Free tools for BMI, body fat, calorie needs, nutrition, hydration, and running pace
Understanding your body starts with the right measurements. Whether you're tracking weight loss progress, calculating daily calorie needs, planning a marathon training schedule, or estimating your pregnancy due date — accurate, science-backed calculations make the difference between guessing and knowing.
MODOO HUB provides 8 free health calculators grounded in validated clinical formulas. The Calorie Calculator uses the Mifflin-St Jeor equation — the most accurate non-laboratory TDEE method — to determine exactly how many calories your body needs daily. The Body Fat Calculator uses the U.S. Navy circumference method for a reliable body composition estimate without calipers or DEXA scans.
All calculations stay in your browser. No account, no data collection, no ads — just accurate health numbers when you need them.
How accurate is the BMI calculator?▼
BMI is a standard screening metric using weight and height. It doesn't account for muscle mass or fat distribution, so pair it with the Body Fat Calculator for a fuller health picture.
What is the difference between BMI Calculator and BMI Calc?▼
BMI Calculator (Pro) provides a detailed breakdown including BMI category, ideal weight range, and health interpretation with charts. BMI Calc gives a quick single-number result for fast reference.
How do I calculate my daily calorie needs?▼
Use the Calorie Calculator — enter your age, weight, height, sex, and activity level. It returns your TDEE (Total Daily Energy Expenditure) using the Mifflin-St Jeor equation, the most widely validated formula for general use.
Which tools should I combine for a complete fitness plan?▼
Start with BMI Calculator + Body Fat Calculator to assess your baseline. Use Calorie Calculator + Macro Calculator to set daily targets. Track hydration with Water Intake Calculator, and monitor training with Pace Calculator.