Instant, two-way conversion across common engineering units.
1 US gal = 0.83267418 imp gal(US gallon → Imperial gallon)
To convert US gallons to imperial gallons, multiply the value by 0.83267418. Volume conversions matter for concrete pours, excavation, tank capacity and airflow, where a rounding slip becomes a delivery error.
The US gallon is the liquid volume unit used in the United States.
The imperial gallon is the UK liquid volume unit and is about 20 percent larger than the US gallon.
1 US gal equals 0.83267418 imp gal.
Multiply the value by 0.83267418. For example, 10 US gal equals 8.3267418 imp gal.
1 imp gal equals 1.2009499 US gal. The converter above works in both directions, so you can type into either field.
The US gallon comes from the old English wine gallon of 231 cubic inches, while the imperial gallon was redefined in 1824. The imperial gallon is about 20 percent larger.
Cubic meters are the standard ordering unit for concrete and excavation in metric practice; cubic yards serve the same role in the US.
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