---
title: "US gallons to Cubic inches — gal to in³ converter"
description: "1 US gallon = 231 cubic inches. Convert US gallons to cubic inches with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/gallons-to-cubic-inches/
site: "At One Place"
---

# US gallons to cubic inches

**1 US gallon in cubic inches: 1 gal = 231 in³**

in³ = gal × 231

To convert US gallons to cubic inches, multiply by 231. The table below gives the values people look up most often, and the converter works for any number.

## US gallons to cubic inches table

*Common US gallon values converted to cubic inches.*

| US gallons | Cubic inches |
| --- | --- |
| 1 gal | 231 |
| 2 gal | 462 |
| 3 gal | 693 |
| 4 gal | 924 |
| 5 gal | 1,155 |
| 10 gal | 2,310 |
| 15 gal | 3,465 |
| 20 gal | 4,620 |
| 25 gal | 5,775 |
| 30 gal | 6,930 |
| 40 gal | 9,240 |
| 50 gal | 11,550 |
| 75 gal | 17,325 |
| 100 gal | 23,100 |
| 250 gal | 57,750 |
| 500 gal | 115,500 |
| 1,000 gal | 231,000 |

## How the conversion works

The relationship is in³ = gal × 231. 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

### How many cubic inches are in one US gallon?

One US gallon equals 231 cubic inches. in³ = gal × 231.

### How do you convert US gallons to cubic inches?

Use in³ = gal × 231. So 10 gal is 2,310 in³.

### How many US gallons are in one cubic inch?

One cubic inch equals 0.004329 US gallons, which is the reverse of the conversion above.

### Is there more than one kind of US gallon?

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

## Related pages

- [Cubic inches to US gallons](https://atoneplace.net/convert/cubic-inches-to-gallons/)
- [US gallons to Liters](https://atoneplace.net/convert/gallons-to-liters/)
- [US gallons to Milliliters](https://atoneplace.net/convert/gallons-to-ml/)
- [US gallons to Cubic meters](https://atoneplace.net/convert/gallons-to-cubic-meters/)
- [US gallons to US quarts](https://atoneplace.net/convert/gallons-to-quarts/)
- [US gallons to US pints](https://atoneplace.net/convert/gallons-to-pints/)
- [US gallons to US cups](https://atoneplace.net/convert/gallons-to-cups/)
- [US gallons to US fluid ounces](https://atoneplace.net/convert/gallons-to-fl-oz/)
- [US gallons to Tablespoons](https://atoneplace.net/convert/gallons-to-tablespoons/)
- [US gallons to Teaspoons](https://atoneplace.net/convert/gallons-to-teaspoons/)

## 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/)