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🔬 Peer-Reviewed Formulas
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Your Wellness
Calculator Hub

Professional health calculators trusted by thousands every day. Based on WHO standards, Mifflin-St Jeor equations, and peer-reviewed medical research.

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Our Tools

6 Health Calculators, All Free

Each tool uses established medical formulas — get accurate, instant results with no registration required.

Person checking their weight and BMI
BMI
BMI Calculator
Calculate your Body Mass Index using WHO international standards. Visual gauge with ideal weight range included.
Calculate BMI →
Healthy food calorie counting nutrition
Calories
Calorie Calculator
Find your Total Daily Energy Expenditure using the Mifflin-St Jeor equation — the gold standard used by dietitians.
Calculate Calories →
Fitness body measurement body fat
Body Fat
Body Fat % Calculator
Estimate body fat percentage using the US Navy circumference method — no expensive equipment needed.
Calculate Body Fat →
Fit healthy person at ideal weight
Ideal Weight
Ideal Weight Calculator
See your ideal weight using 5 different medical formulas: Devine, Hamwi, Robinson, Miller, and BMI range.
Calculate Ideal Weight →
Person drinking water daily hydration
Hydration
Water Intake Calculator
Find your optimal daily hydration based on weight, activity, and climate. Includes an hourly drinking schedule.
Calculate Water Need →
Healthy meal with macro nutrients protein carbs fat
Macros
Macro Calculator
Get personalised protein, carbs, and fat targets for your goal — fat loss, muscle gain, maintenance, or keto.
Calculate Macros →
Active healthy lifestyle wellness fitness

Built on Real Science,
Not Guesswork

Every calculator uses the same formulas trusted by doctors, dietitians, and fitness professionals worldwide. We make professional-grade health tools accessible to everyone — completely free.

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WHO BMI classification standards for accurate categories
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Mifflin-St Jeor equation — most accurate calorie formula available
✓
US Navy body fat method — no expensive equipment needed
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All calculations run in your browser — zero personal data stored
✓
Personalised tips and full breakdowns with every result
Why Trust Us

Built on Real Science

🏥
WHO Standards
All BMI classifications follow World Health Organization international guidelines.
🔬
Peer-Reviewed Formulas
We use Mifflin-St Jeor, US Navy body fat, and other published medical equations.
🔒
No Data Collection
All calculations happen in your browser. We never store your personal health data.
📱
Works Everywhere
Fully responsive design works perfectly on mobile, tablet, and desktop devices.
Health Guides

Learn the Science Behind the Numbers

In-depth guides to help you understand what your results actually mean.

Healthy food and wellness BMI lifestyle
BMI Guide
What is BMI? A Complete Guide to Body Mass Index
Learn how BMI is calculated, what the categories mean, its limitations, and what to do with your results.
📖 8 min read · Health & Wellness
Nutrition calorie meal planning food
Calorie Guide
How Many Calories Do You Need? The Complete TDEE Guide
Understand TDEE, BMR, and activity factors — everything you need to manage your weight effectively.
📖 10 min read · Nutrition
Drinking water hydration daily health
Hydration Guide
How Much Water Should You Drink Daily?
The "8 glasses a day" rule is outdated. Here's what modern research actually says about hydration needs.
📖 6 min read · Health