Convert Cubic Feet to Imperial Gallons
1 cubic foot (ft³) equals 6.228835459 imperial gallons (gal (imp)).
1 ft³ = 6.228835459 gal (imp)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk cubic foot to imperial gallon converter to paste a column from Excel.
How to Convert Cubic Foot to Imperial Gallon
- 1 ft³ = 6.228835459 gal (imp)
- 1 gal (imp) = 0.1605436532 ft³
- Example: convert 15 ft³ to gal (imp): 15 ft³ = 15 × 6.228835459 gal (imp) = 93.43253189 gal (imp)
Formula
gal (imp) = ft³ × 6.228835459043
Derivation from SI units:
- 1 ft³ = (0.3048 m)³ = 0.028316846592 m³
- 1 imp gal = 4.54609 L = 0.00454609 m³ (exact, by definition)
- 1 ft³ = 0.028316846592 m³ ÷ 0.00454609 m³ per gal (imp) = 6.228835459043 gal (imp)
Both units are defined exactly, so the factor is exact. Cubic Foot definition: cubic foot; Imperial Gallon definition: imperial gallon.
Worked examples
- A reading of 5 ft³ converts to 31.1441773 gal (imp).
5 ft³ × 6.228835459 = 31.1441773 gal (imp) - A value of 50 ft³ is 311.441773 gal (imp).
50 ft³ × 6.228835459 = 311.441773 gal (imp)
Cubic Foot to Imperial Gallon conversion table
| Cubic Feet (ft³) | Imperial Gallons (gal (imp)) |
|---|---|
| 0.1 ft³ | 0.6228835459 gal (imp) |
| 0.5 ft³ | 3.11441773 gal (imp) |
| 1 ft³ | 6.228835459 gal (imp) |
| 1.5 ft³ | 9.343253189 gal (imp) |
| 2 ft³ | 12.45767092 gal (imp) |
| 5 ft³ | 31.1441773 gal (imp) |
| 10 ft³ | 62.28835459 gal (imp) |
| 20 ft³ | 124.5767092 gal (imp) |
| 27 ft³ | 168.1785574 gal (imp) |
| 35.3147 ft³ | 219.9694556 gal (imp) |
| 50 ft³ | 311.441773 gal (imp) |
| 100 ft³ | 622.8835459 gal (imp) |
| 500 ft³ | 3114.41773 gal (imp) |
| 1000 ft³ | 6228.835459 gal (imp) |
| 10000 ft³ | 62288.35459 gal (imp) |
Where it's used
Cubic Feet are used for natural gas billing (ccf, Mcf), while imperial gallons appear in fuel economy in the UK (miles per gallon). Both measure volume (capacity), so the conversion is a fixed factor.
Cubic Foot to other volume units
| Conversion | 1 ft³ equals |
|---|---|
| cubic foot to cubic meter | 0.02831684659 m³ |
| cubic foot to liter | 28.31684659 L |
| cubic foot to milliliter | 28316.84659 mL |
| cubic foot to cubic centimeter | 28316.84659 cm³ |
| cubic foot to cubic inch | 1728 in³ |
| cubic foot to US gallon | 7.480519481 gal (US) |
| cubic foot to imperial gallon | 6.228835459 gal (imp) |
Frequently asked questions
How many imperial gallons are in 1 cubic foot?
1 ft³ = 6.228835459 gal (imp).
How do I convert cubic feet to imperial gallons?
Multiply the value in ft³ by 6.228835459. For example, 15 ft³ × 6.228835459 = 93.43253189 gal (imp).
Is the ft³ to gal (imp) conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "cubic foot (ft³)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "gallon [Canadian and U.K. (Imperial)]".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Cubic Feet to Imperial Gallons. Retrieved October 17, 2026, from https://scientificconverters.com/volume/cubic-feet-to-imperial-gallons/
IEEE
Scientific Converters, "Convert Cubic Feet to Imperial Gallons," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/volume/cubic-feet-to-imperial-gallons/