Convert Imperial Gallon to US Cup
Convert imperial gallons to us cups instantly. 1 imperial gallon = 19.2151988081 us cup — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Cup to Imperial Gallon converter for the reverse conversion.
Units explained
Imperial Gallon
The imperial gallon is defined as exactly 4.54609 liters.
Set by the British Weights and Measures Act of 1824 as the volume of 10 lb of water.
Used for fuel and beverages in the UK and Commonwealth.
UK, 1824.
US Cup
A US customary cup is one sixteenth of a US gallon (236.588 mL).
Standardized for American cooking; distinct from the 240 mL US legal cup and the 250 mL metric cup.
The standard US cooking-volume unit in recipes.
US customary cooking measure.
Imperial Gallon to US Cup conversion formula
The relationship between imperial gallons and us cups:
To convert imperial gallons to us cups, multiply the value in imperial gallons by 19.2151988081. To reverse, multiply us cups by 0.0520421365.
How to use this converter
Type a value into the calculator. The result in us 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 US Cup to Imperial Gallon converter for the reverse direction.
Step-by-step: convert imperial gallons to us cups
- Write down the value in imperial gallons (gal).
- Multiply that value by the factor 19.2151988081.
- The product is the equivalent value in us cups (cup).
- To reverse, multiply the us cup value by 0.0520421365.
Worked examples
Example 1 — Convert 1 gal to cup:
1 × 19.2151988081 = 19.2151988081 cup
Example 2 — Convert 100 gal to cup:
100 × 19.2151988081 = 1921.5198808078 cup
Real-world example — Adjacent metric sub-units
One imperial gallon equals 1,000 us cups. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 gal × 19.2151988081 = 19.2151988081 cup
Real-world example — Adjacent small-scale precision
One imperial gallon equals 1,000 us 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 × 19.2151988081 = 19.2151988081 cup
Imperial Gallon to US Cup conversion table
Standard reference values for converting imperial gallons to us cups:
| Imperial Gallon [gal] | US Cup [cup] |
|---|---|
| 0.01 | 0.1921519881 |
| 0.1 | 1.9215198808 |
| 1 | 19.2151988081 |
| 2 | 38.4303976162 |
| 3 | 57.6455964242 |
| 4 | 76.8607952323 |
| 5 | 96.0759940404 |
| 10 | 192.1519880808 |
| 20 | 384.3039761616 |
| 30 | 576.4559642423 |
| 40 | 768.6079523231 |
| 50 | 960.7599404039 |
| 100 | 1921.5198808078 |
| 500 | 9607.5994040388 |
| 1000 | 19215.1988080777 |
Frequently asked questions
How many us cups is 1 imperial gallon?
How do I convert imperial gallons to us cups?
How do I convert us cups back to imperial gallons?
How many us cups is 100 imperial gallons?
Popular volume unit conversions
Convert Imperial Gallon to other volume units
Show all Imperial Gallon conversions
Metric / SI (15 units)
US Customary (Liquid) (15 units)
US Customary (Dry) (5 units)
Imperial (UK) (13 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 gal = 19.2151988081 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.