| 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) |
| pipe | 0.3431286 pipe | 0.6862571 pipe | 1.0293857 pipe | 1.3725142 pipe | 1.7156428 pipe | 2.0587713 pipe | 2.4018999 pipe | 2.7450284 pipe | 3.0881570 pipe | 3.4312855 pipe | 3.7744141 pipe | 4.1175426 pipe | 4.4606712 pipe | 4.8037997 pipe | 5.1469283 pipe | 5.4900568 pipe | 5.8331854 pipe | 6.1763139 pipe | 6.5194425 pipe | 6.8625710 pipe | 7.2056996 pipe | 7.5488281 pipe | 7.8919567 pipe | 8.2350852 pipe | 8.5782138 pipe | 8.9213423 pipe | 9.2644709 pipe | 9.6075994 pipe | 9.9507280 pipe | 10.2938565 pipe | 10.6369851 pipe | 10.9801136 pipe | 11.3232422 pipe | 11.6663707 pipe | 12.0094993 pipe | 12.3526278 pipe | 12.6957564 pipe | 13.0388849 pipe | 13.3820135 pipe | 13.7251420 pipe | 14.0682706 pipe | 14.4113991 pipe | 14.7545277 pipe | 15.0976562 pipe | 15.4407848 pipe | 15.7839133 pipe | 16.1270419 pipe | 16.4701704 pipe | 16.8132990 pipe | 17.1564275 pipe | 17.4995561 pipe | 17.8426846 pipe | 18.1858132 pipe | 18.5289417 pipe | 18.8720703 pipe | 19.2151988 pipe | 19.5583274 pipe | 19.9014559 pipe | 20.2445845 pipe | 20.5877130 pipe | 20.9308416 pipe | 21.2739701 pipe | 21.6170987 pipe | 21.9602272 pipe | 22.3033558 pipe | 22.6464843 pipe | 22.9896129 pipe | 23.3327414 pipe | 23.6758700 pipe | 24.0189985 pipe | 24.3621271 pipe | 24.7052556 pipe | 25.0483842 pipe | 25.3915127 pipe | 25.7346413 pipe | 26.0777698 pipe | 26.4208984 pipe | 26.7640269 pipe | 27.1071555 pipe | 27.4502840 pipe | 27.7934126 pipe | 28.1365411 pipe | 28.4796697 pipe | 28.8227982 pipe | 29.1659268 pipe | 29.5090553 pipe | 29.8521839 pipe | 30.1953124 pipe | 30.5384410 pipe | 30.8815695 pipe | 31.2246981 pipe | 31.5678266 pipe | 31.9109552 pipe | 32.2540837 pipe | 32.5972123 pipe | 32.9403408 pipe | 33.2834694 pipe | 33.6265979 pipe | 33.9697265 pipe | 34.3128550 pipe |
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 | pipes | imperial barrels | pipes |
|---|---|---|---|
| 1 | = 0.34312855014424 | 6 | = 2.0587713008655 |
| 2 | = 0.68625710028849 | 7 | = 2.4018998510097 |
| 3 | = 1.0293856504327 | 8 | = 2.745028401154 |
| 4 | = 1.372514200577 | 9 | = 3.0881569512982 |
| 5 | = 1.7156427507212 | 10 | = 3.4312855014424 |
The pipe was a measure of liquid volume equalling two hogsheads. This equated to 108 imperial gallons (490 l) for ale or 126 imperial gallons (570 l) for wine (also known as a butt).
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| pipe | ≡ 126 gal (wine) | = 0.476961884784 m3 | Imperial/US |
| pipes | imperial barrels | pipes | imperial barrels |
|---|---|---|---|
| 1 | = 2.9143596462015 | 6 | = 17.486157877209 |
| 2 | = 5.8287192924029 | 7 | = 20.40051752341 |
| 3 | = 8.7430789386044 | 8 | = 23.314877169612 |
| 4 | = 11.657438584806 | 9 | = 26.229236815813 |
| 5 | = 14.571798231007 | 10 | = 29.143596462015 |
| imperial barrels | pipes |
|---|---|
| 1 | = 0.3431286 |
| 2.9143596 | = 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 …) |