Health & Fitness Calculators
BMI, calories, macros, heart rate, running pace and fitness math.
MaxTools' health and fitness calculators turn body measurements and activity numbers into useful answers: your BMI and what it means, the calories you burn at rest and during exercise, how much protein you need, your target heart-rate zones, and the pace math behind your runs.
Every calculator is free, private and runs entirely in your browser — no account, no data upload. Results are educational estimates based on common formulas and population averages; they are not medical advice, so always discuss health decisions with a qualified professional.
All health & fitness calculators
BMI Calculator
Calculate your Body Mass Index and see the healthy weight range for your height.
HealthBMR Calculator
Find your Basal Metabolic Rate — the calories your body burns at rest.
HealthTDEE Calculator
Total Daily Energy Expenditure — the calories you need to maintain your weight.
HealthMacro Calculator
Split your daily calories into protein, carbs and fat targets.
HealthCalorie Deficit Calculator
Plan your daily calorie target and the time to reach your goal weight.
HealthBody Fat Calculator
Estimate body fat percentage from tape measurements — no special equipment.
HealthIdeal Weight Calculator
Ideal body weight by formula plus the healthy BMI range for your height.
HealthCalorie Burn Calculator
Estimate calories burned during running, cycling, gym and 12 more activities.
HealthWater Intake Calculator
How much water should you drink a day? Weight-based hydration target.
HealthHeart Rate Zone Calculator
Find your five training zones from max heart rate — and the Karvonen version.
HealthRunning Pace Calculator
Convert pace, speed and finish time for any run distance.
HealthRace Time Predictor
Predict your 5K, 10K, half marathon and marathon times from one result.
HealthSteps to Distance Calculator
Convert steps to kilometers, miles, feet and calories burned.
HealthSleep Cycle Calculator
Best times to go to bed to wake refreshed — based on 90-minute cycles.
HealthOne Rep Max Calculator
Estimate your 1RM from any set — Epley and Brzycki formulas.
HealthVO2 Max Calculator
Estimate VO₂max from a 12-minute Cooper test run.
HealthWaist to Height Ratio Calculator
The 'waist under half your height' rule — a quick central-fat risk check.
HealthWaist to Hip Ratio Calculator
Check body-fat distribution risk with the WHO waist-to-hip guideline.
HealthLean Body Mass Calculator
Estimate muscle-and-more mass: everything in your body that isn't fat.
HealthBSA Calculator
Body Surface Area from weight and height — Mosteller and Du Bois formulas.
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