A U.S. gallon holds 16 cups. Handy for batch cooking, homemade lemonade or working out how many servings a gallon makes.
How to use the Gallons to Cups Converter
- Type the number of US gallons into the US gallons field. Decimals such as 0.5 are fine.
- Read the answer in US cups – it updates as you type, with no button to press.
- To convert the other way, type into US cups and the US gallons are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only US gal ⇄ US cup. Need a different unit? Use the general volume converter, where you can choose any “from” and “to” unit.
How it works
Both units measure volume, so they are always in the same ratio: one US gallon equals 16 US cups. The calculator multiplies the number of US gallons you type by 16 to give US cups, and when you type into the US cups field it divides by the same factor to give US gallons. Because the ratio never changes, doubling the US gallons always doubles the US cups. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert US gallons to US cups
- Write down the value in US gallons, for example 1 US gal.
- Multiply by the conversion factor 16 (because 1 US gallon = 16 US cup).
- 1 × 16 = 16 US cup.
- To go back from US cups to US gallons, divide by 16 – or multiply by 0.0625.
US gal to US cup conversion table
| US gallons | US cups | US cups | US gallons |
|---|---|---|---|
| 0.25 US gal | 4 US cup | 1 US cup | 0.0625 US gal |
| 0.5 US gal | 8 US cup | 2 US cup | 0.125 US gal |
| 1 US gal | 16 US cup | 5 US cup | 0.3125 US gal |
| 2 US gal | 32 US cup | 10 US cup | 0.625 US gal |
| 3 US gal | 48 US cup | 20 US cup | 1.25 US gal |
| 5 US gal | 80 US cup | 50 US cup | 3.125 US gal |
| 10 US gal | 160 US cup | 100 US cup | 6.25 US gal |
| 1,000 US cup | 62.5 US gal |
What is a US gallon?
The U.S. liquid gallon is exactly 231 cubic inches, about 3.785 litres. It is used for fuel, milk, water and paint in the United States.
What is a US cup?
The U.S. customary cup is 8 U.S. fluid ounces, about 236.6 mL. Recipes from Australia, Canada and New Zealand often use the 250 mL metric cup instead.
Common mistakes to avoid
Mixing u.s. and uk gallons, pints and fluid ounces, assuming a cup is always 250 ml, and treating volume and weight as interchangeable for anything except water.
Formula
1 US gal = 16 US cup1 US cup = 0.0625 US galUS cup = US gal × 16Worked example
Inputs — US gallons: 1 US gal.
Results — US cups = 16 US cup.
Frequently asked questions
How many cups in a gallon?
16.
How many 8 oz servings in a gallon?
16.
How many US cups are in one US gallon?
1 US gal = 16 US cup.
How many US gallons are in one US cup?
1 US cup = 0.0625 US gal.
How do I convert US gallons to US cups?
Multiply the number of US gallons by 16. For example, 1 US gal × 16 = 16 US cup.
How do I convert US cups back to US gallons?
Divide by 16 (or multiply by 0.0625), or simply type the value into the US cups field above.
What is 10 US gal in US cups?
10 US gal = 160 US cup.
What is 5 US gal in US cups?
5 US gal = 80 US cup.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between US gallons and US cups. To pick any volume unit, use the general volume converter linked under Related calculators.
What formula does the Gallons to Cups Converter use?
1 US gal = 16 US cup.