Free health and fitness tools to help you understand your body and track your wellness goals. All calculations stay private in your browser.
Calculate your Body Mass Index from height and weight. Supports both metric (cm/kg) and imperial (in/lbs) measurements with instant category results.
Find your daily calorie needs (TDEE) based on age, gender, weight, height, and activity level using the Mifflin-St Jeor equation.
Estimate your body fat percentage using the U.S. Navy circumference method from simple body measurements.
Calculate your estimated due date, current pregnancy week, and trimester from the first day of your last menstrual period.
Our health calculators use clinically recognized formulas developed and validated by medical researchers. For example, our Calorie Calculator uses the Mifflin-St Jeor equation — the most accurate BMR formula available for most individuals — while our Body Fat Calculator uses the U.S. Navy circumference method used by the military for decades.
These tools provide useful estimates for health tracking, fitness planning, and general wellness awareness. They are not substitutes for medical examinations or professional healthcare advice.