โค๏ธ Health & Fitness Calculators
Explore 26 free health & fitness calculators on DigiToolkit. Every tool gives instant, accurate results with the formula and a worked example so you understand the maths behind the answer.
Body Composition
View Body Composition โBMI Calculator
BMI = weight(kg) / height(m)^2
Open calculator โBody Fat Calculator
US Navy method using log10 of body circumferences and height
Open calculator โBody Surface Area Calculator
Du Bois: BSA = 0.007184 x weight^0.425 x height^0.725
Open calculator โFFMI Calculator
FFMI = lean mass(kg) / height(m)^2; normalised adds 6.1 x (1.8 - height_m)
Open calculator โLean Body Mass Calculator
Boer formula for lean body mass
Open calculator โBody Measurements
View Body Measurements โBody Shape Calculator
WHR = waist / hip
Open calculator โBra Size Calculator
Band from underbust; cup from the bust-minus-underbust difference
Open calculator โFace Golden Ratio Calculator
phi about 1.6180339887; longer = value x phi, shorter = value / phi
Open calculator โFace Shape Calculator
Ratio = face length / face width; classified into common face-shape bands
Open calculator โMetabolism
View Metabolism โBMR Calculator
Mifflin-St Jeor: BMR = 10xkg + 6.25xcm - 5xage + (5 male / -161 female)
Open calculator โHarris-Benedict Calculator
TDEE = BMR (Mifflin-St Jeor) x activity factor
Open calculator โTDEE Calculator
TDEE = BMR (Mifflin-St Jeor) x activity factor
Open calculator โWeight Management
View Weight Management โIdeal Weight Calculator
Robinson formula plus a BMI 18.5-24.9 healthy range
Open calculator โWeight Gain Calculator
TDEE +/- calorie adjustment for the goal
Open calculator โWeight Loss Calculator
TDEE +/- calorie adjustment for the goal
Open calculator โGrowth
Nutrition
Calories
About health & fitness calculations
DigiToolkit's health & fitness tools make everyday and professional calculations fast and reliable. Each calculator is built around a generally accepted formula, validates your inputs, and explains the result in plain language. Because everything runs in your browser, your data stays private and results appear the moment you type.
Tips for accurate results
- Use consistent units across related fields.
- Check the worked example on each page to confirm your inputs.
- Read the assumptions โ some calculators use standard rates or methods that may differ from your situation.
Health & Fitness calculators โ FAQs
What can I do with the health & fitness calculators?
The Health & Fitness section on DigiToolkit has 26 free calculators. Each one shows its formula, a worked example and instant results.
Are these calculators free?
Yes. Every calculator is free to use with no sign-up, and runs entirely in your browser.
Do I need to install anything?
No. All calculators work directly in your web browser on mobile and desktop.