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US Gallon to Imperial Gallon Converter

Convert US gallons to UK imperial gallons. Divide by 1.20095—US gal is smaller. For fuel specs and import comparisons.

How to Convert Us gallon to Imperial gallon

Divide US gallons by 1.20095 (1 US gal ≈ 0.8327 imp gal).

Conversion Formula:

value / 1.20095

Conversion Examples

Example: 6 US gal to imp gal

  1. 6 ÷ 1.20095 ≈ 5 imp gal

6 US gal ≈ 5 imp gal

US gallon is smaller.

Example: 20 US gal to imp gal

  1. 20 ÷ 1.20095 ≈ 16.65 imp gal

20 US gal ≈ 16.65 imp gal

Tank capacity comparison.

Conversion Chart

Us gallonImperial gallon
10.8327
21.6653
32.498
43.3307
54.1634
64.996
75.8287
86.6614
97.4941
108.3267
1512.4901
2016.6535
3024.9802
6049.9604
10083.2674

Conversion Formula

Divide US gallons by **1.20095** for imperial gallons.

Quick Conversion Tip

US gal ÷ 1.2 ≈ imp gal. Example: 12 US gal ≈ 10 imp gal.

Unit Definitions

US Gallon (gal)

A US gallon is the standard gallon used in the United States for liquids such as gasoline, milk, and water.

1 US gallon = 3.78541 liters = 231 cubic inches = 16 US cups

Imperial Gallon (imp gal)

An imperial gallon is a UK unit of volume historically used for fuel and beverages, larger than the US gallon.

1 imperial gallon = 4.54609 liters ≈ 1.20095 US gallons = 160 imperial fluid ounces

Common Use Cases

  • US fuel prices vs UK imperial gallon specs.
  • Vehicle import and tank label conversion.
  • Beverage and brewing volume (US vs UK).
  • Travel fuel planning between countries.

Understanding the Conversion

1 US gallon ≈ 0.833 imperial gallons. Divide US gal by 1.20095.

Example: 12 US gal ≈ 10 imp gal. Use when reading UK fuel or tank labels from US gallon figures.

Multiply imperial gallons by 1.20095 for US gallons.

FAQs

How many imperial gallons in one US gallon?

About 0.8327 imperial gallons.

How do I convert US gal to imp gal?

Divide US gallons by 1.20095.

Is a US gallon smaller than imperial?

Yes—US is ~3.785 L; imperial is ~4.546 L.