BMR & Calorie Calculator

About BMR Calculator

A BMR calculator finds your basal metabolic rate — the calories your body burns at complete rest — using the Mifflin-St Jeor equation. Enter your sex, age, height, and weight, then pick an activity level to get your TDEE: the total calories you burn in a day. From there it shows target calories to lose, maintain, or gain weight. It's an estimate for planning, not medical advice.

Frequently asked questions

What's the difference between BMR and TDEE?

BMR is what you'd burn lying still all day. TDEE (total daily energy expenditure) is BMR multiplied by an activity factor to account for movement and exercise — it's the number that reflects your real daily calorie need.

Which formula does it use?

The Mifflin-St Jeor equation, which research finds more accurate for most people than the older Harris-Benedict formula.

How many calories to lose weight?

A deficit of about 500 calories a day below your TDEE gives roughly one pound (0.45 kg) of loss per week. The calculator shows that lose target, plus a matching gain target, alongside maintenance.

Is this medical advice?

No. It's a general estimate for planning. Individual needs vary with body composition, health conditions, and other factors — check with a professional before making big changes.