free health calculators online
Health & Fitness Calculators
Calculate common fitness and wellness numbers like BMI, BMR, calories, macros, body fat, water intake, and pregnancy dates.
10 tools available
Popular health & fitness calculators
What you can do with these tools
- Estimate BMI and body fat
- Calculate calories and macros
- Plan hydration goals
- Estimate due dates and age
All health & fitness calculators
Age Calculator
Calculate your exact age in years, months, and days. Also find out the total number of days, weeks, and hours you have lived. 100% Free online tool.
✓ On-deviceOpen tool →BMI Calculator
Calculate your Body Mass Index (BMI) to find out if you are at a healthy weight for your height. Supports metric and imperial measurements.
✓ On-deviceOpen tool →BMR Calculator
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. Find out exactly how many calories your body burns at rest.
✓ On-deviceOpen tool →Body Fat Calculator
Calculate your body fat percentage using the highly accurate US Navy Method. Free body fat calculator based on your neck, waist, and hip measurements.
✓ On-deviceOpen tool →Calorie Calculator
Calculate exactly how many calories you need to eat every day to maintain, lose, or gain weight based on your BMR and activity level.
✓ On-deviceOpen tool →Macro Calculator
Break down your daily calories into exact grams of protein, fats, and carbs based on your diet goals. Supports Keto, Low Carb, and Balanced diets.
✓ On-deviceOpen tool →One Rep Max (1RM) Calculator
Calculate your theoretical one-rep max and get a detailed breakdown of your lifting percentages for powerlifting and bodybuilding.
✓ On-deviceOpen tool →Percentage Calculator
Instantly solve percentage equations. Find discounts, calculate increases/decreases, or determine what percent one number is of another.
✓ On-deviceOpen tool →Pregnancy Due Date Calculator
Calculate your estimated due date, current trimester, and track your pregnancy progress based on your last menstrual period.
✓ On-deviceOpen tool →Water Intake Calculator
Calculate exactly how much water you should drink daily based on your body weight and exercise levels. Free hydration calculator.
✓ On-deviceOpen tool →Health & Fitness Calculators FAQ
Are these health calculators medical advice?
No. They provide general estimates and should not replace advice from a qualified healthcare professional.
Which health calculator should I start with?
BMI Calculator, BMR Calculator, Calorie Calculator, and Macro Calculator are useful for general fitness planning.