帽子尺码对照表与头围转换器
帽子尺码来自头围。欧洲和亚洲大多数地区直接用周长厘米(56、57、58)，美国和英国把英寸周长除以圆周率得到7 1/8、7 1/4这类分数，休闲棒球帽则简化为S/M/L/XL。头围57cm对应美码7 1/8、英码7、欧码57，在多数帽子品牌中是M。New Era的合身款(fitted)棒球帽采用美国分数体系。
用软尺绕头部最宽处测量，位置在耳朵上方约1cm、经过前额中部，保持水平、贴合但不勒紧，向上取整到0.5cm。头发浓密或打算戴在毛线帽外面，加1cm。礼帽、合身棒球帽这类有型的帽子需要精确尺码；可调节帽和针织帽覆盖3到4cm范围，比较宽容。
尺码表
| Head (cm) | Head (in) | US | UK | International |
|---|---|---|---|---|
| 52 | 20 1/2 | 6 1/2 | 6 3/8 | XS |
| 53 | 20 7/8 | 6 5/8 | 6 1/2 | XS |
| 54 | 21 1/4 | 6 3/4 | 6 5/8 | S |
| 55 | 21 5/8 | 6 7/8 | 6 3/4 | S |
| 56 | 22 | 7 | 6 7/8 | M |
| 57 | 22 1/2 | 7 1/8 | 7 | M |
| 58 | 22 7/8 | 7 1/4 | 7 1/8 | L |
| 59 | 23 1/4 | 7 3/8 | 7 1/4 | L |
| 60 | 23 5/8 | 7 1/2 | 7 3/8 | XL |
| 61 | 24 | 7 5/8 | 7 1/2 | XL |
| 62 | 24 3/8 | 7 3/4 | 7 5/8 | XXL |
| 63 | 24 3/4 | 7 7/8 | 7 3/4 | XXL |
| 64 | 25 1/4 | 8 | 7 7/8 | XXL |
尺码仅供参考，不同品牌可能有所差异
常见问题
头围58cm是多大的帽子？▾
58cm对应美码7 1/4、英码7 1/8、欧码58，在S/M/L品牌中为M到L，英寸为22 7/8。成人头围约53到64cm，57到58cm最常见。
美码帽子尺码怎么计算？▾
头围英寸除以3.14。22.5英寸(57cm)得7.16，取7 1/8。美码每1/8档约相当于1cm头围。同一头围英码比美码小1/8。
帽子S、M、L分别是多少厘米？▾
通常S为55到56cm，M为57到58cm，L为59到60cm，XL为61到62cm。部分品牌相差1cm，购买合身款时请查看品牌自己的尺码表。
头围在两个尺码之间该选大的吗？▾
有型的帽子应选大：太紧会头痛且很难撑大。毛毡帽可用调节海绵条缩小，所以买大再填充比买小更稳妥。
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