Distance is usually measured in metres, m, but can also be measured in centimetres, cm, millimetres, mm, kilometres, km or miles.

1 mile=1.609 km (often approximated to 1.6) = 1609 metres (often approximated to 1600) = 160900 cm = 1609000 mm

Speed is usually measured in metres per second, m/s, or kilometres per hour, km/h, or miles per hour, mph.

1 m/s =3.6 km/h =2.25 mph (using 1 mile =1.6 km)

Time is usually measured in seconds but can also be measured in minutes, hours, days and years.

1 minute = 60 seconds

1 hour = 60 minutes = 3600 seconds

1 day = 24 hours = 86400 seconds

1 year = 365 days = 31536000 seconds

Area is usually measured in square metres, m^{2}, but can also be measured in square millimetres, mm^{2}, square centimetres, cm^{2}, square kilometres, km^{2}, or square miles.

1 square mile = 2.56 km^{2} = 2560000 m^{2} =25600000000 cm^{2} =2560000000000 mm^{2} (using 1 mile = 1.6 km)

Volume is usually measured in cubic metres, m^{3}, but can also be measured in cubic millimetres, mm^{3}, cubic centimetres, cm^{3}, cubic kilometres, km^{3}, or cubic miles.

1 cubic mile = 4.096 km^{3} = 4096000000 m^{3} =256000000000000 cm^{3} =256000000000000000 mm^{3}

(using 1 mile =1.6 km)

It is important that areas transform as, for example, 1m^{2} =(100cm)^{2} =10000 cm^{2} and 1m^{3} =(100cm)^{3} =1000000 cm^{3}