# Arithmetic/Geometry » Imperial and US units

Check converting units to learn about converting metric units.

### Temperature

In the US and a few other countries temperature is measured in degrees Fahrenheit.
In science the Kelvin scale is used for measuring temperature.
With the following formulas you can convert between the different units.
F = 1.8C + 32
F = 1.8K – 459.67
C = 59(F – 32)
C = K – 273.15
K = 59(F + 459.67)
K = C + 273.15

### Length

 1 inch (in) = 112 feet = 2.54 cm 1 foot (ft) = = 30.48 cm 1 yard (yd) = 3 feet = 91.44 cm 1 mile (mi) = 5280 feet = 160 934.4 cm = 1.609 344 km

### Area

1 acre = 4046.856 422 400 m2

### Volume (International/Imperial)

1 fluid ounce (fl oz) = 28.413 062 5 ml

 1 pint (pt) = 20 fluid ounces = 568.261 25 ml 1 quart (qt) = 40 fluid ounces = 1136.522 5 ml 1 gallon (gal) = 160 fluid ounces = 4546.09 ml

### Volume (US wet/US liquid)

1 US fluid ounce (fl oz) = 29.573 529 562 5 ml

 1 US pint (pt) = 16 US fluid ounces = 473.176 473 ml 1 US quart (qt) = 32 US fluid ounces = 946.352 946 ml 1 US gallon (gal) = 128 US fluid ounces = 3785.411 784 ml 1 barrel (bbl) = 31.5 US gallons = 119 240.471 196 ml 1 oil barrel (bbl) = 42 US gallons = 158 987.294 928 ml

### Weight (Avoirdupois)

 1 ounce (oz) = 116 pounds = 28.349 523 125 grams 1 pound (lb) = = 453.592 37 grams 1 stone (st) = 14 pounds = 6350.293 18 grams 1 (long) ton (t) = 2240 pounds = 1 016 046.908 8 grams 1 (short) ton (t) = 2000 pounds = 907 184.74 grams (used in US and Canada)

### Weight (Troy)

1 pennyweight (dwt) = 1.555 173 84 grams

 1 troy ounce (oz t) = 20 pennyweights = 31.103 476 8 grams 1 troy pound (lb t) = 240 pennyweights = 373.241 721 6 grams

### Other units

1 carat (CD) = 0.2 grams
1 (metric) ton (t) = 1000 kilograms
Speed of light, light year and astronomical unit? Check astronomical measurements.