Health & Fitness calculators

General-purpose fitness estimates with clear limitations.

Body Measurements

Estimates from height, weight and body measurements.

BMI CalculatorBody mass index from height and weight in metric or US units, with the WHO adult category and its limits explained.Open Body Fat CalculatorEstimate body fat percentage from height and neck, waist and hip measurements with the US Navy method.Open

Fitness & Training

Training loads and heart rate zones.

Heart Rate Zone CalculatorFive training heart rate zones from your age or measured maximum, as a % of maximum or from heart rate reserve.Open One Rep Max CalculatorEstimate your one rep max from a set of reps with the Epley and Brzycki formulas, and the weight for other rep counts.Open

Nutrition

Energy needs and calorie estimates.

BMR CalculatorBasal metabolic rate from the Mifflin-St Jeor, Harris-Benedict and Katch-McArdle equations, side by side.Open TDEE CalculatorTotal daily energy expenditure: the calories you use in a day, from your BMR and activity level.Open Calorie CalculatorDaily calories to maintain your weight, or a target with a reduction or increase you choose, with clear warnings.Open

Running & Activity

Pace, speed and distance for runners.

Pace CalculatorRunning pace and speed from distance and time, a finish time from a pace, or the distance, with even splits.Open