Imperial Gallons to US Gallons
1 imperial gallon = 1.20095 us gallons (gal)
Convert imperial gallons to us gallons instantly. 1 imperial gallon = 1.20095 us gallons. Free, accurate, with conversion table and formula.
Imperial Gallon (imp gal)
US Gallon (gal)
| Unit | 1 imp gal equals |
|---|---|
| Milliliter (ml) | 4,546.09 |
| Liter (L) | 4.54609 |
| Cubic Meter (m³) | 0.00454609 |
| Cubic Centimeter (cm³) | 4,546.09 |
| US Teaspoon (tsp) | 922.33 |
| US Tablespoon (tbsp) | 307.442 |
| US Fluid Ounce (fl oz) | 153.722 |
| US Cup (cup) | 18.942 |
| US Pint (pt) | 9.60761 |
| US Quart (qt) | 4.8038 |
| US Gallon (gal) | 1.20095 |
| Imperial Gallon (imp gal) | 1 |
How to convert imperial gallons to us gallons
- 1Take your value in imperial gallons (imp gal).
- 2Multiply by 1.20095.
- 3The result is your value in us gallons (gal).
Imperial Gallons to US Gallons conversion table
| Imperial Gallons (imp gal) | US Gallons (gal) |
|---|---|
| 1 | 1.20095 |
| 2 | 2.4019 |
| 5 | 6.00475 |
| 10 | 12.0095 |
| 25 | 30.0238 |
| 50 | 60.0475 |
| 100 | 120.095 |
| 250 | 300.238 |
| 500 | 600.475 |
| 1,000 | 1,200.95 |
Frequently asked
How many us gallons are in a imperial gallon?
1 imperial gallon equals 1.20095 us gallons (gal).
How do I convert imperial gallons to us gallons?
Multiply the number of imperial gallons by 1.20095 to get us gallons.
What is 10 imperial gallons in us gallons?
10 imp gal equals 12.01 gal.
What is 100 imperial gallons in us gallons?
100 imp gal equals 120.1 gal.
How do I convert us gallons back to imperial gallons?
Multiply us gallons by 0.832674 (the reciprocal) or use the swap button above.
Where you'll actually use this
Volume measures three-dimensional capacity — how much liquid a container holds or how much space an object occupies. Metric uses liters and milliliters; imperial uses gallons, quarts, pints, cups, and fluid ounces.
- Cooking
US recipes use cups and tablespoons; metric recipes use ml. A US cup is 236.6 ml — not 250 ml as in metric cups.
- Fuel
Pump prices show gallons in the US, liters almost everywhere else.
- Beverages
A US fluid ounce (29.57 ml) is slightly smaller than a UK fluid ounce (28.41 ml).
Common mistakes to avoid
- US gallon ≠ UK gallon
A US gallon is 3.785 L, a UK (imperial) gallon is 4.546 L — about 20% larger.
- Cups aren't universal
US cup = 236.6 ml. UK cup = 284 ml. Metric cup = 250 ml. Match the recipe origin.
Did you know?
At 4 °C exactly one liter of pure water weighs one kilogram — the original metric definition.
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