Enter your height and wrist size to get your height-to-wrist ratio, a simple, commonly cited way to measure body frame size that adds context to weight and BMI charts.
Measure your wrist at its narrowest point, just below the wrist bone.
Frame size is one general estimate among several methods, not a medical measurement. Use it as context alongside other health indicators.
How to Measure Body Frame Size With Your Wrist
Measure your wrist at its narrowest point and divide your height by that number, using the same unit for both. Someone 175 cm tall with a 17 cm wrist gets 175 ÷ 17 = 10.29, a medium frame. A ratio above 10.4 means a small frame and below 9.6 a large one.
- Measure height (175 cm) and wrist (17 cm).
- Divide: 175 ÷ 17 = 10.29.
- Compare: 10.29 is between 9.6 and 10.4, so the frame is medium.
The Height to Wrist Circumference Ratio
The ratio is your height divided by your wrist circumference, and it gives a rough estimate of skeletal size. That matters because a “healthy weight” range can look different on a small frame versus a large one.
Formula: Height-to-wrist ratio = Height ÷ Wrist circumference (both measured in the same units). A ratio above 10.4 indicates a small frame, 9.6 to 10.4 indicates a medium frame, and below 9.6 indicates a large frame.
- Height: your total height, entered in centimeters or inches
- Wrist circumference: measured at the narrowest point of your wrist, just below the wrist bone, in the same unit as your height
Wrist Size Body Frame Chart
A wrist inside the range for your height means a medium frame; smaller is small, larger is large. Values are rounded.
| Height (cm) | Medium frame wrist (cm) |
|---|---|
| 155 | about 14.9 to 16.1 |
| 165 | about 15.9 to 17.2 |
| 175 | about 16.8 to 18.2 |
| 185 | about 17.8 to 19.3 |
| Height (cm) | Wrist (cm) | Ratio & Frame Size |
|---|---|---|
| 170 | 14 | 12.14, Small frame |
| 160 | 15 | 10.67, Small frame |
| 175 | 17 | 10.29, Medium frame |
| 180 | 18 | 10.00, Medium frame |
| 165 | 18 | 9.17, Large frame |
| 190 | 20 | 9.50, Large frame |
Where to Measure Your Wrist for Body Frame Size
Measure around the narrowest part of the wrist, just below the wrist bone. Because the result is a ratio, a small tape error at the wrist shifts it far more than an error in height.
- Use a flexible tape, snug but not tight, and read it twice.
- Measure the same wrist each time so repeat checks are comparable.
- Enter your height without shoes, in the same unit as your wrist.
The result is a rough skeletal estimate. It ignores muscle and body fat, and someone near the edge of a band could reasonably sit in either. Use it for context when reading weight charts, not as a health verdict.
If you are concerned about your weight or bone health, a doctor can assess you properly; this body frame size calculator is educational only. The body mass index article on Wikipedia explains the limits of the weight charts that frame size helps put in context.
Common questions about body frame size
How do you measure body frame size with your wrist?
Measure your wrist at its narrowest point, then divide your height by it using the same unit. Above 10.4 is a small frame, 9.6 to 10.4 medium and below 9.6 large, so 175 cm ÷ 17 cm = 10.29, a medium frame.Where do you measure your wrist for body frame size?
Wrap a flexible tape measure around your wrist at its narrowest point, just below the wrist bone (the bony bump where your hand meets your forearm). Keep the tape snug against the skin without pulling it tight, and use the same unit as your height entry.Does this calculator use different thresholds for men and women?
No. This tool applies a single height-to-wrist ratio scale to every result. Some other frame-size methods do split the thresholds by sex, so results can differ slightly if you compare against a different method.Can I use inches instead of centimeters?
Yes, as long as you enter both your height and your wrist circumference in the same unit. The ratio itself is unitless, so switching consistently between cm and inches will not change your result.Why does frame size matter when looking at BMI or weight charts?
General weight and BMI ranges are built around population averages and do not account for skeletal size. Someone with a larger frame naturally carries more bone and muscle mass, so frame size is often used as extra context alongside those charts, not instead of them.Is body frame size a medical measurement?
No. It is one general, commonly cited estimation method, not a clinical or diagnostic measurement of bone structure. Use it as a rough reference point alongside other health indicators rather than a definitive classification.Related Calculators
Once you know your frame size, it adds useful context to other body-composition tools like the BMI calculator, the ideal weight calculator, or the lean body mass calculator for a fuller picture of your build.