Volume calculator

Imperial Gallons to US Gallons Converter

Convert imperial gallons (imp gal) to us gallons (gal) with the exact volume formula, worked examples, and a common-values table.

About these units

imp gal
Imperial gallon, also called a UK gallon, is a volume unit equal to exactly 4.54609 liters. It is different from the US liquid gallon, so gallon-only source data must be checked before converting.
gal
US gallon, a liquid volume unit equal to exactly 3.785411784 liters. It is smaller than an imperial gallon, so US gallon and UK gallon results are not interchangeable.
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FAQ8 common questions for this calculator.

FAQs

How do I convert imperial gallons to us gallons?+

Use this formula: gal = imp gal × 1.20094993. Enter the imp gal value and the calculator applies the relationship immediately.

How many gal are in 1 imp gal?+

1 imp gal equals 1.20094993 gal.

What is 10 imp gal in gal?+

10 imp gal equals 12.0094993 gal. The displayed result may be rounded, while the calculator keeps full precision internally.

Can I convert us gallons back to imperial gallons?+

Yes. Use Swap in the converter to reverse the units and calculate gal to imp gal.

How does the Imperial Gallons to US Gallons Converter calculate the result?+

For the Imperial Gallons to US Gallons Converter, it uses the Imperial Gallons to us gallons formula: gal = imp gal × 1.20094993. 1 imp gal equals 1.20094993 gal. 10 imp gal equals 12.0094993 gal.

What information do I need to use the Imperial Gallons to US Gallons Converter?+

Enter the values requested by the form, keep units consistent, and use the displayed assumptions to decide whether the Imperial Gallons to US Gallons Converter matches your scenario.

How accurate is the Imperial Gallons to US Gallons Converter?+

Imperial Gallons to US Gallons Converter is accurate for the values and assumptions entered on this page. It uses the Imperial Gallons to us gallons formula. Recheck the inputs before relying on the estimate.

What should I check before using the Imperial Gallons to US Gallons Converter result?+

For the Imperial Gallons to US Gallons Converter, check that the units, inputs, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.

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Volume guide

How to use the Imperial Gallons to US Gallons Converter

Convert imperial gallons (imp gal) to us gallons (gal) with the exact volume formula, worked examples, and a common-values table. Use the instant result for the imperial gallons to us gallons conversion, then check the common-value table, reverse link, and unit notes before copying the answer.

  1. 1

    Enter Imperial Gallons

    Type the imperial gallons value you want to convert. Decimal values work when you need a partial unit.

  2. 2

    Read US Gallons

    Use the main result for the exact us gallons value, then scan the common-value table for nearby reference points.

  3. 3

    Confirm Imperial Gallons to US Gallons

    Confirm that imperial gallons and us gallons are the units you need. Some kitchen, package, and ingredient conversions depend on whether the source is weight, volume, or density-based.