Body, fitness and everyday health math — private estimates in seconds.
Whether you are starting a fitness plan, checking a healthy weight range, or just curious about a number, these 22 health and fitness calculators give you a quick, private estimate. Start with the body basics: BMI, BMR, body fat percentage, lean body mass, ideal weight and waist-to-hip ratio. Fuel your training with the calorie calculator (TDEE), macro calculator, protein intake and water intake tools, and see what activity actually burns with the calories burned calculator.
Runners and lifters get a pace calculator, heart rate zone and maximum heart rate calculators, and a one-rep max estimator for the gym. There are also everyday health tools that have nothing to do with the gym: a sleep calculator for better bedtimes, pregnancy and ovulation calculators and a period tracker for family planning, a caffeine calculator, a blood alcohol (BAC) estimator, and a smoking cost calculator that shows what the habit really adds up to.
All of them are free, need no signup, and run entirely in your browser, so anything you enter — weight, dates, habits — stays on your device. Treat the results as helpful estimates for general information; they are not medical advice, and a health professional is the right call for personal decisions.
BAC level estimator
Body mass index health check
Basal metabolic rate
Body fat percentage estimate
Daily caffeine tracker
Daily calorie needs (TDEE)
Calories burned by activity
Training heart rate zones
Healthy weight range
Lean body mass estimate
Protein, carbs and fat macros
Maximum heart rate estimate
One-rep max strength estimate
Fertile window predictor
Running pace and speed
Next period predictor
Pregnancy due date estimator
Daily protein requirements
Optimal sleep cycles
True cost of smoking
Waist-hip ratio check
Daily water intake needs
No. They give general estimates based on widely used formulas, for information and motivation. For anything personal — pregnancy, alcohol, weight concerns — a doctor or qualified health professional is the right source.
BMI compares your weight to your height. BMR is the calories your body burns at complete rest. TDEE — from the calorie calculator — is your BMR adjusted for activity, so it's the better number for planning meals.
No account, no signup and no cost. The tools run in your browser, and anything you enter stays on your device.