1、英寸分数（in）英寸小数（in） 我国习惯称呼毫米（mm）1/641/323/641/165/643/327/641/89/645/3211/643/1613/647/3215/641/417/649/3219/645/1621/6411/3223/643/825/6413/3227/647/1629/6415/3231/641/233/6417/3235/649/1637/6419/3239/645/841/6421/320.0156250.0312500.0468750.0625000.0781250.0937500.1093750.1250000.1406250.1562500.1718
2、750.1875000.2031250.2187500.2343750.2500000.2656250.2812500.2968750.3125000.3281250.3437500.3593750.3750000.3906250.4062500.4218750.4375000.4531250.4687500.4843750.5000000.5156250.5312500.5468750.5625000.5781250.5937500.6093750.6250000.6406250.656250一厘二毫半二厘半三厘七毫半半分六厘二毫半七厘半八厘七毫半一分一分一厘二毫半一分二厘半一分三厘七毫半一
3、分半一分六厘二毫半一分七厘半一分八厘七毫半二分二分一厘二毫半二分二厘半二分三厘七毫半二分半二分六厘二毫半二分七厘半二分八厘七毫半三分三分一厘二毫半三分二厘半三分三厘七毫半三分半三分六厘二毫半三分七厘半三分八厘七毫半四分四分一厘二毫半四分二厘半四分三厘七毫半四分半四分六厘二毫半四分七厘半四分八厘七毫半五分五分一厘二毫半五分二厘半0. 3968750.7937501.1906251.5875001.9843752.3812502.7781252.1750003.5718753.9687504.3656254.7625005.1593755.5562505.9531256.3500006.74687
4、57.1437507.5406257.9375008.3343758.7312509.1281259.5250009.92187510.31875010.71562511.11250011.50937511.90625012.30312512.70000013.09687513.49375013.89062514.28750014.68437515.08125015.47812515.87500016.27187516.66875043/6411/1645/6423/3247/643/449/6425/3251/6413/1653/6427/3255/647/857/6429/3259/641
5、5/1661/6431/3263/6410.6718750.6875000.7031250.7187500.7343750.7500000.7656250.7812500.7968750.8125000.8281250.8437500.8593750.8750000.8906250.9062500.9218750.9375000.9531250.9687500.9843751.000000五分三厘七毫半五分半五分六厘二毫半五分七厘半五分八厘七毫半六分六分一厘二毫半六分二厘半六分三厘七毫半六分半六分六厘二毫半六分七厘半六分八厘七毫半七分七分一厘二毫半七分二厘半七分三厘七毫半七分半七分六厘二毫半七分七厘半七分八厘七毫半一英寸17.06562517.46250017.85937518.25625018.65312519.05000019.44687519.84375020.24062520.63750021.03437521.43125021.82812522.22500022.62187523.01875023.41562523.81250024.20937524.60625025.00312525.400000
