Fitness and Health Calculators - Free Online Tools
BMI Calculator
Free BMI calculator: enter your height and weight to see your body mass index and which WHO category it falls into, in metric or imperial units.
Body Fat Calculator
Free body fat calculator: estimate your body fat percentage with the U.S. Navy tape method and see which fitness category your result falls into.
Calorie Calculator
Free calorie calculator: estimate your daily calorie needs with the Mifflin-St Jeor formula, based on age, weight, height and activity level.
Fitness Goal Timeline Calculator
Free fitness goal calculator: see how many weeks it will take to reach your target weight from your current stats and weekly effort.
Ideal Weight Calculator
Free ideal weight calculator: see your healthy weight range from height, age and gender using the Hamwi, Devine and Robinson formulas side by side.
Macro Calculator
Split a daily calorie target into grams of protein, carbohydrate and fat. Pick a preset or set your own percentages and watch them balance.
Ovulation Calculator
Enter the first day of your last period and your usual cycle length to see the likely fertile window, ovulation day and next period date.
Pace Calculator
Fill in any two of pace, time and distance and the third appears, along with the split times you need to hold on race day.
Sleep Calculator
Say when you must get up, or when you are going to bed, and see the times that land at the end of a sleep cycle rather than the middle.
Target Heart Rate Calculator
Free target heart rate calculator: find your fat-burn, cardio and peak zones from age and resting pulse using the Karvonen formula.
Water Intake Calculator
Free water intake calculator: work out how much you should drink each day from your weight, activity level and climate, in litres or ounces.
Waist-to-Hip Ratio Calculator
Free waist-to-hip ratio calculator: enter your waist and hip measurements to see your ratio and the health risk band defined by WHO guidelines.
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Fitness and Health Calculators