Health Calculators
Free health and fitness calculators — BMI, calories, body fat, water intake, heart rate zones, and more. All run instantly in your browser.
BMI Calculator
Calculate Body Mass Index and see your weight category.
BMR & Calorie Calculator
Estimate basal metabolic rate and daily calorie needs.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
Ideal Weight Calculator
Estimate a healthy target weight based on height and sex.
Water Intake Calculator
Estimate daily water intake based on weight and activity.
Target Heart Rate
Calculate max heart rate and training zones by age.
Pregnancy Due Date
Estimate due date from the first day of your last period.
Why use our health calculators?
- 100% free with no sign-up required
- Instant results — nothing is sent to a server
- Theme-aware and mobile-friendly
- Based on widely used clinical and fitness formulas
- Educational FAQs to help you interpret results