Page BASIC UNITS SI IMPERIAL Distance metre m 0 centimetres 10 cm in ft 00 millimetres 100 mm ft yd 28 ft mile 76 yd mile kilometre km 00 m Conversions in 5. mm ft 0.4 cm mile .6 km yd .91 m m .2 ft Area sq metre m 0 cm ft 4 in 0 0 mm yd ft sq mile 4 acre section 0 m hectare ha sq km km 0 0 m Conversions in .4 cm 4 mm m 0. ft acre .40 ha sq mile .5 km