Calorie Calculator

How it's calculated

This uses the Mifflin-St Jeor equation — the formula most dietitians prefer — to estimate your BMR (calories burned at complete rest), then multiplies by an activity factor to get your TDEE, the calories that keep your weight stable. The loss and gain targets shift that by 500 kcal/day, roughly half a kilo (one pound) per week.

Frequently asked questions

How accurate is this?

Within about ±10% for most people — genetics, muscle mass and hormones all shift the real number. Treat it as a starting point: track your weight for two weeks and adjust by 100–200 kcal if it's moving the wrong way.

Why does muscle change the numbers?

Muscle burns more energy at rest than fat, so muscular people run hotter than the formula predicts and should pick a slightly higher estimate.

This is an educational estimate, not medical advice — consult a professional before major diet changes.