| imperial gallon | 1 gal (imp) | 2 gal (imp) | 3 gal (imp) | 4 gal (imp) | 5 gal (imp) | 6 gal (imp) | 7 gal (imp) | 8 gal (imp) | 9 gal (imp) | 10 gal (imp) | 11 gal (imp) | 12 gal (imp) | 13 gal (imp) | 14 gal (imp) | 15 gal (imp) | 16 gal (imp) | 17 gal (imp) | 18 gal (imp) | 19 gal (imp) | 20 gal (imp) | 21 gal (imp) | 22 gal (imp) | 23 gal (imp) | 24 gal (imp) | 25 gal (imp) | 26 gal (imp) | 27 gal (imp) | 28 gal (imp) | 29 gal (imp) | 30 gal (imp) | 31 gal (imp) | 32 gal (imp) | 33 gal (imp) | 34 gal (imp) | 35 gal (imp) | 36 gal (imp) | 37 gal (imp) | 38 gal (imp) | 39 gal (imp) | 40 gal (imp) | 41 gal (imp) | 42 gal (imp) | 43 gal (imp) | 44 gal (imp) | 45 gal (imp) | 46 gal (imp) | 47 gal (imp) | 48 gal (imp) | 49 gal (imp) | 50 gal (imp) | 51 gal (imp) | 52 gal (imp) | 53 gal (imp) | 54 gal (imp) | 55 gal (imp) | 56 gal (imp) | 57 gal (imp) | 58 gal (imp) | 59 gal (imp) | 60 gal (imp) | 61 gal (imp) | 62 gal (imp) | 63 gal (imp) | 64 gal (imp) | 65 gal (imp) | 66 gal (imp) | 67 gal (imp) | 68 gal (imp) | 69 gal (imp) | 70 gal (imp) | 71 gal (imp) | 72 gal (imp) | 73 gal (imp) | 74 gal (imp) | 75 gal (imp) | 76 gal (imp) | 77 gal (imp) | 78 gal (imp) | 79 gal (imp) | 80 gal (imp) | 81 gal (imp) | 82 gal (imp) | 83 gal (imp) | 84 gal (imp) | 85 gal (imp) | 86 gal (imp) | 87 gal (imp) | 88 gal (imp) | 89 gal (imp) | 90 gal (imp) | 91 gal (imp) | 92 gal (imp) | 93 gal (imp) | 94 gal (imp) | 95 gal (imp) | 96 gal (imp) | 97 gal (imp) | 98 gal (imp) | 99 gal (imp) | 100 gal (imp) |
| acre-foot | 3.6855751431564 × 10-6 ac ft | 7.3711502863128 × 10-6 ac ft | 1.1056725429469 × 10-5 ac ft | 1.4742300572626 × 10-5 ac ft | 1.8427875715782 × 10-5 ac ft | 2.2113450858938 × 10-5 ac ft | 2.5799026002095 × 10-5 ac ft | 2.9484601145251 × 10-5 ac ft | 3.3170176288407 × 10-5 ac ft | 3.6855751431564 × 10-5 ac ft | 4.054132657472 × 10-5 ac ft | 4.4226901717877 × 10-5 ac ft | 4.7912476861033 × 10-5 ac ft | 5.1598052004189 × 10-5 ac ft | 5.5283627147346 × 10-5 ac ft | 5.8969202290502 × 10-5 ac ft | 6.2654777433659 × 10-5 ac ft | 6.6340352576815 × 10-5 ac ft | 7.0025927719971 × 10-5 ac ft | 7.3711502863128 × 10-5 ac ft | 7.7397078006284 × 10-5 ac ft | 8.108265314944 × 10-5 ac ft | 8.4768228292597 × 10-5 ac ft | 8.8453803435753 × 10-5 ac ft | 9.213937857891 × 10-5 ac ft | 9.5824953722066 × 10-5 ac ft | 9.9510528865222 × 10-5 ac ft | 0.0001032 ac ft | 0.0001069 ac ft | 0.0001106 ac ft | 0.0001143 ac ft | 0.0001179 ac ft | 0.0001216 ac ft | 0.0001253 ac ft | 0.0001290 ac ft | 0.0001327 ac ft | 0.0001364 ac ft | 0.0001401 ac ft | 0.0001437 ac ft | 0.0001474 ac ft | 0.0001511 ac ft | 0.0001548 ac ft | 0.0001585 ac ft | 0.0001622 ac ft | 0.0001659 ac ft | 0.0001695 ac ft | 0.0001732 ac ft | 0.0001769 ac ft | 0.0001806 ac ft | 0.0001843 ac ft | 0.0001880 ac ft | 0.0001916 ac ft | 0.0001953 ac ft | 0.0001990 ac ft | 0.0002027 ac ft | 0.0002064 ac ft | 0.0002101 ac ft | 0.0002138 ac ft | 0.0002174 ac ft | 0.0002211 ac ft | 0.0002248 ac ft | 0.0002285 ac ft | 0.0002322 ac ft | 0.0002359 ac ft | 0.0002396 ac ft | 0.0002432 ac ft | 0.0002469 ac ft | 0.0002506 ac ft | 0.0002543 ac ft | 0.0002580 ac ft | 0.0002617 ac ft | 0.0002654 ac ft | 0.0002690 ac ft | 0.0002727 ac ft | 0.0002764 ac ft | 0.0002801 ac ft | 0.0002838 ac ft | 0.0002875 ac ft | 0.0002912 ac ft | 0.0002948 ac ft | 0.0002985 ac ft | 0.0003022 ac ft | 0.0003059 ac ft | 0.0003096 ac ft | 0.0003133 ac ft | 0.0003170 ac ft | 0.0003206 ac ft | 0.0003243 ac ft | 0.0003280 ac ft | 0.0003317 ac ft | 0.0003354 ac ft | 0.0003391 ac ft | 0.0003428 ac ft | 0.0003464 ac ft | 0.0003501 ac ft | 0.0003538 ac ft | 0.0003575 ac ft | 0.0003612 ac ft | 0.0003649 ac ft | 0.0003686 ac ft |
The imperial (UK) gallon, now defined as exactly 4.54609 litres (about 277.42 cubic inches), is used in some Commonwealth countries and was originally based on the volume of 10 pounds (approximately 4.54 kg) of water at 62 °F (17 °C). The imperial fluid ounce is defined as 1⁄160 of an imperial gallon; there are four quarts in a gallon, two pints in a quart, and 20 Imperial fluid ounces in an imperial pint.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| imperial gallon | gal (imp) | ≡ 4.54609 L | ≡ 4.54609×10−3 m3 | Imperial/US |
| imperial gallons | acre-feet | imperial gallons | acre-feet |
|---|---|---|---|
| 1 | = 3.6855751431564E-6 | 6 | = 2.2113450858938E-5 |
| 2 | = 7.3711502863128E-6 | 7 | = 2.5799026002095E-5 |
| 3 | = 1.1056725429469E-5 | 8 | = 2.9484601145251E-5 |
| 4 | = 1.4742300572626E-5 | 9 | = 3.3170176288407E-5 |
| 5 | = 1.8427875715782E-5 | 10 | = 3.6855751431564E-5 |
The acre-foot is a unit of volume commonly used in the United States in reference to large-scale water resources, such as reservoirs, aqueducts, canals, sewer flow capacity, irrigation water, and river flows.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| acre-foot | ac ft | ≡ 1 ac x 1 ft = 43560 cu ft | = 1233.48183754752 m3 | Imperial/US |
| acre-feet | imperial gallons | acre-feet | imperial gallons |
|---|---|---|---|
| 1 | = 271328.07259591 | 6 | = 1627968.4355754 |
| 2 | = 542656.14519181 | 7 | = 1899296.5081713 |
| 3 | = 813984.21778772 | 8 | = 2170624.5807672 |
| 4 | = 1085312.2903836 | 9 | = 2441952.6533631 |
| 5 | = 1356640.3629795 | 10 | = 2713280.7259591 |
| imperial gallons | acre-feet |
|---|---|
| 1 | = 3.6855751431564 × 10-6 |
| 271,328.0725959 | = 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 …) |