# Cups to Gallons Converter

URL: https://speedycalculator.com/calculators/conversion/cups-to-gallons/
Last updated: 2026-10-25

> Convert US cups (US cup) to US gallons (US gal): 1 US cup = 0.0625 US gal, so multiply by 0.0625 or divide by 16. Both fields are editable, so you can also type in US gallons and get US cups back.

## Inputs

- US cups (US cup)

## Results

- US gallons

## Formula

```
1 US cup = 0.0625 US gal
1 US gal = 16 US cup
US gal = US cup × 0.0625
```

## Explanation

Sixteen U.S. cups make a gallon. Use it to scale recipes for drinks, soups and party batches.

### How to use the Cups to Gallons Converter

- Type the number of US cups into the **US cups** field. Decimals such as 8 are fine.
- Read the answer in **US gallons** – it updates as you type, with no button to press.
- To convert the other way, type into **US gallons** and the US cups 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 cup ⇄ US gal. 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 cup equals 0.0625 US gallons. The calculator multiplies the number of US cups you type by 0.0625 to give US gallons, and when you type into the US gallons field it divides by the same factor to give US cups. Because the ratio never changes, doubling the US cups always doubles the US gallons. 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 cups to US gallons

- Write down the value in US cups, for example **16 US cup**.
- Multiply by the conversion factor 0.0625 (because 1 US cup = 0.0625 US gal).
- 16 × 0.0625 = **1 US gal**.
- To go back from US gallons to US cups, divide by 0.0625 – or multiply by 16.

### US cup to US gal conversion table

US cupsUS gallonsUS gallonsUS cups1 US cup0.0625 US gal1 US gal16 US cup2 US cup0.125 US gal2 US gal32 US cup4 US cup0.25 US gal5 US gal80 US cup8 US cup0.5 US gal10 US gal160 US cup12 US cup0.75 US gal20 US gal320 US cup16 US cup1 US gal50 US gal800 US cup24 US cup1.5 US gal100 US gal1,600 US cup32 US cup2 US gal1,000 US gal16,000 US cup48 US cup3 US gal64 US cup4 US gal

### 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.

### 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.

### Quick mental conversion

For a fast estimate, multiply US cups by about **0.062** to get US gallons; the error is about 0.8%. Use the calculator above when you need the exact figure.

### 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.

## Worked example

Inputs — US cups: 16 US cup.

Results — **US gallons = 1 US gal**.

## FAQ

**How many cups in a gallon?**
16.

**How many cups in half a gallon?**
8.

**How many US gallons are in one US cup?**
1 US cup = 0.0625 US gal.

**How many US cups are in one US gallon?**
1 US gal = 16 US cup.

**How do I convert US cups to US gallons?**
Multiply the number of US cups by 0.0625. For example, 16 US cup × 0.0625 = 1 US gal.

**How do I convert US gallons back to US cups?**
Divide by 0.0625 (or multiply by 16), or simply type the value into the US gallons field above.

**What is 2 US cup in US gallons?**
2 US cup = 0.125 US gal.

**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 cups and US gallons. To pick any volume unit, use the general volume converter linked under Related calculators.

**What formula does the Cups to Gallons Converter use?**
1 US cup = 0.0625 US gal.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)