Kilos to Miles Kilos to Miles This is a useful method for when travelling between imperial and metric countries and need to know what kilometres to miles are. The formula to convert kilometres to miles is number of (kilometres / 8 ) X 5 So lets try 80 kilometres into miles 80/8 = 10 multiplied by 5 is 50 miles! Another example 40 kilometres 40 / 8 = 5 5 X 5= 25 miles