| US liquid gallon | 1 US gal lqd | 2 US gal lqd | 3 US gal lqd | 4 US gal lqd | 5 US gal lqd | 6 US gal lqd | 7 US gal lqd | 8 US gal lqd | 9 US gal lqd | 10 US gal lqd | 11 US gal lqd | 12 US gal lqd | 13 US gal lqd | 14 US gal lqd | 15 US gal lqd | 16 US gal lqd | 17 US gal lqd | 18 US gal lqd | 19 US gal lqd | 20 US gal lqd | 21 US gal lqd | 22 US gal lqd | 23 US gal lqd | 24 US gal lqd | 25 US gal lqd | 26 US gal lqd | 27 US gal lqd | 28 US gal lqd | 29 US gal lqd | 30 US gal lqd | 31 US gal lqd | 32 US gal lqd | 33 US gal lqd | 34 US gal lqd | 35 US gal lqd | 36 US gal lqd | 37 US gal lqd | 38 US gal lqd | 39 US gal lqd | 40 US gal lqd | 41 US gal lqd | 42 US gal lqd | 43 US gal lqd | 44 US gal lqd | 45 US gal lqd | 46 US gal lqd | 47 US gal lqd | 48 US gal lqd | 49 US gal lqd | 50 US gal lqd | 51 US gal lqd | 52 US gal lqd | 53 US gal lqd | 54 US gal lqd | 55 US gal lqd | 56 US gal lqd | 57 US gal lqd | 58 US gal lqd | 59 US gal lqd | 60 US gal lqd | 61 US gal lqd | 62 US gal lqd | 63 US gal lqd | 64 US gal lqd | 65 US gal lqd | 66 US gal lqd | 67 US gal lqd | 68 US gal lqd | 69 US gal lqd | 70 US gal lqd | 71 US gal lqd | 72 US gal lqd | 73 US gal lqd | 74 US gal lqd | 75 US gal lqd | 76 US gal lqd | 77 US gal lqd | 78 US gal lqd | 79 US gal lqd | 80 US gal lqd | 81 US gal lqd | 82 US gal lqd | 83 US gal lqd | 84 US gal lqd | 85 US gal lqd | 86 US gal lqd | 87 US gal lqd | 88 US gal lqd | 89 US gal lqd | 90 US gal lqd | 91 US gal lqd | 92 US gal lqd | 93 US gal lqd | 94 US gal lqd | 95 US gal lqd | 96 US gal lqd | 97 US gal lqd | 98 US gal lqd | 99 US gal lqd | 100 US gal lqd |
| imperial barrel | 0.0231298 bl (imp) | 0.0462597 bl (imp) | 0.0693895 bl (imp) | 0.0925194 bl (imp) | 0.1156492 bl (imp) | 0.1387790 bl (imp) | 0.1619089 bl (imp) | 0.1850387 bl (imp) | 0.2081685 bl (imp) | 0.2312984 bl (imp) | 0.2544282 bl (imp) | 0.2775581 bl (imp) | 0.3006879 bl (imp) | 0.3238177 bl (imp) | 0.3469476 bl (imp) | 0.3700774 bl (imp) | 0.3932073 bl (imp) | 0.4163371 bl (imp) | 0.4394669 bl (imp) | 0.4625968 bl (imp) | 0.4857266 bl (imp) | 0.5088564 bl (imp) | 0.5319863 bl (imp) | 0.5551161 bl (imp) | 0.5782460 bl (imp) | 0.6013758 bl (imp) | 0.6245056 bl (imp) | 0.6476355 bl (imp) | 0.6707653 bl (imp) | 0.6938952 bl (imp) | 0.7170250 bl (imp) | 0.7401548 bl (imp) | 0.7632847 bl (imp) | 0.7864145 bl (imp) | 0.8095443 bl (imp) | 0.8326742 bl (imp) | 0.8558040 bl (imp) | 0.8789339 bl (imp) | 0.9020637 bl (imp) | 0.9251935 bl (imp) | 0.9483234 bl (imp) | 0.9714532 bl (imp) | 0.9945831 bl (imp) | 1.0177129 bl (imp) | 1.0408427 bl (imp) | 1.0639726 bl (imp) | 1.0871024 bl (imp) | 1.1102322 bl (imp) | 1.1333621 bl (imp) | 1.1564919 bl (imp) | 1.1796218 bl (imp) | 1.2027516 bl (imp) | 1.2258814 bl (imp) | 1.2490113 bl (imp) | 1.2721411 bl (imp) | 1.2952710 bl (imp) | 1.3184008 bl (imp) | 1.3415306 bl (imp) | 1.3646605 bl (imp) | 1.3877903 bl (imp) | 1.4109201 bl (imp) | 1.4340500 bl (imp) | 1.4571798 bl (imp) | 1.4803097 bl (imp) | 1.5034395 bl (imp) | 1.5265693 bl (imp) | 1.5496992 bl (imp) | 1.5728290 bl (imp) | 1.5959589 bl (imp) | 1.6190887 bl (imp) | 1.6422185 bl (imp) | 1.6653484 bl (imp) | 1.6884782 bl (imp) | 1.7116080 bl (imp) | 1.7347379 bl (imp) | 1.7578677 bl (imp) | 1.7809976 bl (imp) | 1.8041274 bl (imp) | 1.8272572 bl (imp) | 1.8503871 bl (imp) | 1.8735169 bl (imp) | 1.8966468 bl (imp) | 1.9197766 bl (imp) | 1.9429064 bl (imp) | 1.9660363 bl (imp) | 1.9891661 bl (imp) | 2.0122959 bl (imp) | 2.0354258 bl (imp) | 2.0585556 bl (imp) | 2.0816855 bl (imp) | 2.1048153 bl (imp) | 2.1279451 bl (imp) | 2.1510750 bl (imp) | 2.1742048 bl (imp) | 2.1973347 bl (imp) | 2.2204645 bl (imp) | 2.2435943 bl (imp) | 2.2667242 bl (imp) | 2.2898540 bl (imp) | 2.3129838 bl (imp) |
The US gallon is legally defined as 231 cubic inches, which is exactly 3.785411784 liters. A US liquid gallon of water weighs about 8.34 pounds or 3.78 kilograms at 62 °F (17 °C), making it about 16.6% lighter than the imperial gallon. There are four quarts in a gallon, two pints in a quart and 16 US fluid ounces in a US pint, which makes the US fluid ounce equal to 1⁄128 of a US gallon. In order to overcome the effects of expansion and contraction with temperature when using a gallon to specify a quantity of material for purposes of trade, it is common to define the temperature at which the material will occupy the specified volume. For example, the volume of petroleum products and alcoholic beverages are both referenced to 60 °F (16 °C) in government regulations.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| US liquid gallon | US gal lqd | ≡ 231 cu in | ≡ 3.785411784×10−3 m3 | Imperial/US |
| US liquid gallons | imperial barrels | US liquid gallons | imperial barrels |
|---|---|---|---|
| 1 | = 0.023129838461916 | 6 | = 0.1387790307715 |
| 2 | = 0.046259676923833 | 7 | = 0.16190886923341 |
| 3 | = 0.069389515385749 | 8 | = 0.18503870769533 |
| 4 | = 0.092519353847665 | 9 | = 0.20816854615725 |
| 5 | = 0.11564919230958 | 10 | = 0.23129838461916 |
A barrel is one of several units of volume applied in various contexts; there are dry barrels, fluid barrels (such as the UK beer barrel and US beer barrel), oil barrels and so on. For historical reasons the volumes of some barrel units are roughly double the volumes of others; volumes in common usage range from about 100 to 200 litres (22 to 44 imp gal; 26 to 53 US gal). In many connections the term "drum" is used almost interchangeably with "barrel".
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| imperial barrel | bl (imp) | ≡ 36 gal (imp) | = 0.16365924 m3 | Imperial/US |
| imperial barrels | US liquid gallons | imperial barrels | US liquid gallons |
|---|---|---|---|
| 1 | = 43.234197318175 | 6 | = 259.40518390905 |
| 2 | = 86.46839463635 | 7 | = 302.63938122722 |
| 3 | = 129.70259195452 | 8 | = 345.8735785454 |
| 4 | = 172.9367892727 | 9 | = 389.10777586357 |
| 5 | = 216.17098659087 | 10 | = 432.34197318175 |
| US liquid gallons | imperial barrels |
|---|---|
| 1 | = 0.0231298 |
| 43.2341973 | = 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |