Every calorie app, calculator, and "1,200 calories should work" guess starts from the same rough formula. Enter your details and we'll show you that estimate — then exactly why it's a starting point, not the real number.
Your Estimated Resting Burn
Here's what a calculator would say
Based on the Mifflin-St Jeor equation — the same formula behind most calorie apps and online calculators.
1,650
estimated calories burned at rest / day
This is a formula, not a measurement. Mifflin-St Jeor assumes everyone with your age, sex, height and weight burns the same amount at rest — but real resting metabolism varies significantly with muscle mass, hormones, and your history of dieting.
Two people with identical stats can have meaningfully different actual metabolisms
An RMR test measures your number directly, using your actual oxygen consumption — not a population average
