Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
Imperial gallons to Cubic metres Converter
1 imp gal = 0.00454609 m³. Enter a value to convert imp gal to m³, then use the formula and table below. Displayed digits may be rounded.
VolumeInstant result
Decimals
Formula result = input × 4.54609 ÷ 1000. 1 imp gal ≈ 0.0045 m³
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Litres4.5461 L
Millilitres4,546.09 mL
Cubic metres0.0045 m³
Cubic centimetres4,546.09 cm³
US gallons1.2009 US gal
US quarts4.8038 qt
US cups19.2152 cup
US fluid ounces153.7216 fl oz
Conversion table
| imp gal | m³ |
|---|---|
| 1 imp gal | 0.0045 m³ |
| 2 imp gal | 0.0091 m³ |
| 5 imp gal | 0.0227 m³ |
| 10 imp gal | 0.0455 m³ |
| 25 imp gal | 0.1137 m³ |
| 50 imp gal | 0.2273 m³ |
| 100 imp gal | 0.4546 m³ |
Conversion chart
1 imp gal0.0045 m³
5 imp gal0.0227 m³
10 imp gal0.0455 m³
25 imp gal0.1137 m³
50 imp gal0.2273 m³
Worked example
1 imp gal = 0.00454609 m³. Apply the selected conversion formula to other input values.
Unit definition
Imperial gallons (imp gal) One imperial gallons equals 4.54609 litre.
Unit history
Imperial gallons is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert imp gal to litre.
3. Convert the base value to m³ and apply your display precision.
Understand the result before using it
Imperial gallons to Cubic metres converts a value measured in Imperial gallons (imp gal) into the equivalent value in Cubic metres (m³). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 4.54609 ÷ 1000
Assumptions
- Imperial gallons and Cubic metres represent the same volume quantity.
- The input is expressed in imp gal; the output is expressed in m³.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 imp gal = 0.00454609 m³. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a imp gal measurement in a document that expects m³.
- Compare a imperial gallons value with a value reported in cubic metres.
- Check the imp gal to m³ arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- US gallons and imperial gallons are different units; select the one your source actually uses.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Imperial gallons to Cubic metres?
result = input × 4.54609 ÷ 1000. Input is in imp gal; result is in m³. 1 imp gal = 0.00454609 m³. The displayed digits may be rounded.
What is 1 imp gal in m³?
1 imp gal = 0.00454609 m³. The displayed digits may be rounded.
Can I reverse the imp gal to m³ conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts m³ back to imp gal.
Is the Imperial gallons to Cubic metres result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.