Convert Imperial Gallons to Cubic Meters
1 imperial gallon (gal (imp)) equals 0.00454609 cubic meters (m³).
1 gal (imp) = 0.00454609 m³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk imperial gallon to cubic meter converter to paste a column from Excel.
How to Convert Imperial Gallon to Cubic Meter
- 1 gal (imp) = 0.00454609 m³
- 1 m³ = 219.9692483 gal (imp)
- Example: convert 15 gal (imp) to m³: 15 gal (imp) = 15 × 0.00454609 m³ = 0.06819135 m³
Formula
m³ = gal (imp) × 0.00454609
or m³ = gal (imp) ÷ 219.9692482991
Derivation from SI units:
- 1 imp gal = 4.54609 L = 0.00454609 m³ (exact, by definition)
- 1 m³ = 1 m × 1 m × 1 m
Both units are defined exactly, so the factor is exact. Imperial Gallon definition: imperial gallon; Cubic Meter definition: cubic meter.
Worked examples
- A reading of 5 gal (imp) converts to 0.02273045 m³.
5 gal (imp) × 0.00454609 = 0.02273045 m³ - A value of 25 gal (imp) is 0.11365225 m³.
25 gal (imp) × 0.00454609 = 0.11365225 m³
Imperial Gallon to Cubic Meter conversion table
| Imperial Gallons (gal (imp)) | Cubic Meters (m³) |
|---|---|
| 0.25 gal (imp) | 0.0011365225 m³ |
| 0.5 gal (imp) | 0.002273045 m³ |
| 1 gal (imp) | 0.00454609 m³ |
| 2 gal (imp) | 0.00909218 m³ |
| 5 gal (imp) | 0.02273045 m³ |
| 10 gal (imp) | 0.0454609 m³ |
| 15 gal (imp) | 0.06819135 m³ |
| 20 gal (imp) | 0.0909218 m³ |
| 25 gal (imp) | 0.11365225 m³ |
| 40 gal (imp) | 0.1818436 m³ |
| 50 gal (imp) | 0.2273045 m³ |
| 100 gal (imp) | 0.454609 m³ |
| 1000 gal (imp) | 4.54609 m³ |
Where it's used
Imperial Gallons are used for fuel economy in the UK (miles per gallon), while cubic meters appear in water and gas metering. Both measure volume (capacity), so the conversion is a fixed factor.
Imperial Gallon to other volume units
| Conversion | 1 gal (imp) equals |
|---|---|
| imperial gallon to cubic meter | 0.00454609 m³ |
| imperial gallon to liter | 4.54609 L |
| imperial gallon to milliliter | 4546.09 mL |
| imperial gallon to cubic centimeter | 4546.09 cm³ |
| imperial gallon to cubic foot | 0.1605436532 ft³ |
| imperial gallon to cubic inch | 277.4194328 in³ |
| imperial gallon to US gallon | 1.200949926 gal (US) |
Frequently asked questions
How many cubic meters are in 1 imperial gallon?
1 gal (imp) = 0.00454609 m³.
How do I convert imperial gallons to cubic meters?
Multiply the value in gal (imp) by 0.00454609, or divide it by 219.9692483. For example, 15 gal (imp) × 0.00454609 = 0.06819135 m³.
Is the gal (imp) to m³ conversion exact?
Yes. Both units are defined exactly, and 1 gal (imp) is exactly 0.00454609 m³.
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, "gallon [Canadian and U.K. (Imperial)]".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2, coherent derived units.
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 Imperial Gallons to Cubic Meters. Retrieved October 17, 2026, from https://scientificconverters.com/volume/imperial-gallons-to-cubic-meters/
IEEE
Scientific Converters, "Convert Imperial Gallons to Cubic Meters," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/volume/imperial-gallons-to-cubic-meters/