, time, and distance in km or miles.

Compute daily protein, carbohydrate, and fat targets in grams and calories from a TDEE, goal split, and body weight — tune macros for cutting or bulking.

Estimate daily water intake needs in ounces and liters from body weight, activity level, and climate to stay properly hydrated throughout the day.

Compute all five training heart rate zones from age and resting heart rate using the Karvonen formula, ideal for endurance, tempo, and interval sessions.