Volume · Unit Converter

Convert US Cup to Imperial Gallon

Convert us cups to imperial gallons instantly. 1 us cup = 0.0520421365 imperial gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Gallon to US Cup converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Dr. Jaya Christiyan K G, Ph.D.
Volume category 2 min read Published Last reviewed Updated

Units explained

US Customary (Liquid)

US Cup

What is a us cup?

A US customary cup is one sixteenth of a US gallon (236.588 mL).

Origin of the us cup

Standardized for American cooking; distinct from the 240 mL US legal cup and the 250 mL metric cup.

Where it is used

The standard US cooking-volume unit in recipes.

When and where it was developed

US customary cooking measure.

Imperial (UK)

Imperial Gallon

What is a imperial gallon?

The imperial gallon is defined as exactly 4.54609 liters.

Origin of the imperial gallon

Set by the British Weights and Measures Act of 1824 as the volume of 10 lb of water.

Where it is used

Used for fuel and beverages in the UK and Commonwealth.

When and where it was developed

UK, 1824.

US Cup to Imperial Gallon conversion formula

The relationship between us cups and imperial gallons:

1 cup = 0.0520421365 gal
1 gal = 19.2151988081 cup

To convert us cups to imperial gallons, multiply the value in us cups by 0.0520421365. To reverse, multiply imperial gallons by 19.2151988081.

How to use this converter

Type a value into the calculator. The result in imperial gallons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Imperial Gallon to US Cup converter for the reverse direction.

Step-by-step: convert us cups to imperial gallons

  1. Write down the value in us cups (cup).
  2. Multiply that value by the factor 0.0520421365.
  3. The product is the equivalent value in imperial gallons (gal).
  4. To reverse, multiply the imperial gallon value by 19.2151988081.

Worked examples

Example 1 — Convert 1 cup to gal:
1 × 0.0520421365 = 0.0520421365 gal

Example 2 — Convert 100 cup to gal:
100 × 0.0520421365 = 5.2042136539 gal

Real-world example — Packaging gauge

A 4-us cup plastic bag thickness is a common spec for grocery and freezer bags. Converting from us cups to imperial gallons is what packaging buyers do whenever they bridge US and metric supplier quotes.

4 cup × 0.0520421365 = 0.2081685462 gal

Real-world example — Plastic film and laminate thickness

A 500-us cup sheet is a typical spec for ID-card laminates and film overlays. Converting to imperial gallons aligns the value with the unit most CAD systems and material datasheets prefer.

500 cup × 0.0520421365 = 26.0210682697 gal

US Cup to Imperial Gallon conversion table

Standard reference values for converting us cups to imperial gallons:

US Cup [cup]Imperial Gallon [gal]
0.010.0005204214
0.10.0052042137
10.0520421365
20.1040842731
30.1561264096
40.2081685462
50.2602106827
100.5204213654
201.0408427308
301.5612640962
402.0816854616
502.602106827
1005.2042136539
50026.0210682697
100052.0421365393

Frequently asked questions

How many imperial gallons is 1 us cup?
1 us cup equals 0.0520421365 imperial gallon.
How do I convert us cups to imperial gallons?
Multiply the value in us cups by 0.0520421365 to get imperial gallons.
How do I convert imperial gallons back to us cups?
Multiply the value in imperial gallons by 19.2151988081, or use the Imperial Gallon to US Cup converter.
How many imperial gallons is 100 us cups?
100 us cups equals 5.2042136539 imperial gallons, because 100 × 0.0520421365 = 5.2042136539.

Convert US Cup to other volume units

Show all US Cup conversions
Metric / SI (8 units)
US Cup to Cubic Centimeter (cm³) US Cup to Milliliter (mL) US Cup to Centiliter (cL) US Cup to Deciliter (dL) US Cup to Cubic Decimeter (dm³) US Cup to Liter (L) US Cup to Hectoliter (hL) US Cup to Cubic Meter (m³)
US Customary (Liquid) (7 units)
US Cup to US Teaspoon (tsp) US Cup to US Tablespoon (tbsp) US Cup to US Fluid Ounce (fl oz) US Cup to US Pint (pt) US Cup to US Quart (qt) US Cup to US Gallon (gal) US Cup to US Oil Barrel (bbl (oil))
Imperial (UK) (4 units)
US Cup to Imperial Fluid Ounce (fl oz) US Cup to Imperial Pint (pt) US Cup to Imperial Quart (qt) US Cup to Imperial Gallon (gal)
Cubic (length-derived) (3 units)
US Cup to Cubic Inch (in³) US Cup to Cubic Foot (ft³) US Cup to Cubic Yard (yd³)
Cooking / Culinary (3 units)
US Cup to Metric Teaspoon (tsp) US Cup to Metric Tablespoon (tbsp) US Cup to Metric Cup (cup)

Sources & references

Conversion factor (1 cup = 0.0520421365 gal) verified against the following authoritative sources:

Results are provided for general reference. Verify critical measurements against an authoritative standard.