Convert US Gallon to Imperial Cup
Convert us gallons to imperial cups instantly. 1 us gallon = 13.3227869541 imperial cup — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Cup to US Gallon converter for the reverse conversion.
Units explained
US Gallon
The US liquid gallon is defined as exactly 231 cubic inches (3.785411784 liters).
Based on the English wine gallon of 231 cubic inches, retained by the US after 1824.
The primary US unit for fuel, milk and large beverage containers.
English wine gallon; US since 1824.
Imperial Cup
An imperial cup is half an imperial pint (284.131 mL).
A British cooking measure.
Used in older British and Commonwealth recipes.
UK cooking measure.
US Gallon to Imperial Cup conversion formula
The relationship between us gallons and imperial cups:
To convert us gallons to imperial cups, multiply the value in us gallons by 13.3227869541. To reverse, multiply imperial cups by 0.0750593703.
How to use this converter
Type a value into the calculator. The result in imperial cups 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 Cup to US Gallon converter for the reverse direction.
Step-by-step: convert us gallons to imperial cups
- Write down the value in us gallons (gal).
- Multiply that value by the factor 13.3227869541.
- The product is the equivalent value in imperial cups (cup).
- To reverse, multiply the imperial cup value by 0.0750593703.
Worked examples
Example 1 — Convert 1 gal to cup:
1 × 13.3227869541 = 13.3227869541 cup
Example 2 — Convert 100 gal to cup:
100 × 13.3227869541 = 1332.2786954064 cup
Real-world example — Adjacent small-scale precision
One us gallon equals 1,000 imperial cups — the standard sub-millimeter precision conversion that materials engineers use whenever they switch between bulk material thickness specs (larger unit) and surface-finish characteristics (smaller unit).
1 gal × 13.3227869541 = 13.3227869541 cup
Real-world example — Adjacent metric sub-units
One us gallon equals 1,000 imperial cups. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 gal × 13.3227869541 = 13.3227869541 cup
US Gallon to Imperial Cup conversion table
Standard reference values for converting us gallons to imperial cups:
| US Gallon [gal] | Imperial Cup [cup] |
|---|---|
| 0.01 | 0.1332278695 |
| 0.1 | 1.3322786954 |
| 1 | 13.3227869541 |
| 2 | 26.6455739081 |
| 3 | 39.9683608622 |
| 4 | 53.2911478163 |
| 5 | 66.6139347703 |
| 10 | 133.2278695406 |
| 20 | 266.4557390813 |
| 30 | 399.6836086219 |
| 40 | 532.9114781626 |
| 50 | 666.1393477032 |
| 100 | 1332.2786954064 |
| 500 | 6661.3934770319 |
| 1000 | 13322.7869540638 |
Frequently asked questions
How many imperial cups is 1 us gallon?
How do I convert us gallons to imperial cups?
How do I convert imperial cups back to us gallons?
How many imperial cups is 100 us gallons?
Popular volume unit conversions
Convert US Gallon to other volume units
Show all US Gallon conversions
Metric / SI (15 units)
US Customary (Liquid) (14 units)
US Customary (Dry) (5 units)
Imperial (UK) (14 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 gal = 13.3227869541 cup) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.