Are these medical results?
No. These are educational estimates and do not replace advice from a qualified healthcare professional.
Body & health
Body metrics calculator for BMI, BMR, and TDEE.
Enter your measurements once to calculate five related body and energy estimates in a clear, private snapshot.
5 results browser local
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Related results
Your complete snapshot
Ready when you are
Enter your details once to calculate five related metrics together.
How it works
Made for one clear task.
Use the full body metrics suite for a broader educational snapshot rather than a single number. The calculator keeps every estimate in the browser and makes it easy to compare BMI, body surface area, resting energy, and activity-adjusted energy without re-entering information.
- BMI and a reference healthy-weight range
- Body surface area using the Mosteller formula
- BMR and activity-adjusted daily energy estimates
Formula references
Compare BMI guidance with the CDC adult BMI guidance. BMR uses the published Mifflin–St Jeor equation; for personalized weight planning, see the NIH Body Weight Planner.
Common questions
Body metrics calculator for BMI, BMR, and TDEE. FAQs
Does Smile Tools store my measurements?
No. The calculator runs in your current browser and does not send your measurements to a server.