| imperial barrel | 1 bl (imp) | 2 bl (imp) | 3 bl (imp) | 4 bl (imp) | 5 bl (imp) | 6 bl (imp) | 7 bl (imp) | 8 bl (imp) | 9 bl (imp) | 10 bl (imp) | 11 bl (imp) | 12 bl (imp) | 13 bl (imp) | 14 bl (imp) | 15 bl (imp) | 16 bl (imp) | 17 bl (imp) | 18 bl (imp) | 19 bl (imp) | 20 bl (imp) | 21 bl (imp) | 22 bl (imp) | 23 bl (imp) | 24 bl (imp) | 25 bl (imp) | 26 bl (imp) | 27 bl (imp) | 28 bl (imp) | 29 bl (imp) | 30 bl (imp) | 31 bl (imp) | 32 bl (imp) | 33 bl (imp) | 34 bl (imp) | 35 bl (imp) | 36 bl (imp) | 37 bl (imp) | 38 bl (imp) | 39 bl (imp) | 40 bl (imp) | 41 bl (imp) | 42 bl (imp) | 43 bl (imp) | 44 bl (imp) | 45 bl (imp) | 46 bl (imp) | 47 bl (imp) | 48 bl (imp) | 49 bl (imp) | 50 bl (imp) | 51 bl (imp) | 52 bl (imp) | 53 bl (imp) | 54 bl (imp) | 55 bl (imp) | 56 bl (imp) | 57 bl (imp) | 58 bl (imp) | 59 bl (imp) | 60 bl (imp) | 61 bl (imp) | 62 bl (imp) | 63 bl (imp) | 64 bl (imp) | 65 bl (imp) | 66 bl (imp) | 67 bl (imp) | 68 bl (imp) | 69 bl (imp) | 70 bl (imp) | 71 bl (imp) | 72 bl (imp) | 73 bl (imp) | 74 bl (imp) | 75 bl (imp) | 76 bl (imp) | 77 bl (imp) | 78 bl (imp) | 79 bl (imp) | 80 bl (imp) | 81 bl (imp) | 82 bl (imp) | 83 bl (imp) | 84 bl (imp) | 85 bl (imp) | 86 bl (imp) | 87 bl (imp) | 88 bl (imp) | 89 bl (imp) | 90 bl (imp) | 91 bl (imp) | 92 bl (imp) | 93 bl (imp) | 94 bl (imp) | 95 bl (imp) | 96 bl (imp) | 97 bl (imp) | 98 bl (imp) | 99 bl (imp) | 100 bl (imp) |
| US legal cup | 681.9135 c (US Legal) | 1,363.827 c (US Legal) | 2,045.7405 c (US Legal) | 2,727.654 c (US Legal) | 3,409.5675 c (US Legal) | 4,091.481 c (US Legal) | 4,773.3945 c (US Legal) | 5,455.308 c (US Legal) | 6,137.2215 c (US Legal) | 6,819.135 c (US Legal) | 7,501.0485 c (US Legal) | 8,182.962 c (US Legal) | 8,864.8755 c (US Legal) | 9,546.789 c (US Legal) | 10,228.7025 c (US Legal) | 10,910.616 c (US Legal) | 11,592.5295 c (US Legal) | 12,274.443 c (US Legal) | 12,956.3565 c (US Legal) | 13,638.27 c (US Legal) | 14,320.1835 c (US Legal) | 15,002.097 c (US Legal) | 15,684.0105 c (US Legal) | 16,365.924 c (US Legal) | 17,047.8375 c (US Legal) | 17,729.751 c (US Legal) | 18,411.6645 c (US Legal) | 19,093.578 c (US Legal) | 19,775.4915 c (US Legal) | 20,457.405 c (US Legal) | 21,139.3185 c (US Legal) | 21,821.232 c (US Legal) | 22,503.1455 c (US Legal) | 23,185.059 c (US Legal) | 23,866.9725 c (US Legal) | 24,548.886 c (US Legal) | 25,230.7995 c (US Legal) | 25,912.713 c (US Legal) | 26,594.6265 c (US Legal) | 27,276.54 c (US Legal) | 27,958.4535 c (US Legal) | 28,640.367 c (US Legal) | 29,322.2805 c (US Legal) | 30,004.194 c (US Legal) | 30,686.1075 c (US Legal) | 31,368.021 c (US Legal) | 32,049.9345 c (US Legal) | 32,731.848 c (US Legal) | 33,413.7615 c (US Legal) | 34,095.675 c (US Legal) | 34,777.5885 c (US Legal) | 35,459.502 c (US Legal) | 36,141.4155 c (US Legal) | 36,823.329 c (US Legal) | 37,505.2425 c (US Legal) | 38,187.156 c (US Legal) | 38,869.0695 c (US Legal) | 39,550.983 c (US Legal) | 40,232.8965 c (US Legal) | 40,914.81 c (US Legal) | 41,596.7235 c (US Legal) | 42,278.637 c (US Legal) | 42,960.5505 c (US Legal) | 43,642.464 c (US Legal) | 44,324.3775 c (US Legal) | 45,006.291 c (US Legal) | 45,688.2045 c (US Legal) | 46,370.118 c (US Legal) | 47,052.0315 c (US Legal) | 47,733.945 c (US Legal) | 48,415.8585 c (US Legal) | 49,097.772 c (US Legal) | 49,779.6855 c (US Legal) | 50,461.599 c (US Legal) | 51,143.5125 c (US Legal) | 51,825.426 c (US Legal) | 52,507.3395 c (US Legal) | 53,189.253 c (US Legal) | 53,871.1665 c (US Legal) | 54,553.08 c (US Legal) | 55,234.9935 c (US Legal) | 55,916.907 c (US Legal) | 56,598.8205 c (US Legal) | 57,280.734 c (US Legal) | 57,962.6475 c (US Legal) | 58,644.561 c (US Legal) | 59,326.4745 c (US Legal) | 60,008.388 c (US Legal) | 60,690.3015 c (US Legal) | 61,372.215 c (US Legal) | 62,054.1285 c (US Legal) | 62,736.042 c (US Legal) | 63,417.9555 c (US Legal) | 64,099.869 c (US Legal) | 64,781.7825 c (US Legal) | 65,463.696 c (US Legal) | 66,145.6095 c (US Legal) | 66,827.523 c (US Legal) | 67,509.4365 c (US Legal) | 68,191.35 c (US Legal) |
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 legal cups | imperial barrels | US legal cups |
|---|---|---|---|
| 1 | = 681.9135 | 6 | = 4091.481 |
| 2 | = 1363.827 | 7 | = 4773.3945 |
| 3 | = 2045.7405 | 8 | = 5455.308 |
| 4 | = 2727.654 | 9 | = 6137.2215 |
| 5 | = 3409.5675 | 10 | = 6819.135 |
The cup currently used in the United States for nutrition labelling is defined in United States law as 240 ml.
| 1 U.S. "legal" cup | = | 240 | millilitres |
| = | 16 | international tablespoons | |
| = | 12 | Australian tablespoons | |
| ≈ | 8.12 | U.S. customary fluid ounces | |
| ≈ | 8.45 | imperial fluid ounces |
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| US legal cup | c (US Legal) | ≡ 240 mL | = 2.4×10−4 m3 | Imperial/US |
| US legal cups | imperial barrels | US legal cups | imperial barrels |
|---|---|---|---|
| 1 | = 0.0014664616553273 | 6 | = 0.0087987699319635 |
| 2 | = 0.0029329233106545 | 7 | = 0.010265231587291 |
| 3 | = 0.0043993849659818 | 8 | = 0.011731693242618 |
| 4 | = 0.005865846621309 | 9 | = 0.013198154897945 |
| 5 | = 0.0073323082766363 | 10 | = 0.014664616553273 |
| imperial barrels | US legal cups |
|---|---|
| 1 | = 681.9135 |
| 0.0014665 | = 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 …) |