Free Fitness Calculators

Calculate your Body Mass Index and see which category you fall in.

Estimate body fat percentage using the US Navy tape-measurement method.

Calculate the weight of your muscle, bone, and organs — everything except fat.

Calculate your BSA in m² using four medical formulas. Used in drug dosing and clinical medicine.

Find your healthy weight range using four established medical formulas.

Find your Basal Metabolic Rate — calories burned at complete rest.

Total Daily Energy Expenditure — your real daily calorie burn based on activity.

Find the right calorie intake for weight loss, maintenance, or muscle gain.

Calculate your ideal protein, carbohydrate, and fat targets from your calories and goals.

How much water should you drink per day? Get a personalised hydration target.

How many calories do you burn exercising? Calculate by activity, weight, and duration.

How much protein do you need per day? Get a target based on your weight, activity, and goal.

How long will it take to reach your goal weight? Calculate from your calorie deficit.

Find your recommended weight gain range based on pre-pregnancy BMI. IOM 2009 guidelines.

Calculate your estimated due date from your last period or conception date.

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

Find the best time to wake up or go to sleep based on 90-minute sleep cycles.

How many units are in your drink? Calculate from volume and ABV with calorie count.

Estimate your 1RM for any lift using the Epley formula and set training loads.

Convert between pace, speed, and finish time for any race distance.

Calculate your 5 heart rate training zones from your maximum heart rate.

Predict your 5K, 10K, half marathon, and marathon times from a recent race result.