Burnie Academy
What your smartwatch calls your BMR (and why it is a guess)

What your smartwatch calls your BMR (and why it is a guess)

Your smartwatch shows a big 'resting calories' number and calls it your BMR. That number is not measured by your pulse. It is a formula guess made from your age, weight, height, and sex. Here is why it wobbles and how to use it well.

1 Aug 2026 · Burnie Academy
bmr smartwatch resting-calories estimation

You tap your watch. It says 'Resting calories: 1,650.' That looks like a fact your body handed to the watch. It is not. Your watch did not measure those calories. It guessed them from a maths formula. This short read explains what that big number really is. It also shows why two friends the same weight can see very different resting numbers on their wrists.

CONTINUE READING FOR FREE

Unlock the complete article

Register with just your mobile number and OTP. No password and no payment.

Use this same phone number in the Burnie mobile app. Your profile, liked articles and favourites will stay synced.

By continuing, you agree to Burnie's Terms and Privacy Policy.

Track your food the honest way

Burnie helps you see your estimated calorie deficit with familiar Indian foods — no fake precision, no guilt trips.

Get Burnie on the App Store

Sign in with the same mobile number you use for Academy. Android public availability is being expanded.