Online Tool Store
Body Frame Size Calculator
Enter your height and wrist circumference to estimate your body frame size classification. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Estimated frame size
Estimate only — a general guideline, not a medical assessment.
How it works
- Enter your height and wrist circumference.
- The height-to-wrist ratio is calculated.
- See your estimated frame size classification.
Estimation divides height by wrist circumference and compares the result against standard small/medium/large ratio thresholds — the common formula used in nutrition and fitness guidelines for a rough frame size estimate.
FAQ
Is this medical advice?
No — this is a general guideline based on a common formula, not a medical assessment. Consult a healthcare provider for personalized guidance.
Is my data uploaded anywhere?
No. The calculation happens entirely in your browser — nothing is sent to a server.
What is "body frame size" used for?
It's a rough classification (small, medium, large) sometimes used alongside height and weight to interpret healthy weight ranges, since frame size affects what a healthy weight looks like.
How is it calculated?
Using the height-to-wrist-circumference ratio — a common formula that classifies frame size into small, medium, or large based on where the ratio falls.
How we compare
| Feature | Online Tool Store | Manual ratio math | Clinical body composition assessment |
|---|---|---|---|
| No formula to remember | ✓ | Easy to get thresholds wrong | Requires an appointment |
| Free, instant | ✓ | ✓ | Costs money and takes time |
A clinical assessment is more precise but requires an appointment. Body Frame Size Calculator gives a free, quick estimate for general reference.