The following imperial units are still used in the United Kingdom despite general conversion to the metric system: mile, yard, foot, inch for road traffic signs, distance and speed measurement; pint for draught beer and cider and for milk in returnable containers; acre for land registration; troy ounce for transactions in precious metals; pounds and ounces in all small-scale (especially market) transactions involving weight.
The purity of gold is expressed as parts of 1,000, so that a fineness of 800 is 80% gold. Pure gold is defined as 24 carats (1,000 fine). Dental gold is usually 16 or 20 carat; gold in jewellery 9–22 carat. A golden sovereign is 22 carat.
1 metric carat = 200 milligrams.
Gold and silver are usually measured in troy weights: 1 troy ounce = 155.52 metric carats.
A standard international bar of gold is 400 troy ounces; bars of 250 troy ounces are also used.
Metric units not generally recommended as SI units or for use with SI are marked with an asterisk (eg, Calorie*).
a Sometimes dk is used (eg, in Germany).
Beer
Champagne
Wines and spirits
Water
1 litre weighs 1kg.
1 cubic m weighs 1 tonne.
1 UK gallon weighs 10.022lb.
1 US gallon weighs 8.345lb.
Energy
Radioactivity
Dose of radiation
Energy is measured in kilowatt hours and power is measured in kilowatts. Energy is power multiplied by time, thus the kilowatt-hour is one unit of energy.
Crude oil
Clothing sizes (rough equivalents)
Paper sizes
“A” Series (metric sizes)
A0 = 841mm [.dotmath] 1,189mm (33.11 in [.dotmath] 46.81 in)
A3 = 297mm [.dotmath] 420mm (11.69 in [.dotmath] 16.54 in)
A4 = 210mm [.dotmath] 297mm (8.27 in [.dotmath] 11.69 in)
A5 = 148mm [.dotmath] 210mm (5.83 in [.dotmath] 8.27 in)
A6 = 105mm [.dotmath] 148mm (4.13 in [.dotmath] 5.83 in)
A7 = 74mm [.dotmath] 105mm (2.91 in [.dotmath] 4.13 in)
Multiply number of |
by |
to obtain equivalent number of |
|
Length |
|||
inches (in) |
25.4 |
millimetres (mm) |
|
inches |
2.54 |
centimetres (cm) |
|
feet (ft) |
30.48 |
centimetres |
|
feet |
0.3048 |
metres (m) |
|
yards (yd) |
0.9144 |
metres |
|
miles (land 5,280 ft) |
1.609344 |
kilometres (km) |
|
miles (UK sea) |
1.853184 |
kilometres |
|
miles, international nautical |
1.852 |
kilometres |
|
|
|
|
|
Area |
|||
sq. inches (in2) |
645.16 |
sq. millimetres (mm2) |
|
sq. inches |
6.4516 |
sq. centimetres (cm2) |
|
sq. ft (ft2) |
929.0304 |
sq. centimetres |
|
sq. ft |
0.092903 |
sq. metres (m2) |
|
sq. yards (yd2) |
0.836127 |
sq. metres |
|
acres |
4046.86 |
sq. metres |
|
acres |
0.404686 |
hectares (ha) |
|
acres |
0.004047 |
sq. kilometres (km2) |
|
sq. miles |
2.58999 |
sq. kilometres |
|
Volume and capacity |
|||
cu. inches (in3) |
16.387064 |
cu. centimetres (cm3) |
|
UK pints |
34.6774 |
cu. inches |
|
UK pints |
0.5683 |
litres (l) |
|
UK gallons |
4.54609 |
litres |
|
US gallons |
3.785 |
litres |
|
cu. feet (ft3) |
28.317 |
litres |
|
cu. feet |
0.028317 |
cu. metres (cm3) |
|
UK gallons |
1.20095 |
US gallons |
|
|
|
|
|
Length |
|||
0.03937 |
inches |
||
centimetres |
0.3937 |
inches |
|
centimetres |
0.03281 |
feet |
|
metres |
39.3701 |
inches |
|
metres |
3.2808 |
feet |
|
metres |
1.0936 |
yards |
|
metres |
0.54681 |
fathoms |
|
kilometres |
0.62137 |
miles (land) |
|
kilometres |
0.53961 |
miles (UK sea) |
|
kilometres |
0.53996 |
miles (int’l nautical) |
|
|
|
|
|
Area |
|||
sq. millimetres |
0.00155 |
sq. inches |
|
sq. centimetres |
0.1550 |
sq. inches |
|
sq. metres |
10.7639 |
sq. feet |
|
sq. metres |
1.19599 |
sq. yards |
|
hectares |
2.47105 |
acres |
|
sq. kilometres |
247.105 |
acres |
|
sq. kilometres |
0.3861 |
sq. miles |
|
|
|
|
|
Volume and capacity |
|||
cu. centimetres |
0.06102 |
cu. inches |
|
litres |
61.024 |
cu. inches |
|
litres |
2.1134 |
US pints |
|
litres |
1.7598 |
UK pints |
|
litres |
0.2642 |
US gallons |
|
litres |
0.21997 |
UK gallons |
|
hectolitres |
26.417 |
US gallons |
|
hectolitres |
21.997 |
UK gallons |
|
|
|
|
|
0.832674 |
UK gallons |
||
|
|
|
|
weight (mass) |
|||
ounces, avoirdupois (oz) |
28.3495 |
grams (g) |
|
ounces, troy (oz tr) |
31.1035 |
grams |
|
ounces, avoirdupois |
0.9115 |
ounces, troy |
|
pounds, avoirdupois (lb) |
453.59237 |
grams |
|
pounds, avoirdupois (lb) |
0.45359 |
kilograms (kg) |
|
short tons (2,000 lb) |
0.892857 |
long tons |
|
short tons (2,000 lb) |
0.907185 |
tonnes (t) |
|
long tons (2,240 lb) |
1.12 |
short tons |
|
long tons (2,240 lb) |
1.01605 |
tonnes |
|
velocity and fuel consumption |
|||
miles/hour |
1.609344 |
kilometres/hour |
|
miles/hour |
0.868976 |
international knots |
|
miles/UK gallon |
0.35401 |
kilometres/litre |
|
miles/US gallon |
0.42514 |
kilometres/litre |
|
UK gallons/mileb |
282.481 |
litres/100 kilometres |
|
US gallons/mileb |
235.215 |
litres/100 kilometres |
|
Temperature |
|||
degrees Fahrenheit |
5/9 after subtracting 32 |
degrees Celsius (centigrade) |
|
-40°F |
equals |
-40°C |
|
32°F |
equals |
0°C |
|
59°F |
equals |
15°C |
|
2.838 |
US bushels |
||
hectolitres |
2.750 |
UK bushels |
|
cu. metres |
35.3147 |
cu. feet |
|
cu. metres |
1.30795 |
cu. yards |
|
cu. metres |
264.172 |
US gallons |
|
weight (mass) |
|||
grams |
0.03527 |
ounces, avoirdupois |
|
grams |
0.03215 |
ounces, troy |
|
kilograms |
2.20462 |
pounds, avoirdupois |
|
metric quintals (q) |
220.462 |
pounds, avoirdupois |
|
tonnes |
2,204.62 |
pounds, avoirdupois |
|
tonnes |
1.10231 |
short tons |
|
tonnes |
0.984207 |
long tons |
|
|
|
|
|
velocity and fuel consumption |
|||
kilometres/hour |
0.62137 |
miles/hour |
|
kilometres/hour |
0.53996 |
international knots |
|
kilometres/litre |
2.82481 |
miles/UK gallon |
|
litres/100 kilometresc |
0.00354 |
UK gallons/mile |
|
litres/100 kilometresc |
0.00425 |
US gallons/mile |
|
|
|
|
|
Temperature |
|||
degrees Celsius |
9/5 and add 32degrees Fahrenheit |
||
|
|
|
|
37°C |
equals |
98.6°F |
|
50°C |
equals |
122°F |
|
100°C |
equals |
212°F |
|
a Between the UK and US systems, and the International System of Units (SI). As an example of the use of the table, 10 long tons (of 2,240lb each), multiplied by 1.12, is equal to 11.2 short tons (of 2,000lb each).
b Miles per UK gallon, divided into 282.481, gives litres per 100 kilometres; miles per US gallon, divided into 235.215, gives litres per 100 kilometres.
c Litres per 100 kilometres, divided into 282.481, gives miles per UK gallon; litres per 100 kilometres, divided into 235.215, gives miles per US gallon.