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Volume

gal (US)togal (UK)

Convert US gallons (gal (US)) to imperial gallons (gal (UK)).

Factor1 gal (US) = 0.8326742 gal (UK)

Converter

gal (US)

Accepts numbers or expressions, e.g. 150 + 14.7

Result
83.2674gal (UK)

Rendered to 6 significant figures.

Formula

Formula
gal (UK) = gal (US) × 0.8326742

Multiply any value in US gallons by 0.8326742 to obtain the value in imperial gallons.

Worked example

Convert 100 gal (US) to gal (UK).

  1. 01Start with 100 gal (US).
  2. 02Multiply by the conversion factor: 100 × 0.8326742 = 83.2674 gal (UK).
Result100 gal (US) = 83.2674 gal (UK)

Conversion table

gal (US)gal (UK)
10.83267
21.6653
54.1634
108.3267
2016.653
5041.634
10083.267
200166.53
500416.34
1000832.67

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gal (US) to gal (UK)?
1 gal (US) equals 0.8326742 gal (UK). To convert, multiply the value in US gallons by 0.8326742.
How do I convert 1 gal (US) to gal (UK)?
1 gal (US) = 0.832674 gal (UK). For any value, multiply by 0.8326742.
How do I convert gal (UK) back to gal (US)?
Divide by the same factor — or equivalently, multiply by 1.20095. So 1 gal (UK) = 1.20095 gal (US).
When would I need to convert US gallon to imperial gallon?
Volume conversions are used for tank sizing, batch calculations, and bridging between vendor specs (gallons, barrels, ft³) and process documentation (m³, litres).
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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