All Health Calculators

Every tool is free, mobile-friendly, works in US or metric units, and remembers your details between calculators — enter your stats once.

Calorie CalculatorHow many calories you need each day to maintain, lose or gain weight.BMI CalculatorBody Mass Index, weight category and your healthy weight range.TDEE CalculatorTotal Daily Energy Expenditure — maintenance calories with activity.BMR CalculatorBasal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict or Katch-McArdle.Body Fat CalculatorBody fat percentage with the U.S. Navy tape method, plus lean mass.Ideal Weight CalculatorIdeal body weight from four peer-reviewed formulas plus the healthy BMI range.Macro CalculatorDaily protein, carbs and fat in grams for your calorie goal and diet style.Calories Burned CalculatorCalories burned by walking, running, cycling and 30+ activities (MET-based).Calorie Deficit CalculatorThe daily deficit you need to reach your goal weight by a target date.

Which calculator should I start with?

Start with the Calorie Calculator — it gives you maintenance calories and goal targets in one shot. From there, the Macro Calculator turns your target into protein, carbs and fat, and the Calorie Deficit Calculator maps the timeline to your goal weight.

Curious about body composition? The BMI and Body Fat calculators pair well together — BMI for the quick screen, the Navy tape method for what the scale can't tell you.