How does the Calorie Calculator work?

Our Calorie Calculator uses the Mifflin-St Jeor equation, the most accurate formula for estimating your Basal Metabolic Rate (BMR) — the number of calories your body burns at complete rest.

Your BMR is multiplied by an activity factor to calculate your Total Daily Energy Expenditure (TDEE). This is the number of calories you need to maintain your current weight.

To lose weight, aim for a 500 kcal/day deficit. To gain weight, add 500 kcal/day. All calculations are performed locally in your browser and no data is sent to our servers.