BMI Calculator
Calculate your Body Mass Index, see your BMI category, healthy weight range, and how close you are to optimal.
CalculateHealth & Fitness Calculators
FitUtils is a free hub of science-backed health and fitness calculators. Whether you're tracking your BMI, estimating calorie needs, or planning your training — we give you accurate results instantly, with no signup, no ads in your face, and no fluff.
TDEE Calculator
Find your Total Daily Energy Expenditure — the number of calories you burn each day based on your activity level.
Coming SoonBMR Calculator
Estimate your Basal Metabolic Rate — the calories your body burns at complete rest to maintain basic functions.
Coming Soon1RM Calculator
Estimate your one-rep maximum for any lift using your reps and weight, using the most reliable strength formulas.
Coming SoonWhy FitUtils?
Always free
No premium plans, no paywalls. Every calculator is free forever.
No signup required
We don't ask for your email. Just open and calculate.
Accurate formulas
Based on WHO, CDC, and peer-reviewed research. No guesswork.
Works everywhere
Fully responsive — works great on any phone, tablet, or desktop.