US gallons to US cups
Multiply US gallons by 16 to get US cups.
3 gal = 48 cup
How to convert US gallons to US cups
The US cup is a US customary cup, one sixteenth of a gallon (236.5882365 millilitres). The US gallon is the US liquid gallon, exactly 231 cubic inches (3.785411784 litres).
Worked example — 3 gal: 3 × 16 = 48 cup.
US gallons to US cups table
| US gallons | US cups |
|---|---|
| 0.25 gal | 4 cup |
| 0.5 gal | 8 cup |
| 1 gal | 16 cup |
| 2 gal | 32 cup |
| 3 gal | 48 cup |
| 4 gal | 64 cup |
| 5 gal | 80 cup |
| 10 gal | 160 cup |
| 20 gal | 320 cup |
Reverse and related
About US gallons and US cups
US gallon (gal)
1 gal = 16 cupDefinition. The US liquid gallon, exactly 231 cubic inches (3.785411784 litres)
History and origin
The US gallon derives from the old English wine gallon of 231 cubic inches, a value the United States kept when Britain moved to a larger imperial gallon in 1824. It equals exactly 3.785411784 litres.
Current use
The gallon is the everyday US unit for fuel, milk and paint; the imperial gallon used in the UK and Canada is about 20 percent larger.
Source: NIST Handbook 44, Appendix C §2 (U.S. Customary Units) and §5 (Tables of Equivalents)
US cup (cup)
1 cup = 0.0625 galDefinition. A US customary cup, one sixteenth of a gallon (236.5882365 millilitres)
History and origin
The US customary cup was standardised as a cooking measure at one sixteenth of a gallon, about 237 millilitres. It became popular through American recipe books in the nineteenth and twentieth centuries.
Current use
The cup is the dominant volume measure in US home cooking and baking; metric recipes usually give millilitres or grams instead.
Source: NIST Handbook 44, Appendix C §2 (U.S. Customary Units) and §5 (Tables of Equivalents)
Where people use this
US gallons: fuel in the US, large containers, paint. US cups: recipes, baking. 1 US gallon is exactly 16 cups.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST Handbook 44, Appendix C §2 (U.S. Customary Units) and §5 (Tables of Equivalents).
Questions people ask
How many cups in a gallon?
One US gallon is exactly 16 US cups.
How many cups is half a gallon?
Half a US gallon is 8 cups.
How many cups is 2 gallons?
2 US gallons is 32 cups.