---
title: "1 gal to mL = 3,785.4118 mL"
description: "1 US gallon is 3,785.4118 milliliters. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/1-gallons-to-ml/
site: "At One Place"
---

# 1 gal to mL

**1 US gallon in milliliters: 1 gal = 3,785.4118 mL**

mL = gal × 3,785.411784

1 US gallon is 3,785.4118 milliliters. To get there, multiply by 3,785.411784.

## Values either side

*US gallons near 1, converted to milliliters.*

| US gallons | Milliliters |
| --- | --- |
| 0.5 gal | 1,892.7059 |
| 1 gal ← | 3,785.4118 |
| 1.5 gal | 5,678.1177 |
| 2 gal | 7,570.8236 |
| 2.5 gal | 9,463.5295 |
| 3 gal | 11,356.235 |

## How the conversion works

The relationship is mL = gal × 3,785.411784. Both units measure volume, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

> US gallon: US liquid gallon. The imperial gallon is about 20% larger.

## Common questions

### What is 1 gal in milliliters?

1 gal is 3,785.4118 mL.

### How do you convert US gallons to milliliters?

Multiply by 3,785.411784.

## Related pages

- [US gallons to milliliters](https://atoneplace.net/convert/gallons-to-ml/)
- [1 mL to gal](https://atoneplace.net/convert/1-ml-to-gallons/)
- [0.5 gal to mL](https://atoneplace.net/convert/0-5-gallons-to-ml/)
- [1.5 gal to mL](https://atoneplace.net/convert/1-5-gallons-to-ml/)
- [2 gal to mL](https://atoneplace.net/convert/2-gallons-to-ml/)
- [2.5 gal to mL](https://atoneplace.net/convert/2-5-gallons-to-ml/)
- [3 gal to mL](https://atoneplace.net/convert/3-gallons-to-ml/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)