Health & nutrition calculators
Free, instant calculators for the numbers that matter — no sign-up, metric or imperial, and shareable by link.
BMI calculator
Free BMI calculator. Enter your weight and height (metric or imperial) to get your Body Mass Index and healthy-weight category.
BMR calculator
Free BMR calculator using the Mifflin–St Jeor equation. Estimate the calories your body burns at complete rest each day.
TDEE calculator
Free TDEE calculator. Estimate your maintenance calories from BMR and activity level — the number of calories you burn per day.
Calorie deficit calculator
Free calorie deficit calculator. Find the daily calories to hit your weekly weight-loss goal, based on TDEE.
Protein intake calculator
Free protein calculator. Find how many grams of protein per day you need for your body weight and goal.
Water intake calculator
Free water intake calculator. Estimate how much water to drink per day from your body weight and activity level.
Body fat calculator
Free body fat percentage calculator using the US Navy tape method. Enter a few measurements to estimate your body-fat percentage.
Macro calculator
Free macro calculator. Split your daily calories into protein, carbs and fat grams for your chosen ratio.
Calories burned calculator
Free calories-burned calculator. Estimate the calories you burn for an activity from your weight and how long you do it.
Ideal weight calculator
Free ideal weight calculator. Estimate a healthy target weight for your height using the Devine formula and the BMI range.