US、UK、EU、日本のcm表記、中国の靴サイズを、男性・女性・子供向けに相互変換。足のサイズの測り方ガイドと、ブランドごとのフィット感の注意点も掲載。
| サイズ表記 | サイズ |
|---|
足長(cm)はそのままJPサイズになります。足長に約1.5cmを足し、3×足長cm−21でモンドポイント式のEUサイズに近似できます。US(メンズ)=JP−18.5、US(レディース)=US(メンズ)+1.5、UK=US(メンズ)−1、CN=(足長cm×2)−10。
夕方、立った状態で、最も長い指先からかかとまでを測定してください。つま先の余裕として5〜10mmを加えます。
Everything is derived from one number, foot length in centimetres. Japanese sizing is that length unchanged. US men = length − 18.5, US women = US men + 1.5, UK = US men − 1, and Chinese = (length × 2) − 10. The EU figure adds 1.5 cm of shoe allowance and multiplies by the Paris-point factor of 1.5, rounded to the nearest half size. A 26.0 cm foot therefore returns US men 7.5, US women 9, UK 6.5, EU 41.5, JP 26 and CN 42.
Measure standing, at the end of the day, heel to longest toe, and add 5 to 10 mm of toe room before entering the figure, because the tool converts what you type and adds no allowance of its own beyond the fixed 1.5 cm inside the EU formula. Category changes only the headline result: Men shows US men, Women adds 1.5, Kids adds 12.5. In Known size mode the same equations run backwards from the value and system you choose.
These are linear approximations. US and UK sizes really step by a third of an inch, about 0.85 cm, whereas this formula moves a full size per centimetre, so results drift from a brand's own chart the further you go from the middle of the range; expect to be within roughly half a size rather than exact. Width is not modelled at all, the Kids figure is a flat +12.5 offset, and the comparison table always lists adult rows even when Kids is selected.
EU 41.5. The tool adds 1.5 cm of shoe allowance to your foot length and multiplies by 1.5, rounding to the nearest half size. The same foot returns US men 7.5, US women 9, UK 6.5, JP 26 and CN 42.
Japanese sizes are simply foot length in centimetres, so the JP row repeats whatever you measured: a 26 cm foot is JP 26. That makes it the least ambiguous system to buy in, and it is the value every other conversion here is built from.
US women is US men plus 1.5, and UK is US men minus 1, so a US men 8 is a US women 9.5 and a UK 7. The Category select applies those same offsets to the headline result while the table lists all of them.
Stand with weight on the foot, at the end of the day when feet are at their largest, and measure heel to longest toe. Add 5 to 10 mm of toe room before entering the number, and measure both feet, then buy for the larger one.
The built-in brand notes flag Nike as running half a size small and Converse half a size large, with Adidas, Vans and New Balance true to size and Birkenstock sold in EU sizes only. Adjust the converted number by half a step accordingly.
Sleep Cycle Bedtime & Wake Calculator
Bedtime and wake-up times aligned to 90-minute sleep cycles, accounting for fall-asleep latency.
Password Strength & Entropy Calculator
Calculate password entropy in bits and estimated brute-force time across attacker capabilities.
Bra Size Converter (UK / US / EU / AU / JP)
Convert bra sizes between UK, US, EU, AU and JP systems with sister sizes when band/cup doesn't fit.
