Fitness & health calculators
BMI, TDEE, running pace and the small calculators that come up when you're tracking workouts and nutrition.
Fitness apps are mostly logbooks wrapped around a few formulas: BMI, daily calorie burn, training pace splits. This hub strips the logbook and exposes the formulas directly - useful for a one-off check or for planning a workout when you don't want to install another app. Every tool runs in your browser; your weight, height, age and pace numbers never leave the device.
Body composition
Performance
Time helpers
Free fitness calculators: BMI, TDEE, running pace, training math
Tracking fitness involves a small set of numbers that come up over and over: your BMI for a quick health screen, your TDEE for matching calories to goals, your running pace per kilometre or mile for race planning. This hub puts the calculators on one page, without the social-feed clutter and account-creation that most fitness apps wrap them in. Type the inputs, get the number, close the tab.
Every tool is free, no signup, and runs entirely in your browser. Your weight, height, age, gender and pace numbers never leave your device, never get stored, never get shared with an advertiser. The formulas are the standard ones used in textbooks and clinical practice (BMI = kg/m², Harris-Benedict and Mifflin-St Jeor for BMR, pace = time / distance) - good for a personal estimate, not a substitute for advice from a doctor or coach.
BMI is a screening tool, not a diagnosis: it doesn't distinguish muscle from fat and reads high for athletes and low for older adults with reduced muscle mass. TDEE depends on activity multipliers that are themselves estimates. Use these numbers as a starting point and adjust based on what your body actually does over a few weeks.