Convert Cubic centimetres to Imperial gallons
1 cubic centimetre is 0.00022 gal (UK). One cubic centimetre is exactly 0.000219969248299 imperial gallons.
One cubic centimetre is 2.1997 × 10^-4 imperial gallons. To convert cubic centimetres to imperial gallons, multiply by 2.1997 × 10^-4; to go the other way, divide by 2.1997 × 10^-4 or multiply by 4546.09. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130. A thousandth of a litre, which makes it exactly a millilitre — the same volume under two names.
Factor checked against the defining standard · How we check
- Cubic centimetres × 2.1997 × 10^-4
1 * 0.000220 gal (UK)
1 cubic centimetre in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 0.2028841362 tsp | × 0.202884136211 |
| US tablespoons | 0.0676280454 tbsp | × 0.0676280454037 |
| US fluid ounces | 0.0338140227 fl oz | × 0.0338140227018 |
| US cups | 0.004226752838 cup | × 0.00422675283773 |
| US pints | 0.002113376419 pt | × 0.00211337641887 |
| US quarts | 0.001056688209 qt | × 0.00105668820943 |
| US gallons | 0.0002641720524 gal | × 0.000264172052358 |
| milliliters | 1 ml | × 1 |
| liters | 0.001 L | × 0.001 |
| imperial gallons | 0.0002199692483 gal (UK) | × 0.000219969248299 |
| imperial quarts | 0.0008798769932 qt (UK) | × 0.000879876993196 |
| imperial pints | 0.001759753986 pt (UK) | × 0.00175975398639 |
| imperial fluid ounces | 0.03519507973 fl oz (UK) | × 0.0351950797279 |
| imperial gills | 0.007039015946 gi (UK) | × 0.00703901594557 |
| cubic millimetres | 1,000 mm³ | × 1,000 |
| cubic centimetres (as entered) | 1 cm³ | — |
| cubic inches | 0.06102374409 in³ | × 0.0610237440947 |
| cubic feet | 0.00003531466672 ft³ | × 0.0000353146667215 |
| cubic yards | 0.000001307950619 yd³ | × 0.00000130795061931 |
| cubic metres | 0.000001 m³ | × 0.000001 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert cubic centimetres to imperial gallons? The converter and the working
- 1.Take the measurement in cubic centimetres.
- 2.Multiply by 2.1997 × 10^-4 — that is how many imperial gallons fit in one cubic centimetre.
- 3.To go back the other way, divide by 2.1997 × 10^-4, or multiply by 4546.09.
Worked example: 25 cubic centimetres to imperial gallons
- Formula
- cm³ × 2.1997 × 10^-4 = gal (UK)
- Arithmetic
- 25 × 2.1997 × 10^-4 = 0.01 gal (UK)
- Answer
- 25 cm³ = 0.01 gal (UK)
The factor is rounded for display; the figure above is computed from the full value.
Cubic centimetres to imperial gallons conversion table
| Cubic centimetres | Imperial gallons |
|---|---|
| 1 cm³ | 0.00022 gal (UK) |
| 2 cm³ | 0.0004399 gal (UK) |
| 3 cm³ | 0.0006599 gal (UK) |
| 4 cm³ | 0.0008799 gal (UK) |
| 5 cm³ | 0.0011 gal (UK) |
| 6 cm³ | 0.00132 gal (UK) |
| 7 cm³ | 0.00154 gal (UK) |
| 8 cm³ | 0.00176 gal (UK) |
| 9 cm³ | 0.00198 gal (UK) |
| 10 cm³ | 0.0022 gal (UK) |
| 12 cm³ | 0.00264 gal (UK) |
| 15 cm³ | 0.0033 gal (UK) |
| 20 cm³ | 0.004399 gal (UK) |
| 25 cm³ | 0.01 gal (UK) |
| 50 cm³ | 0.01 gal (UK) |
| 100 cm³ | 0.02 gal (UK) |
| 200 cm³ | 0.04 gal (UK) |
| 300 cm³ | 0.07 gal (UK) |
| 500 cm³ | 0.11 gal (UK) |
| 1000 cm³ | 0.22 gal (UK) |
| 2000 cm³ | 0.44 gal (UK) |
| 5000 cm³ | 1.1 gal (UK) |
| 10000 cm³ | 2.2 gal (UK) |
What is a cubic centimetre?
A thousandth of a litre, which makes it exactly a millilitre — the same volume under two names. Engine displacement uses cc and medicine uses ml for the identical quantity.
What is an imperial gallon?
Exactly 4.54609 liters since 1985, and the reason UK and US fuel economy figures cannot be compared: it is 20% larger than the US gallon, so 40 mpg in Britain is about 33 mpg in America on the same car.
How many imperial gallons are in a cubic centimetre?
One cubic centimetre is 2.1997 × 10^-4 imperial gallons. Going the other way, one imperial gallon is 4546.09 cubic centimetres. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a cubic centimetre.
Cite this page
- APA
- Rule Calculator. (2026). Convert Cubic centimetres to imperial gallons. Rule Calculator. https://rulecalculators.com/convert/cubic-centimeter-to-imperial-gallon
- MLA
- "Convert Cubic centimetres to imperial gallons." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/cubic-centimeter-to-imperial-gallon.
- Chicago
- Rule Calculator. "Convert Cubic centimetres to imperial gallons." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/cubic-centimeter-to-imperial-gallon.
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Questions people actually ask
- How many imperial gallons are in a cubic centimetre?
- 2.1997 × 10^-4. Exactly 4.54609 liters since 1985, and the reason UK and US fuel economy figures cannot be compared: it is 20% larger than the US gallon, so 40 mpg in Britain is about 33 mpg in America on the same car.
- How do I convert imperial gallons back to cubic centimetres?
- Divide by 2.1997 × 10^-4, or multiply by 4546.09 — they are the same operation.
Other volume conversions
Imperial gallons to cubic centimetres — the same conversion the other way.