Cubic feet to Imperial gallons Converter
Convert Cubic feet (ft³) to Imperial gallons (imp gal) instantly, or use the conversion table below to look up common values.
Cubic feet to Imperial gallons conversion table
| Cubic feet (ft³) | Imperial gallons (imp gal) |
|---|---|
| 1 | 6.228835 |
| 2 | 12.457671 |
| 3 | 18.686506 |
| 4 | 24.915342 |
| 5 | 31.144177 |
| 10 | 62.288355 |
| 25 | 155.720886 |
| 50 | 311.441773 |
| 100 | 622.883546 |
How to convert Cubic feet to Imperial gallons
1 ft³ equals 6.228835 imp gal. Use the converter above for any value, or read the table for common conversions.
imp gal = ft³ × 6.228835459042825 · ft³ = imp gal × 0.16054365323589206Multiply a cubic feet figure by 6.228835 to get imperial gallons, or divide it by 0.160544 to go the other way.
Worked examples
- 1 ft³= 6.228835 imp gal
- 2 ft³= 12.457671 imp gal
- 5 ft³= 31.144177 imp gal
- 10 ft³= 62.288355 imp gal
- 20 ft³= 124.576709 imp gal
What these units are
Cubic feet (ft³). A cubic foot is 28.316846592 liters, and the volume of a cube one foot on each side. It is used for gas meters, freight and the capacity of appliances and containers.
Imperial gallons (imp gal). An imperial gallon is 4.54609 liters, about 20% more than a US gallon. It is the traditional UK and Commonwealth liquid unit, now largely replaced by liters.
US and imperial units are kept separate because they are genuinely different sizes. Confirm which system a source means before trusting a converted figure.
Converting Cubic feet to Imperial gallons in practice
Working in cubic feet
A cubic foot is the volume of a cube with edges one foot long, exactly 28.316846592 liters or 0.028316846592 cubic meters. It is a unit of volume, not of area.
Shipping containers, natural gas, water supply, refrigeration and timber are measured in cubic feet in the United States and parts of the freight trade. Appliance capacities also use it.
The cubic foot is defined through the foot, so its liter value is exact at 28.316846592. Only the displayed result is rounded, and a value taken to cubic meters and back may return with the final digit changed.
The error is confusing a cubic foot with a square foot or with a foot; volume needs three dimensions. Another is using the cubic foot where a liquid measure such as the liter or gallon is expected.
Cubic feet and cubic meters divide the same volume on different scales, and liters appear on appliance and gas labels. One cubic meter is about 35.3 cubic feet, so a figure copied between them without conversion is wrong by more than thirtyfold.
Checking a cubic feet to imperial gallons conversion
The metric volume units are a clean decimal chain around the liter, so liters to milliliters is a shift of three places and cubic meters to liters is a shift of three the other way. Those pairs a reader can do without a converter.
Every pair that names a US or imperial liquid unit has to go through the definition first, because three of these units differ from a metric unit by amounts too large to round away: a liter is not a quart, a gallon is 3.785411784 liters in the US system and 4.54609 in the imperial one, and a US fluid ounce is not an imperial fluid ounce.
When checking a volume conversion, convert into liters and out again, or measure the container. The mistake that survives every other check is reading a US measure as the imperial unit of the same name, which changes a recipe, a fuel figure or a tank size by about a fifth.
Tanzania reference points
Real quantities, converted into the units on this page.
The 20-litre bucket or canister used to carry water in Tanzania
20 L = 0.706293 ft³ = 4.399385 imp gal
WaterAid puts the minimum daily water need per person at 20 litres, so one container is roughly one person's daily requirement.
Source: IPS News — water access in Tanzania, citing WaterAid · verified 2026-09-14
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