Question: 1 em is how many metres?
Answer: 1 Em = 1000000000000000000 m. 1 x 1000000000000000000 m = 1000000000000000000 Meters. In relation to the base unit of [length] => (meters), 1 Exameters (Em) is equal to 1000000000000000000 meters, while 1 Meters (m) = 1 meters.