Unit Conversions & Measures
US Liquid Gallons to Imperial Gallons Converter
Convert US liquid gallons to imperial gallons with the exact factor, the working shown step by step and a plain-English explanation.
Your inputs
Change any value to update the result instantly.
Imperial Gallons
83.267418 imp gal
Conversion factor
1 US gal = 0.8326741846 imp gal
Value in cubic meter (internal base unit)
0.37854118 m³
Reverse conversion check
83.267418 imp gal = 100 US gal
Rounded for everyday use
83.27 imp gal
The US liquid gallon is 231 cubic inches — smaller than the imperial gallon. The imperial gallon is 4.54609 litres, about 20% larger than the US gallon. This conversion crosses the US customary and imperial systems, which share unit names but not always the same size.
What this calculator does
Converts a measurement given in US liquid gallons into imperial gallons using the defined conversion factor.
What your result means
The same quantity expressed in imp gal instead of US gal. Nothing about the measurement itself changes.
Formula and working
imp gal = US gal × 0.8326741846
- 1
Start with your value
100 US gal
- 2
Convert to cubic meter
100 × 0.0037854118 = 0.37854118 m³
- 3
Convert into imperial gallons
0.37854118 ÷ 0.00454609 = 83.267418 imp gal
- 4
Result
100 US gal = 83.267418 imp gal
Frequently asked questions
Symbols and assumptions
- US gal
- Input unit — US liquid gallon
- imp gal
- Output unit — imperial gallon
- m³
- Base unit used internally for volume and capacity
- • Both units measure volume and capacity, so the physical quantity is unchanged by the conversion.
- • The relationship is exactly linear: 1 US gal = 0.8326741846 imp gal.
- • Values are converted through the SI base unit for this quantity rather than pair by pair.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • A unit conversion changes how a number is expressed, not how it was measured — the answer can never be more accurate than the value entered.
- • The US liquid gallon is 231 cubic inches — smaller than the imperial gallon.
- • The imperial gallon is 4.54609 litres, about 20% larger than the US gallon.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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