UK Gallons to Cubic Inches (imp gal to in³) Converter
1 UK gallon (imp gal) = 277.419 cubic inches (in³). To convert UK gallons to cubic inches, multiply by 277.419: 25 imp gal × 277.419 = 6,935.49 in³.
Quick facts
- 1 imp gal = 277.419 in³
- 1 in³ = 0.00360465 imp gal
- Formula: in³ = imp gal × 277.419
- Quick estimate: multiply by about 277
How to convert UK gallons to cubic inches
- Write down the number of UK gallons you have.
- Multiply it by 277.419 (the number of cubic inches in one UK gallon).
- Check the answer: it should be larger than the number you started with.
Worked example: 25 imp gal × 277.419 = 6935.49 in³.
To convert cubic inches back to UK gallons, multiply by 0.00360465, or divide by 277.419.
Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).
UK Gallons to Cubic Inches conversion table
| UK Gallons [imp gal] | Cubic Inches [in³] |
|---|---|
| 0.01 imp gal | 2.7741943279 in³ |
| 0.1 imp gal | 27.7419432792 in³ |
| 1 imp gal | 277.4194327916 in³ |
| 2 imp gal | 554.8388655832 in³ |
| 3 imp gal | 832.2582983749 in³ |
| 5 imp gal | 1387.0971639581 in³ |
| 10 imp gal | 2774.1943279162 in³ |
| 20 imp gal | 5548.3886558324 in³ |
| 50 imp gal | 13870.9716395811 in³ |
| 100 imp gal | 27741.9432791622 in³ |
| 1000 imp gal | 277419.4327916215 in³ |
imp gal to in³ chart from 1 to 100
- 1 imp gal 277.419 in³
- 2 imp gal 554.839 in³
- 3 imp gal 832.258 in³
- 4 imp gal 1109.68 in³
- 5 imp gal 1387.1 in³
- 6 imp gal 1664.52 in³
- 7 imp gal 1941.94 in³
- 8 imp gal 2219.36 in³
- 9 imp gal 2496.77 in³
- 10 imp gal 2774.19 in³
- 11 imp gal 3051.61 in³
- 12 imp gal 3329.03 in³
- 13 imp gal 3606.45 in³
- 14 imp gal 3883.87 in³
- 15 imp gal 4161.29 in³
- 16 imp gal 4438.71 in³
- 17 imp gal 4716.13 in³
- 18 imp gal 4993.55 in³
- 19 imp gal 5270.97 in³
- 20 imp gal 5548.39 in³
- 25 imp gal 6935.49 in³
- 30 imp gal 8322.58 in³
- 35 imp gal 9709.68 in³
- 40 imp gal 11096.8 in³
- 45 imp gal 12483.9 in³
- 50 imp gal 13871 in³
- 55 imp gal 15258.1 in³
- 60 imp gal 16645.2 in³
- 65 imp gal 18032.3 in³
- 70 imp gal 19419.4 in³
- 75 imp gal 20806.5 in³
- 80 imp gal 22193.6 in³
- 85 imp gal 23580.7 in³
- 90 imp gal 24967.7 in³
- 95 imp gal 26354.8 in³
- 100 imp gal 27741.9 in³
Cubic Inches to UK Gallons conversion table
| Cubic Inches [in³] | UK Gallons [imp gal] |
|---|---|
| 0.01 in³ | 0.0000360465 imp gal |
| 0.1 in³ | 0.000360465 imp gal |
| 1 in³ | 0.0036046501 imp gal |
| 2 in³ | 0.0072093003 imp gal |
| 3 in³ | 0.0108139504 imp gal |
| 5 in³ | 0.0180232507 imp gal |
| 10 in³ | 0.0360465015 imp gal |
| 20 in³ | 0.072093003 imp gal |
| 50 in³ | 0.1802325075 imp gal |
| 100 in³ | 0.360465015 imp gal |
| 1000 in³ | 3.6046501499 imp gal |
UK Gallons vs Cubic Inches
| UK Gallon | Cubic Inch | |
|---|---|---|
| Symbol | imp gal | in³ |
| Equals | 1 imp gal = 277.419 in³ | 1 in³ = 0.00360465 imp gal |
What is a UK gallon?
The imperial gallon, defined as exactly 4.54609 litres (UK Weights and Measures Act 1985); about 20% larger than the US gallon. Used in the UK and Canada for fuel economy (miles per gallon), garden and aquarium volumes, and older fuel prices.
What is a cubic inch?
The volume of a cube with 1-inch sides. Used in the US for small mechanical parts and engine displacement.
Where You Will Meet UK Gallons and Cubic Inches
UK gallons are used mainly in the UK (pub pints, fuel economy in mpg) and older Canadian recipes, while cubic inches are used mainly in the United States. Because the two units come from different systems, Americans, Britons and Canadians often need it when buying from each other online, following each other's recipes or instructions, or filling in official forms.
How big is 1 imp gal compared with 1 in³?
1 imp gal is 277.419 times the size of 1 in³, so the number gets bigger when you convert UK gallons to cubic inches.
UK Gallons to Cubic Inches without a calculator
- In your head: multiply by 300 (about 8.1% off). 10 imp gal × 300 ≈ 3000 in³.
- Closer estimate: multiply by 280 (within 0.93%).
Real-world imp gal to in³ examples
| Example | UK Gallons | Cubic Inches |
|---|---|---|
| One imperial gallon | 1 imp gal | 277.419 in³ |
| A small aquarium | 10 imp gal | 2774.19 in³ |
| A garden water butt | 45 imp gal | 12483.9 in³ |
| A 350 cubic-inch V8 engine | 1.26163 imp gal | 350 in³ |
| One US gallon | 0.832674 imp gal | 231 in³ |
How exact is the imp gal to in³ factor?
The factor is exact by definition, so any error comes only from rounding. Keep at least 4 significant figures for school work, and the full factor for anything legal or commercial.
Mistakes to avoid
- This page uses the imperial (UK) measure. A US measure with the same name is smaller, so make sure your source is British or older Canadian.
- Volume factors are the cube of length factors, so a small rounding error in the length becomes three times larger in the volume.
Background on UK gallons and cubic inches
The imperial gallon was introduced in 1824 and is defined as exactly 4.54609 litres.
Related conversions
People who convert uk gallons to cubic inches often need us gallons to cubic inches, uk gallons to liters and uk gallons to us gallons. The full volume converter lists every unit.
On pakmath.com, the scientific calculator is a useful next step, as is the percentage calculator; our sister site Adzita has a fuel cost calculator.
Frequently asked questions
How many cubic inches are in a UK gallon?
There are 277.419 cubic inches in 1 UK gallon (1 imp gal = 277.4194327916 in³).
How many UK gallons are in a cubic inch?
There are 0.00360465 UK gallons in 1 cubic inch (1 in³ = 0.0036046501 imp gal).
How do I convert UK gallons to cubic inches?
Use in³ = imp gal × 277.419. So 10 imp gal becomes 2,774.19 in³; for the reverse, multiply by 0.00360465.
What is 10 imp gal in cubic inches?
10 imp gal = 2,774.19 in³.
What is 100 imp gal in cubic inches?
100 imp gal = 27,741.9 in³.
Is the conversion exact?
Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.
What is an easy way to convert UK gallons to cubic inches?
In your head: multiply by 300 (about 8.1% off). 10 imp gal × 300 ≈ 3000 in³.
How many cubic inches is 10 imp gal (a small aquarium)?
10 imp gal = 2774.19 in³.
How many UK gallons is one US gallon (231 in³)?
231 in³ = 0.832674 imp gal.
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