Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
US cups to Imperial gallons Converter
1 cup ≈ 0.0520421365393 imp gal. Enter a value to convert cup to imp gal, then use the formula and table below. Displayed digits may be rounded.
VolumeInstant result
Decimals
Formula result = input × 0.2365882365 ÷ 4.54609. 1 cup ≈ 0.052 imp gal
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
Litres0.2366 L
Millilitres236.5882 mL
Cubic metres0.0002 m³
Cubic centimetres236.5882 cm³
US gallons0.0625 US gal
Imperial gallons0.052 imp gal
US quarts0.25 qt
US fluid ounces8 fl oz
Conversion table
| cup | imp gal |
|---|---|
| 1 cup | 0.052 imp gal |
| 2 cup | 0.1041 imp gal |
| 5 cup | 0.2602 imp gal |
| 10 cup | 0.5204 imp gal |
| 25 cup | 1.3011 imp gal |
| 50 cup | 2.6021 imp gal |
| 100 cup | 5.2042 imp gal |
Conversion chart
1 cup0.052 imp gal
5 cup0.2602 imp gal
10 cup0.5204 imp gal
25 cup1.3011 imp gal
50 cup2.6021 imp gal
Worked example
1 cup ≈ 0.0520421365393 imp gal. Apply the selected conversion formula to other input values.
Unit definition
US cups (cup) One us cups equals 0.2365882365 litre.
Unit history
US cups 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 cup to litre.
3. Convert the base value to imp gal and apply your display precision.
Understand the result before using it
US cups to Imperial gallons converts a value measured in US cups (cup) into the equivalent value in Imperial gallons (imp gal). 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 × 0.2365882365 ÷ 4.54609
Assumptions
- US cups and Imperial gallons represent the same volume quantity.
- The input is expressed in cup; the output is expressed in imp gal.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 cup ≈ 0.0520421365393 imp gal. 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 cup measurement in a document that expects imp gal.
- Compare a us cups value with a value reported in imperial gallons.
- Check the cup to imp gal 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 US cups to Imperial gallons?
result = input × 0.2365882365 ÷ 4.54609. Input is in cup; result is in imp gal. 1 cup ≈ 0.0520421365393 imp gal. The displayed digits may be rounded.
What is 1 cup in imp gal?
1 cup ≈ 0.0520421365393 imp gal. The displayed digits may be rounded.
Can I reverse the cup to imp gal conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts imp gal back to cup.
Is the US cups to Imperial gallons 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.