Imperial to Metric Volume Chart
In 1824, the various different gallons in use in the British Empire were replaced by the imperial gallon, a unit close in volume to the ale gallon.
It was originally defined as the volume of 10 pounds (4.5 kg) of distilled water weighed in air with brass weights with the barometer standing at 30 inches of mercury (102 kPa) at a temperature of 62 °F (17 °C). In 1963, the gallon was redefined as the volume of 10 pounds of distilled water of density 0.998859 g/mL weighed in air of density 0.001217 g/mLagainst weights of density 8.136 g/mL, which works out to 4.546096 L or 277.4198 cu in.
The Weights and Measures Act of 1985 switched to a gallon of exactly 4.54609 L (approximately 277.4194 cu in).
Table of volume units
Unit  Imperial ounce  Imperial pint  Millilitres  Cubic inches  US ounces  US pints 

fluid ounce (fl oz)  1  1/20  28.4130625  1.7339  0.96076  0.060047 
gill (gi)  5  1/4  142.0653125  8.6694  4.8038  0.30024 
pint (pt)  20  1  568.26125  34.677  19.215  1.2009 
quart (qt)  40  2  1,136.5225  69.355  38.430  2.4019 
gallon (gal)  160  8  4,546.09  277.42  153.72  9.6076 
Note: The millilitre equivalences are exact, but cubicinch and US measures are correct to 5 significant figures. 
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