# Quarts to Gallons Converter

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

> Convert US quarts (US qt) to US gallons (US gal): 1 US quart = 0.25 US gal, so multiply by 0.25 or divide by 4. Both fields are editable, so you can also type in US gallons and get US quarts back.

## Inputs

- US quarts (US qt)

## Results

- US gallons

## Formula

```
1 US qt = 0.25 US gal
1 US gal = 4 US qt
US gal = US qt × 0.25
```

## Explanation

Divide quarts by 4 to get gallons. A car’s 5-quart oil capacity is 1.25 gallons.

### How to use the Quarts to Gallons Converter

- Type the number of US quarts into the **US quarts** field. Decimals such as 2 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 quarts 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 qt ⇄ 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 quart equals 0.25 US gallons. The calculator multiplies the number of US quarts you type by 0.25 to give US gallons, and when you type into the US gallons field it divides by the same factor to give US quarts. Because the ratio never changes, doubling the US quarts 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 quarts to US gallons

- Write down the value in US quarts, for example **4 US qt**.
- Multiply by the conversion factor 0.25 (because 1 US quart = 0.25 US gal).
- 4 × 0.25 = **1 US gal**.
- To go back from US gallons to US quarts, divide by 0.25 – or multiply by 4.

### US qt to US gal conversion table

US quartsUS gallonsUS gallonsUS quarts1 US qt0.25 US gal1 US gal4 US qt2 US qt0.5 US gal2 US gal8 US qt4 US qt1 US gal5 US gal20 US qt5 US qt1.25 US gal10 US gal40 US qt6 US qt1.5 US gal20 US gal80 US qt8 US qt2 US gal50 US gal200 US qt12 US qt3 US gal100 US gal400 US qt16 US qt4 US gal1,000 US gal4,000 US qt

### What is a US quart?

A U.S. quart is a quarter of a gallon, about 946 mL. Engine oil, ice cream and soups are often sold by the quart.

### 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.

### 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 quarts: 4 US qt.

Results — **US gallons = 1 US gal**.

## FAQ

**How many gallons is 5 quarts?**
1.25 gal.

**How many quarts in a gallon?**
4.

**How many US gallons are in one US quart?**
1 US qt = 0.25 US gal.

**How many US quarts are in one US gallon?**
1 US gal = 4 US qt.

**How do I convert US quarts to US gallons?**
Multiply the number of US quarts by 0.25. For example, 4 US qt × 0.25 = 1 US gal.

**How do I convert US gallons back to US quarts?**
Divide by 0.25 (or multiply by 4), or simply type the value into the US gallons field above.

**What is 5 US qt in US gallons?**
5 US qt = 1.25 US gal.

**What is 2 US qt in US gallons?**
2 US qt = 0.5 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 quarts and US gallons. To pick any volume unit, use the general volume converter linked under Related calculators.

**What formula does the Quarts to Gallons Converter use?**
1 US qt = 0.25 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)