# Liters to Gallons Converter

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

> Convert litres (L) to US gallons (US gal): 1 litre = 0.26417205 US gal, so multiply by 0.26417205 or divide by 3.7854118. Both fields are editable, so you can also type in US gallons and get litres back.

## Inputs

- Litres (L)

## Results

- US gallons

## Formula

```
1 L = 0.26417205 US gal
1 US gal = 3.7854118 L
US gal = L × 0.26417205
```

## Explanation

Fuel tanks, water bottles and aquariums are sized in litres or gallons. One U.S. gallon is exactly 3.785411784 L and one UK gallon 4.54609 L.

### How to use the Liters to Gallons Converter

- Type the number of litres into the **Litres** field. Decimals such as 10 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 litres 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 L ⇄ 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 litre equals 0.26417205 US gallons. The calculator multiplies the number of litres you type by 0.26417205 to give US gallons, and when you type into the US gallons field it divides by the same factor to give litres. Because the ratio never changes, doubling the litres 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 litres to US gallons

- Write down the value in litres, for example **20 L**.
- Multiply by the conversion factor 0.26417205 (because 1 litre = 0.26417205 US gal).
- 20 × 0.26417205 = **5.283441 US gal**.
- To go back from US gallons to litres, divide by 0.26417205 – or multiply by 3.7854118.

### L to US gal conversion table

LitresUS gallonsUS gallonsLitres1 L0.26417205 US gal1 US gal3.7854118 L2 L0.5283441 US gal2 US gal7.5708236 L5 L1.3208603 US gal5 US gal18.927059 L10 L2.6417205 US gal10 US gal37.854118 L15 L3.9625808 US gal20 US gal75.708236 L20 L5.283441 US gal50 US gal189.27059 L40 L10.566882 US gal100 US gal378.54118 L50 L13.208603 US gal1,000 US gal3,785.4118 L60 L15.850323 US gal75 L19.812904 US gal200 L52.83441 US gal1,000 L264.17205 US gal

### What is a litre?

A litre is one cubic decimetre, 1,000 cm³. Bottles, fuel, engine sizes and many recipes use litres; a litre of water weighs about 1 kg.

### 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 litres by about **0.26** to get US gallons; the error is about 1.6%. 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 — Litres: 20 L.

Results — **US gallons = 5.28344105 US gal**.

## FAQ

**How many gallons is 20 litres?**
About 5.28 US gal or 4.40 UK gal.

**Which gallon is used for fuel prices?**
U.S. gallons in the U.S.; the UK now prices fuel per litre.

**How many US gallons are in one litre?**
1 L = 0.26417205 US gal.

**How many litres are in one US gallon?**
1 US gal = 3.7854118 L.

**How do I convert litres to US gallons?**
Multiply the number of litres by 0.26417205. For example, 20 L × 0.26417205 = 5.283441 US gal.

**How do I convert US gallons back to litres?**
Divide by 0.26417205 (or multiply by 3.7854118), or simply type the value into the US gallons field above.

**What is 10 L in US gallons?**
10 L = 2.6417205 US gal.

**What is 100 L in US gallons?**
100 L = 26.417205 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 litres and US gallons. To pick any volume unit, use the general volume converter linked under Related calculators.

**What formula does the Liters to Gallons Converter use?**
1 L = 0.26417205 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)