Calorie calculator
How many calories you need a day, and how much protein, carbs and fat. Free, no sign-up, nothing leaves your browser.
Your daily calories
—kcal a day
Fill in your details to see your number.
Fabee sets this up for you and counts every meal against it.
DownloadAn estimate for healthy adults, not medical advice. Pregnant, breastfeeding, under 18 or managing a health condition? Ask your doctor.
How it works
It starts with the Mifflin–St Jeor equation, the most reliable everyday formula for the calories your body burns at rest. That number is multiplied by your activity level to get your maintenance calories. To lose weight it takes off 20% (never more than 500 a day), to gain it adds 350, and it never goes below 1,200.
Protein is set at 2 g per kg of body weight, fat at a quarter of your calories, and carbs fill the rest. It's a starting point: follow it for two or three weeks, watch your weight, and adjust.