Free Health & Fitness Calculators

BMI, TDEE, macros, body fat, 1RM, running pace, heart rate zones — 12 free calculators. No signup required.

Calculate Body Mass Index with imperial or metric units

Calculate Total Daily Energy Expenditure

Calculate daily calorie deficit for weight loss goals

Calculate daily macronutrient targets

Estimate body fat percentage from measurements

Calculate your one-rep max from submaximal lifts

Calculate pace, speed, and finish times for running

Calculate heart rate training zones

Calculate daily water intake needs

Calculate ideal body weight using multiple formulas

Calculate estimated pregnancy due date

Calculate optimal sleep and wake times

Science-Based Calculators

Every calculator is built on peer-reviewed research and clinical formulas trusted by health professionals.

Using Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle equations.

Your health data never leaves your browser.

No signup, no waiting — calculate and compare immediately.