英制<--->公制單吋內對照

英制(8進制)=公制(十進制)
1分( 1/8" ) = 3.175mm
2分( 2/8" ) = 6.35mm
3分( 3/8" ) = 9.525mm
4分( 1/2" ) = 12.7mm
5分( 5/8" ) = 15.875mm
6分( 6/8" ) = 19.05mm
7分( 7/8" ) = 22.225mm
8分( 1" ) = 25.4mm

1英呎=12吋 , 3英呎=1碼=36吋