Inner Diameter (mm) to US Fitted Hat Size (Loose Fit)
1 Inner Diameter value = 0.03937 US Fitted value · profile-dependent conversion · context: size system and fit profile
Direct Answer
1 Inner Diameter value equals 0.03937 US Fitted value
This result depends on the selected profile context: size system and fit profile.
For 6 Inner Diameter value, this profile returns 0.23622 US Fitted value.
Converter Calculator
1 Inner Diameter (mm) value =
0.03937 US Fitted value
Explanation
Inner Diameter (mm) converts to US Fitted by normalizing to head circumference in millimeters, then mapping to the destination system. Fit profile fixed: Loose Fit.
From Inner Diameter value to US Fitted value, results depend on the selected size system and fit profile and stay consistent with that profile across table rows and calculator input.
Read more
Keep the same profile in both directions to avoid mixing lookup systems that use different size mappings.
Common Conversion Values
| Inner Diameter (mm) value | US Fitted value |
|---|---|
| 6 | 0.23622 |
| 6.5 | 0.255906 |
| 7 | 0.275591 |
| 7.25 | 0.285433 |
| 7.5 | 0.295276 |
| 8 | 0.314961 |
| 54 | 2.125984 |
| 56 | 2.204724 |
| 58 | 2.283465 |
| 60 | 2.362205 |
| 62 | 2.440945 |