Convert Cubic inches to imperial gallons
1 cubic inch = 0.00360465 imperial gallons · imp gal = in³ ÷ 277.4194328
When you need this conversion
This conversion goes from cubic inches, used for engine displacement and small volumes, to imperial gallons, the UK volume unit about 20 percent larger than a US gallon. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.
Cubic inches to imperial gallons conversion table
| Cubic inches (in³) | Imperial gallons (imp gal) |
|---|---|
| 1 in³ | 0.00360465 imp gal |
| 2 in³ | 0.0072093 imp gal |
| 3 in³ | 0.010814 imp gal |
| 5 in³ | 0.018023 imp gal |
| 10 in³ | 0.036047 imp gal |
| 15 in³ | 0.05407 imp gal |
| 20 in³ | 0.072093 imp gal |
| 25 in³ | 0.090116 imp gal |
| 50 in³ | 0.180233 imp gal |
| 75 in³ | 0.270349 imp gal |
| 100 in³ | 0.360465 imp gal |
| 250 in³ | 0.901163 imp gal |
| 500 in³ | 1.8023 imp gal |
| 1,000 in³ | 3.6047 imp gal |
The formula
imp gal = in³ ÷ 277.4194328Because both units measure volume, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.
Convert the other way
Imperial gallons to cubic inches →Related volume conversions
- Milliliters to US cups
- Milliliters to US fluid ounces
- Liters to cubic meters
- Liters to US gallons
- Cubic meters to liters
- Cubic meters to cubic feet
- Cubic feet to cubic meters
- US gallons to liters
- US cups to milliliters
- US fluid ounces to milliliters
- Milliliters to imperial gallons
- Liters to imperial gallons
Frequently asked questions
- How many imperial gallons are in a cubic inch?
- There are 0.00360465 imperial gallons in 1 cubic inch. The formula is imp gal = in³ ÷ 277.4194328.
- How do you convert cubic inches to imperial gallons?
- Use the formula imp gal = in³ ÷ 277.4194328. For example, 10 cubic inches equals 0.036047 imperial gallons.
- Is the cubic inches to imperial gallons conversion exact?
- Yes. Cubic inches and imperial gallons are both units of volume, related by an exact defined factor. Displayed results are rounded for readability.
- What is in³ short for?
- in³ is the standard symbol for cubic inch. imp gal is the symbol for imperial gallon.