厘米数×2-10=欧制 (欧制+10)÷2=厘米数厘米数-18+0.5=美制 美制+18-0.5=厘米数厘米数-18=英制 英制+18=厘米数单位cm22.52323.52424.525.025.526EUR欧码3536373839404142US美码566.57.58.591011UK英码344.55.56.5789单位cm2525.52626.527282930EUR欧码3940414243444546US美码77.588.59101112UK英码6.577.588.59.510.511.5