The quick answer / US liquid measurements
How Many Cups in a Gallon?
There are 16 cups in 1 gallon (US liquid). That's 1 gal = 16 c = 8 pt = 4 qt = 128 fl oz ≈ 3.79 L.
Let’s measure that.
US liquid measurements. You can use decimals or fractions, including ½ and 1 1/2.
A quick reference.
| gallons | cups |
|---|---|
| ⅛ gallon | 2 cups |
| ¼ gallon | 4 cups |
| ½ gallon | 8 cups |
| ¾ gallon | 12 cups |
| 1 gallon | 16 cups |
| 2 gallons | 32 cups |
A note on measurements.
This calculator uses US liquid measures. Imperial measures and US dry measures are different. Fluid ounces describe volume; they don’t tell you how much flour, sugar, or another ingredient weighs.
For baking by weight, use the grams given in the recipe. If you’re converting a recipe from another country, check which size cup it uses.
Source: NIST household measurement referenceA few common questions.
What is a gallon?
A US liquid gallon is 128 fluid ounces, equal to 4 quarts, 8 pints, or 16 cups (≈ 3.79 L).
Does this apply to UK/Imperial measurements?
No, this calculator uses US liquid measurements. Imperial and dry quarts differ.