Body Frame Size
The wrist carries almost no fat, which makes it a clean place to measure frame. A larger height-to-wrist figure means a finer frame.
Your numbers
Frame index
10
Wrist (cm)
17cm
Height (cm)
170cm
What it means
10 is a medium frame.
Formula
Frame index = Height (cm) ÷ Wrist (cm)
Frame size only nudges a reference weight by a few kilograms; it is not a health measure. A big frame says nothing about body fat.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Height (cm) (cm)Height in centimetres; converted to metres inside the formula. | 170 | 50 and up |
| Wrist (cm) (cm)The narrowest point of the wrist; almost no fat, so it reflects frame. | 17 | 8 ~ 30 |
Step by step
Quick reference table
Results when only Height (cm) (cm) changes and everything else stays put.
| Height (cm) (cm) | Frame index | Wrist (cm) (cm) | Height (cm) (cm) |
|---|---|---|---|
| 85 | 5 | 17 | 85 |
| 128 | 7.53 | 17 | 128 |
| 170 | 10 | 17 | 170 |
| 255 | 15 | 17 | 255 |
| 340 | 20 | 17 | 340 |
What each result means
| Result | At default values |
|---|---|
| Frame indexHeight over wrist circumference; larger means a finer frame. | 10 |
| Wrist (cm) (cm)The narrowest point of the wrist; almost no fat, so it reflects frame. | 17 |
| Height (cm) (cm)Height in centimetres; converted to metres inside the formula. | 170 |
Common mistakes
Frame size only nudges a reference weight by a few kilograms; it is not a health measure. A big frame says nothing about body fat.
Glossary
- Height (cm)
- Height in centimetres; converted to metres inside the formula.
- Wrist (cm)
- The narrowest point of the wrist; almost no fat, so it reflects frame.
- Frame index
- Height over wrist circumference; larger means a finer frame.
Frequently asked questions
Q. How is Body Frame Size calculated?
Frame index = Height (cm) ÷ Wrist (cm) — The wrist carries almost no fat, which makes it a clean place to measure frame. A larger height-to-wrist figure means a finer frame.
Q. Can you walk through an example?
With Height (cm) 170cm, Wrist (cm) 17cm, the answer is Frame index 10.
Q. What do I need to enter?
Enter Height (cm), Wrist (cm). The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Height (cm) (cm) moves the answer to Height (cm) (cm) 85 → Frame index 5 and Height (cm) (cm) 340 → Frame index 20. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Frame size only nudges a reference weight by a few kilograms; it is not a health measure. A big frame says nothing about body fat.
Related calculators
These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.