User:Crissov/Metrified English units

Length
There is also a version with a nautical mile of 1.85 km, which is much closer to 1' of the circumference of Earth and its current value of 1.852 km. The mile is about ¼ mrad Earth, while a kilometre was at that time believed to be 0.01 gon Earth. The pace was originally 2½ foot, i.e. 30 inches or 7.5 dm, but with 32 inches or 8 dm a mile retains both its definitions: the old Roman one of being 1000 gradus and the English one of 8 furrows long. Also note, that a 1.8-km seamile is 2 000 yards or nine furlongs.

Area
For area measurement of course all length units can simply be squared, e.g. 1 foot² = 9 dm². Those are not explicitly listed here.

Volume, capacity
For volume measures of course all length units can simply be cubed, e.g. 1 foot³ = 27 dm³ = 27 l. Those are not explicitly listed here.

There are at least two gallon-based variants, one with a 4-litre gallon, the other with a 5-litre one. With 5 litre a gallon of water still weighs 10 pounds; note the correspondence between the volume and mass units which share a name.

Mass, weight
The Troy pound gets replaced by the libra, the abbreviation for the real pound has to change accordingly.

Derived units
The knot is acknowledged as 1 nautical mile per hour.

Weight and mass are often confused and it is not surprising, that in many proposals there is no explict mention of (gravitational) force, but the pound-force is still 1 pound times Gee, see also kilopond. The poundal (1 lb.·ft./s²) equals 0.15 N with the above redefinitions of pound and foot.

Likewise you get the units of pressure, e.g. pound-force/inch² or inch mercury. For energy or heat, a British thermal unit is almost exactly 1 kJ already. The units of power are rather new, but it makes sense to round a horse power to 750 W.

Kitchen
There are other metrified values for cup (240 mL or 250 mL), tablespoon (15 mL or 20 mL) and teaspoon (5 mL) in use today, independently from all the other units.

Isolated
Besides redefinitions of the whole system, which try to keep the values close and the system immanent factors intact, there were and are simple approximations of Imperial units in metric.