Free Health & Fitness Calculators
Simple, accurate tools to understand your body — no sign-up, no tracking, everything runs in your browser.
BMI Calculator
Work out your Body Mass Index and see which weight category you fall into.
BMR Calculator
Estimate your Basal Metabolic Rate — the calories you burn at rest.
Calorie Calculator (TDEE)
Find your daily calorie needs based on your activity level.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method.
Ideal Weight Calculator
See a healthy weight range for your height and gender.
Water Intake Calculator
How much water you should drink each day based on your weight.
Why use FitCalc?
Every calculator runs entirely in your browser. Your height, weight and age never leave your device, and there is nothing to install or sign up for. The formulas behind each tool are the standard ones used by health professionals (Mifflin-St Jeor, the U.S. Navy method, and WHO BMI categories), and each page explains the math so you can see exactly where your number comes from.
Where to start
- New here? Start with the BMI calculator for a quick overview.
- Planning your diet? Use the calorie (TDEE) calculator.
- Tracking fitness progress? The body fat calculator is more useful than weight alone.
These tools are for general information only and are not medical advice. Always consult a qualified professional for health decisions.