BMI Calculator
Estimate body mass index from height and weight and show the corresponding standard adult BMI category.
Health & fitness toolsOpenHealth & fitness tools
Health and fitness calculators
Explore general body, nutrition, training, pace and wellbeing estimates with clear safety notices.
20 focused tools
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BMR and TDEE Calculator
Estimate bmr and tdee using sex used by formula, age, weight, height, and activity level, then review the result and supporting breakdown.
Health & fitness toolsOpenCalorie Deficit Calculator
Estimate calorie target using estimated maintenance calories and target weekly weight change, then review the result and supporting breakdown.
Health & fitness toolsOpenMacro and Protein Calculator
Calculate macros using daily calories, body weight, protein target, and fat percentage, then review the result and supporting breakdown.
Health & fitness toolsOpenDaily Water Intake Calculator
Estimate water intake using body weight, exercise duration, and climate, then review the result and supporting breakdown.
Health & fitness toolsOpenBody Fat Calculator
Estimate body fat using sex used by formula, height, waist, neck, and hip, then review the result and supporting breakdown.
Health & fitness toolsOpenIdeal Weight Calculator
Estimate reference weight using sex used by formula and height, then review the result and supporting breakdown.
Health & fitness toolsOpenWaist-to-Height Ratio Calculator
Calculate ratio using waist circumference and height, then review the result and supporting breakdown.
Health & fitness toolsOpenHeart Rate Zone Calculator
Calculate zones using age, resting heart rate, and method, then review the result and supporting breakdown.
Health & fitness toolsOpenRunning Pace Calculator
Calculate pace using distance, distance unit, hours, minutes, and seconds, then review the result and supporting breakdown.
Health & fitness toolsOpenRace Time Predictor
Predict race time using known distance, known time (minutes), target distance, and fatigue exponent.
Health & fitness toolsOpenSteps, Distance and Calories Calculator
Estimate distance and calories using steps, stride length, and body weight, then review the result and supporting breakdown.
Health & fitness toolsOpenExercise Calorie Burn Calculator
Estimate calories using body weight, duration, and met value, then review the result and supporting breakdown.
Health & fitness toolsOpenOne-Rep Max Calculator
Estimate one-rep max using weight lifted and repetitions, then review the result and supporting breakdown.
Health & fitness toolsOpenWeight Plate Calculator
Calculate plates using target total weight, bar weight, and plate system, then review the result and supporting breakdown.
Health & fitness toolsOpenWorkout Interval Timer
Run timed work, rest and preparation intervals for a chosen number of workout rounds.
Health & fitness toolsOpenCaffeine Half-Life Calculator
Estimate caffeine remaining using caffeine consumed, hours elapsed, and half-life, then review the result and supporting breakdown.
Health & fitness toolsOpenMenstrual Cycle and Ovulation Calculator
Estimate cycle dates using first day of last period, average cycle length, and average period length, then review the result and supporting breakdown.
Health & fitness toolsOpenPregnancy Due Date Calculator
Estimate due date using calculate from, date, and cycle length, then review the result and supporting breakdown.
Health & fitness toolsOpenBlood Alcohol Estimate Calculator
Estimate bac using body factor, body weight, standard drinks, and hours since first drink, then review the result and supporting breakdown.
Health & fitness toolsOpenWhat this category covers
Health and fitness calculators provide general measurements and planning estimates. They can explain a formula or range but do not diagnose a condition or account for every individual factor.
Recommended starting tools
- BMI Calculator — Estimate body mass index from height and weight and show the corresponding standard adult BMI category.
- Calorie Deficit Calculator — Estimate calorie target using estimated maintenance calories and target weekly weight change, then review the result and supporting breakdown.
- Macro and Protein Calculator — Calculate macros using daily calories, body weight, protein target, and fat percentage, then review the result and supporting breakdown.
How to choose
Read suitability limits before entering values and use authoritative clinical guidance for decisions. Treat trend and context as more useful than a single isolated estimate.
Frequently asked questions
Can these tools diagnose a health condition?
No. They provide general information and cannot replace assessment by an appropriately qualified professional.
Are results suitable for children or pregnancy?
Not unless the specific tool explicitly states that its method is designed for that group.