Volume conversion
Imperial gallon to Liter converter
Convert imp gal to L instantly, choose the displayed precision, and verify the result with the formula and reference table below.
Liter (L)
Rounded for display only; calculations retain full precision.
Rounding and precision rules
- Convr calculates first and rounds the displayed result only once, at the final step.
- The default is a maximum of 6 decimal places; trailing zeros are removed.
- Very small values that would appear as zero, and values of 10¹² or more, use scientific notation.
- Display precision is not measurement uncertainty. For scientific, engineering, or regulated work, retain only the digits justified by the source measurement.
Practical context
Understanding this conversion
Converting Imperial gallons to liters is useful for interpreting British fuel-economy data, older vehicle manuals, storage tanks, and liquid quantities for an international metric audience.
The factor 4.54609 is exact, so additional digits are not required. Keep the unit label with the result to prevent it from being mistaken for a US-gallon conversion.
Reviewed August 16, 2026.
Calculation
Imperial gallon to Liter formula
L = imp gal × 4.54609
Calculations retain full precision and the result is rounded only for display.
Worked example
For 10 imp gal, the result is 45.4609 L. Substitute 10 imp gal into the formula to obtain 45.4609 L.
A numerical value expressed in liter is usually larger than the same measurement expressed in imperial gallon, because 1 imp gal equals 4.54609 L.
Imperial gallon to Liter reference table
Common values rounded to a maximum of 6 decimal places.
| Imperial gallon (imp gal) | Liter (L) |
|---|---|
| 1 imp gal | 4.54609 L |
| 5 imp gal | 22.73045 L |
| 10 imp gal | 45.4609 L |
| 50 imp gal | 227.3045 L |
| 100 imp gal | 454.609 L |
Understanding the units
About Imperial gallon and Liter
Imperial gallon (imp gal)
One imperial gallon (imp gal) equals 4.54609 L, the base relationship used for this volume conversion.
Liter (L)
Liter (L) is the base unit used by Convr for volume calculations.
When this conversion is useful
Imperial gallon to Liter conversion is useful for recipes, beverage quantities, fuel volumes, laboratory measurements, and container capacities. It lets you compare the same volume or capacity across documents, tools, or standards that use different units.
Learn with Convr
Conversion guides
Metric vs Imperial Units: A Practical Comparison
Understand how metric, US customary, and Imperial units differ, where each system is used, and how to convert between them reliably.
Read guide →Everyday conversionsUS Gallons vs Imperial Gallons: What Is the Difference?
Compare US liquid gallons and Imperial gallons, understand their exact liter values, and avoid common fuel and recipe conversion errors.
Read guide →Answers at a glance
Frequently asked questions
Is one Imperial gallon exactly 4.54609 liters?
Yes. The Imperial gallon is defined as exactly 4.54609 cubic decimeters, equivalent to 4.54609 liters.
Can I use this factor for American gallons?
No. One US liquid gallon equals 3.785411784 liters and has its own conversion page.
How does Convr round Imperial gallon to Liter results?
Convr keeps full numeric precision during the calculation and rounds only the displayed result. The default is a maximum of 6 decimal places, with selectable precision on this page.
Can I convert negative or decimal imperial gallon values?
Yes. The converter accepts positive, negative, decimal, and scientific-notation values. Negative values are physically meaningful for some scales, such as temperature, but not for every measured quantity.
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