Science-Backed Calculations

Know Your Numbers.
Hit Your Goals.

Free, precision nutrition calculators built on peer-reviewed science. Get your TDEE, macros, calorie targets, and more — in seconds.

No account required 100% free forever Mifflin-St Jeor formula Privacy friendly

All Calculators

Choose the calculator that matches your goal. They all work together — start with TDEE and build from there.

Find out exactly how many calories your body burns each day based on your activity level.

Calculate the precise calorie deficit you need to lose weight at your desired pace.

Get personalized protein, carbohydrate, and fat targets tailored to your goals.

Calculate your basal metabolic rate — the calories your body burns at complete rest.

Determine your optimal daily protein intake to build muscle or maintain lean mass.

Built for people who want real answers, not guesswork.

All calculators use peer-reviewed equations including Mifflin-St Jeor and Katch-McArdle, the gold standards in sports nutrition.

No account required, no paywalls, no upsells. Just accurate, instant results whenever you need them.

Your measurements stay on your device. We never store personal health data on our servers.

Pick a calculator and get your numbers in under two minutes.