US liquid volume converter
Cups to Gallons Converter
Convert US customary cups and US liquid gallons in either direction without mixing in dry or imperial gallons.
How to convert cups to gallons
One US liquid gallon contains exactly 16 US customary cups. Divide cups by 16 for gallons, or multiply gallons by 16 for cups.
US liquid gallons = US cups ÷ 16
US cups = US liquid gallons × 16
16 US customary cups = 1 US liquid gallon exactly
Example: 12 cups ÷ 16 = 0.75 gallon. In the other direction, 1.5 gallons × 16 = 24 cups.
When cup-to-gallon conversion helps
Cups are convenient for smaller portions, while gallons are more useful for containers and larger batches.
Recipe scaling
Turn a large recipe total from cups into gallons before choosing a pitcher, stockpot, or storage container.
Drinks and water
Compare cups consumed or prepared with a gallon-sized jug while keeping the result in US liquid measure.
Container planning
Check whether 4, 8, 12, 16, or more cups fit a quarter-, half-, three-quarter-, or full-gallon container.
US cups to gallons chart
These exact cup fractions are displayed to four decimal places; every row uses 16 US cups per US liquid gallon.
| US Cups (cup) | US Liquid Gallons (gal) |
|---|---|
| 1 | 0.0625 |
| 2 | 0.1250 |
| 4 | 0.2500 |
| 6 | 0.3750 |
| 8 | 0.5000 |
| 10 | 0.6250 |
| 12 | 0.7500 |
| 14 | 0.8750 |
| 16 | 1.0000 |
| 20 | 1.2500 |
| 24 | 1.5000 |
| 32 | 2.0000 |
| 48 | 3.0000 |
| 64 | 4.0000 |
US liquid, imperial, and dry gallons are different
This converter pairs US customary cups with US liquid gallons. The factor of 16 is exact, so values such as 4 cups = 0.25 gallon and 8 cups = 0.5 gallon do not depend on rounding.
An imperial gallon is larger than a US liquid gallon. One imperial gallon is about 19.2152 US customary cups, so do not use the 16-cup relationship when a UK or imperial gallon is specified.
A US dry gallon is also a different volume and is not used here. For recipes, containers, and labels, match the measurement system named by the source before converting.
Sources and method
The unit constants come from the primary standards below. ToolNeko applies those constants in a browser-only calculation, then rounds only the displayed result.
- NIST — Metric Kitchen: Cooking Measurement Equivalencies Lists one gallon as four quarts, 128 fluid ounces, or 16 cups.
- NIST Guide to the SI, Appendix B.9 Provides separate conversion factors for the US cup, US gallon, and Canadian or UK gallon.
Frequently asked questions
How do I convert cups to gallons?
Divide the number of US cups by 16. For example, 20 cups ÷ 16 = 1.25 US liquid gallons.
Does 4 cups equal 1 gallon?
No. Four US cups equal 0.25 US liquid gallon, which is one US liquid quart.
How many gallons is 8 cups?
Eight US cups equal exactly 0.5 US liquid gallon.
Does 16 cups equal 1 gallon?
Yes. Sixteen US customary cups equal exactly one US liquid gallon.
Is an imperial gallon also 16 US cups?
No. One imperial gallon is about 19.2152 US customary cups. This page converts US cups and US liquid gallons only.
How do I convert gallons back to cups?
Multiply US liquid gallons by 16, or paste a value such as 1.5 gallons into either field and the converter will switch direction.