Health Calculators

Free health and fitness calculators for calories, BMI, body fat, protein and hydration. Understand your body metrics and plan your nutrition goals with confidence.

How to Use These Health Calculators

These calculators use widely accepted equations - such as the Mifflin-St Jeor formula for BMR and the US Navy method for body fat - to estimate your metrics based on your weight, height, age and activity. Results are estimates, not medical advice.

  • Calories - daily intake, BMR and TDEE estimates
  • Body - BMI, body fat percentage and age
  • Nutrition - protein, macros and water intake targets

Water Intake Calculator

Find out how much water you should drink each day based on your weight and activity.

Protein Intake Calculator

Calculate how much protein you need per day for your weight and fitness goal.

TDEE Calculator

Calculate your total daily energy expenditure and maintenance calories.

Body Fat Calculator

Estimate your body fat percentage using the US Navy circumference method.

Macro Calculator

Calculate your daily protein, carb and fat targets for your fitness goal.

Age Calculator

Calculate your exact age in years, months and days from your date of birth.

BMR Calculator

Calculate your basal metabolic rate using the Mifflin-St Jeor equation.

Calorie Calculator

Estimate your daily calorie needs to maintain, lose or gain weight.