mm cm m km inchs feet yards mile 寸(sun) 尺(shaku) 間(ken) 丈(jō) 町(chō) 里(ri) sea mile diameter of the Earth circumference of the Earth to mm cm m km inchs feet yards mile 寸(sun) 尺(shaku) 間(ken) 丈(jō) 町(chō) 里(ri) sea mile diameter of the Earth circumference of the Earth