Imperial Gallons to US Liquid Gallons Converter
Convert Imperial gallons to US liquid gallons instantly with this free Imperial gallons to US liquid gallons converter. Enter any value to get an accurate volume conversion, plus the formula, the conversion factor and a full reference table.
What is 1 Imperial gallon in US liquid gallons?
1 Imperial gallon is equal to 1.20094993 US liquid gallons.
1 × 1.20094993 = 1.20094993 US liquid gallons
1 Imperial gallon = 1.200949926 US liquid gallons
Imperial gallons to US liquid gallons formula
gal = imp gal × 1.20094993
The Imperial gallons to US liquid gallons conversion factor is 1.2009499255, which is exact by definition. 1 Imperial gallon = 1.2009499255 US liquid gallons, and 1 US liquid gallon = 0.832674184629 Imperial gallons.
Regional note. Gallons differ by region. A US liquid gallon is exactly 3.785411784 liters; an Imperial (UK) gallon is exactly 4.54609 liters — about 20% larger. This page uses the US liquid gallon.
Worked examples
- 2 Imperial gallons = 2.40189985 US liquid gallons — 2 × 1.20094993 = 2.40189985 US liquid gallons
- 6 Imperial gallons = 7.20569955 US liquid gallons — 6 × 1.20094993 = 7.20569955 US liquid gallons
- 10 Imperial gallons = 12.0094993 US liquid gallons — 10 × 1.20094993 = 12.0094993 US liquid gallons
Imperial gallons to US liquid gallons conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| Imperial gallons (imp gal) | US liquid gallons (gal) |
|---|---|
| 1 imp gal | 1.2009499 gal |
| 2 imp gal | 2.4018999 gal |
| 3 imp gal | 3.6028498 gal |
| 4 imp gal | 4.8037997 gal |
| 5 imp gal | 6.0047496 gal |
| 6 imp gal | 7.2056996 gal |
| 7 imp gal | 8.4066495 gal |
| 8 imp gal | 9.6075994 gal |
| 9 imp gal | 10.808549 gal |
| 10 imp gal | 12.009499 gal |
| 12 imp gal | 14.411399 gal |
| 15 imp gal | 18.014249 gal |
| 20 imp gal | 24.018999 gal |
| 25 imp gal | 30.023748 gal |
| 30 imp gal | 36.028498 gal |
| 50 imp gal | 60.047496 gal |
| 75 imp gal | 90.071244 gal |
| 100 imp gal | 120.09499 gal |
| 500 imp gal | 600.47496 gal |
| 1,000 imp gal | 1,200.9499 gal |
When you need to convert Imperial gallons to US liquid gallons
- Scaling recipes between metric millilitres and US cups, pints or fluid ounces.
- Comparing fuel prices and tank capacities between countries.
- Working out paint, fertiliser or pool chemical quantities from instructions written for another market.
Getting a feel for the scale
A converted number is easier to trust when you can picture it. These reference points let you sanity-check the result at a glance.
Imperial gallon (imp gal)
- An Imperial gallon is about 1.2 US gallons
- UK fuel prices are quoted per litre, not per gallon
US liquid gallon (gal)
- A US milk jug is 1 gallon
- A mid-size car tank holds 12–16 US gallons
Common mistakes to avoid
- Dividing when you should multiply. Because 1 Imperial gallon = 1.20095 US liquid gallons, the answer should be larger than the number you started with.
- Mixing US and Imperial liquid measures. The Imperial gallon and pint are about 20% larger than their US counterparts, which is enough to ruin a recipe or misstate fuel economy.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
Cooking tolerates rounding to the nearest 5 mL or quarter cup. Dosing, chemistry and pool treatment do not — keep the full converted value there.
How these units are defined
- Imperial gallon (imp gal): Exactly 4.54609 liters — the gallon used in the UK and historically in Canada. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- US liquid gallon (gal): Exactly 3.785411784 liters — the gallon used in the United States. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
- US liquid gallons to Imperial gallons
- Imperial gallons to Milliliters
- Imperial gallons to Liters
- Imperial gallons to Cubic meters
- Imperial gallons to Cubic feet
- Imperial gallons to US teaspoons
- Imperial gallons to US tablespoons
- Imperial gallons to US fluid ounces
- Imperial gallons to US cups
- Imperial gallons to US liquid pints
- Imperial gallons to US liquid quarts
- Imperial gallons to Imperial pints
Frequently asked questions
- What is 1 Imperial gallon in US liquid gallons?
- 1 Imperial gallon is equal to 1.20094993 US liquid gallons.
- How many Imperial gallons are in one US liquid gallon?
- There are 0.832674185 Imperial gallons in 1 US liquid gallon.
- How do you convert Imperial gallons to US liquid gallons?
- Multiply the number of Imperial gallons by 1.20094993 — or use the formula gal = imp gal × 1.20094993.
- What is 6 Imperial gallons in US liquid gallons?
- 6 Imperial gallons is 7.20569955 US liquid gallons. 6 × 1.20094993 = 7.20569955 US liquid gallons.
- Is the Imperial gallons to US liquid gallons conversion exact?
- Yes. The relationship is fixed by definition, so 1.2009499255 is an exact conversion factor — only the displayed result is rounded.
- Does this use US or Imperial US liquid gallons?
- Gallons differ by region. A US liquid gallon is exactly 3.785411784 liters; an Imperial (UK) gallon is exactly 4.54609 liters — about 20% larger. This page uses the US liquid gallon.