The Mifflin-St Jeor Formula

This calculator uses the Mifflin-St Jeor equation to estimate Basal Metabolic Rate (BMR), the calories your body burns at rest. That figure is then multiplied by an activity factor to estimate your Total Daily Energy Expenditure (TDEE).

Using Your Result

To maintain your current weight, aim to eat close to your TDEE. To lose weight, eat somewhat below it; to gain weight, eat somewhat above it, ideally under the guidance of a healthcare professional.