Gallon To Cubic Foot Converter

Verified by the ConvertReference Technical Standards Team

ConvertReference Technical Standards Team

All values and formulas are validated through our editorial review process and cross-checked against internationally recognized reference standards (NIST, BIPM, CODATA).

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Last reviewed: December 07, 2025

Conversion Factors

1 gallon = 0.133680555555556 cubic foot
1 cubic foot = 7.48051948051948 gallon

(Exact factors: 0.133680555555556 and 7.48051948051948)

Sources: NIST · BIPM

About This Gallon And Cubic Foot Converter

This quick tool helps you compare gallons and cubic feet. Use the swap button to switch between units. See the cubic feet result update when you change the gallons value. It's fast, simple, and designed for easy reference.

What Are Gallons And Cubic Feet?

What Is A Gallon?

Definition: A gallon is a unit of volume used in the US customary and Imperial systems. In the US, 1 US gallon = 231 cubic inches = 3.78541 liters. In the Imperial system, 1 imperial gallon = 4.54609 liters. Symbol: gal. Example: a standard milk jug holds about 1 gallon (3.785 L).

What Is A Cubic Foot?

Cubic foot (ft^3) is a unit of volume in the Imperial/US customary system. It equals the volume of a cube 1 foot on each side. Exact relation to SI: 1 ft = 0.3048 m, so 1 ft^3 = (0.3048 m)^3 = 0.028316846592 m^3 (~28.316 L). Common symbol: ft^3. Real-world example: a cube 1 ft × 1 ft × 1 ft (12 in sides) holds about 28 liters.

When To Use Gallon Vs Cubic Foot

Gallon Usage

Gallon is a customary unit used mainly in the United States for liquids such as fuel, beverages, and household products. It is also encountered in Canada, Liberia, and Myanmar in certain markets or older practices, alongside liters.

Cubic Foot Usage

The cubic foot is used primarily in the United States and Canada for measuring volumes in homes, businesses, and utilities.

How To Convert Between Gallons And Cubic Feet

Conversion Formulas

Gallon to Cubic Foot:
gallon × 0.133680555555556 = cubic foot

Cubic Foot to Gallon:
cubic foot × 7.48051948051948 = gallon

Step-by-Step Guide

Gallon to Cubic Foot

Take your value in gallons.
Multiply by 0.133680555555556.
The result is in cubic feet.

Cubic Foot to Gallon

Take your value in cubic feet.
Multiply by 7.48051948051948.
The result is in gallons.

Example: Convert 0.05 gallons to cubic feet.

Exact: 0.05 × 0.133680555555556 = 0.00668402777777778 cubic feet.
Rounded: approximately 0.00668403 cubic feet.

Example: Convert 5 cubic feet to gallons.

Exact: 5 × 7.48051948051948 = 37.4025974025974 gallons.
Rounded: approximately 37.4026 gallons.

History & Context

Gallon and cubic foot are old units born from ordinary work in markets and farms. The gallon grew from measures used for wine and ale in medieval England, where different towns kept different sizes and merchants relied on vessels to sell by volume. Over centuries rulers and legislatures tried to standardize these units, and later English and American systems adopted forms tied to those early measures. The cubic foot comes from the idea of space measured as the cube of a human foot, a natural extension of length practice used in building, land, and shipping. Both units traveled with trade and craft, leaving a memory of old trades in today's words and laws.

Practical Use

When you're planning a water tank for irrigation, the tank's capacity might be listed in gallons, and you need to know its size in cubic feet to fit the space. That requires converting gallon to cubic foot to compare volume to the available footprint. For shipping or storage in a warehouse, bulk liquids are often measured in cubic feet, so you would convert cubic foot to gallon to match inventory or pricing in gallons.

Common Mistakes When Converting Between Gallons And Cubic Feet

Using the wrong gallon type for the conversion, such as mistaking US gallons for imperial gallons.
Treating gallons as if they were liters and comparing directly to cubic feet.
Assuming the same conversion applies in both directions without checking which unit is being converted.
Ignoring the need to confirm the exact units before performing the conversion.

Mental Shortcuts For Quick Conversions

Tip 1 (gal → ft^3): 1 ft^3 ≈ 7.5 gal; estimate by dividing gallons by 7.5. Tip 2 (ft^3 → gal): 1 ft^3 ≈ 7.5 gal; estimate by multiplying cubic feet by 7.5. For estimation only; use a precise converter for accurate results in most situations.

Gallons And Cubic Feet Conversion Graph

Conversion Table For Gallon And Cubic Foot

Common conversion values
Gallons	Cubic feet
0.01	0.00133681
0.05	0.00668403
0.1	0.0133681
0.2	0.0267361
0.5	0.0668403
1	0.133681
2	0.267361
5	0.668403
10	1.33681
20	2.67361

Values are rounded for display; internal calculations use the exact conversion factors between gallon and cubic foot (0.133680555555556 and 7.48051948051948).

Dataset & API Access

Programmatic Access

Free JSON API with stable endpoints and predictable keys for automated bidirectional conversions.

Endpoint: https://convertreference.org/api/v1/convert/gallon-to-cubic-foot.json

Content Type: application/json

Documentation: View API docs

Licensing

License: CC0 1.0 Universal (Public Domain)

See all datasets

Data & Editorial Process

All numerical values and formulas are generated from the Pint scientific unit library (v0.25), using constants consistent with the BIPM SI Brochure (9th Edition) and NIST Special Publication 811. Explanatory text is drafted with AI assistance and reviewed by ConvertReference editors for clarity and accuracy. This converter is completely free to use, and all calculations are performed locally in your browser and never sent to a server.

2025-12-07 – Generated: Page created using Pint v0.25 verified constants.
2025-12-07 – Reviewed: Verified by ConvertReference editors; no numerical changes required.

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