Cubic metric volume unit.
Cubic Centimeters to Imperial gallons Converter — cm3 to imp gal
Convert Cubic Centimeter (cm3) to Imperial gallon (imp gal) using the exact conversion factor (1 cubic centimeter = 0.0002199692 imperial gallon). See the formula, worked examples, conversion table, history, and common uses.
Cubic Centimeters to Imperial gallons converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
An imperial gallon is exactly 4.54609 liters.
Result = input x 1e-6 / 0.00454609.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic Centimeters to Imperial gallons
Cubic Centimeter and Imperial gallon appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Specifically: Cubic metric volume unit, and an imperial gallon is exactly 4.54609 liters.
Formula
imperial gallons = cubic centimeters × 0.000219969248299
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic centimeter equals 0.000001 base units, and 1 imperial gallon equals 0.00454609 base units, so dividing one by the other gives the direct cubic centimeter-to-imperial gallon factor of 0.000219969248299.
Simple example
1 cm3 × 0.0002199692483 = 0.0002199692 imp gal
1 cubic centimeter = 0.0002199692 imperial gallons.
Real-world example
10 cm3 × 0.0002199692483 = 0.0021996925 imp gal
10 cubic centimeters = 0.0021996925 imperial gallons.
Conversion table
| Cubic Centimeter (cm3) | Imperial gallon (imp gal) |
|---|---|
| 1 cm3 | 0.0002199692 imp gal |
| 5 cm3 | 0.0010998462 imp gal |
| 10 cm3 | 0.0021996925 imp gal |
| 25 cm3 | 0.0054992312 imp gal |
| 50 cm3 | 0.0109984624 imp gal |
| 100 cm3 | 0.0219969248 imp gal |
Reverse conversion: Imperial gallon to Cubic Centimeter
0.0002199692 imp gal × 4546.09 = 0.9999997804 cm3
0.0002199692 imperial gallons = 0.9999997804 cubic centimeters.
cubic centimeters = imperial gallons × 4546.09
For a page dedicated to this direction, see Imperial gallon to Cubic Centimeter.
Understanding the Cubic Centimeter (cm3)
Cubic metric volume unit.
Understanding the Imperial gallon
Imperial gallon (imp gal) measures volume. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom, Canada (some contexts), and other Commonwealth countries
Imperial gallon vs. US gallon. Britain's 1824 Weights and Measures Act defined a new gallon based on 10 pounds of water, replacing the old wine gallon the US had already adopted — leaving the US (3.785 L) and imperial (4.546 L) gallons about 20% apart today.
Uses of the Imperial gallon today
- UK fuel and beverage measurement (historically; UK now primarily uses liters for retail)
- Commonwealth country liquid measurement in some contexts
History of the Imperial gallon
The imperial gallon was created by Britain's Weights and Measures Act of 1824, defined as the volume of 10 pounds of water, replacing several inconsistent older English gallon definitions (wine gallon, ale gallon, corn gallon) with one standard.
Historical origin. Imperial gallon was not the invention of a single named person; it developed through the process described above.
Imperial gallon — sources
- UK Weights and Measures Act 1824 — Establishes the imperial gallon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial gallons are in 1 cubic centimeter?
1 cubic centimeter equals 0.0002199692 imperial gallons, using the exact defined conversion factor rather than an estimate.
How do I convert cubic centimeter to imperial gallon?
Multiply the cubic centimeter value by 0.0002199692483. The converter above does this instantly to whatever precision you set.
How do I convert imperial gallon back to cubic centimeter?
Use the reverse factor: 1 imperial gallon equals 4,546.09 cubic centimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic centimeter?
Cubic Centimeter (cm3) is a unit of volume.
What is a imperial gallon?
Imperial gallon (imp gal) measures volume. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. It is classified as a UK/imperial customary unit.
Is the cubic centimeter to imperial gallon conversion exact?
Yes. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between imperial gallon vs. us gallon?
Britain's 1824 Weights and Measures Act defined a new gallon based on 10 pounds of water, replacing the old wine gallon the US had already adopted — leaving the US (3.785 L) and imperial (4.546 L) gallons about 20% apart today.