Convert Volume from Gallons to Cubic feet (gal to ft³)

Gallon to Cubic foot Conversion Formula

Example

Let's convert 5 Gallon (gal) to Cubic foot (ft³).

Using the formula:

Therefore, 5 Gallon (gal) is equal to 0.6684031222780849415 Cubic foot (ft³).

How many gallons are in one cubic foot? One Cubic foot (ft³) contains 7.480515625 Gallons (gal) — the inverse of the factor above. Multiplying by 0.1336806244556169883 takes you from gallons to cubic feet; multiplying by 7.480515625 brings you back.

Put in words: one gallon equals 0.1336806244556169883 cubic feet, so the gallon is the smaller unit of this pair. Converting between them never changes the amount of volume being measured — only the size of the unit you count it in.

What is a Gallon (gal)?

A gallon (gal) is a unit of volume, most commonly associated with the imperial and US customary systems of measurement.

It is equal to 128 Fluid Ounces (fl-oz).

What's the Difference Between a US Gallon and an Imperial Gallon?

A common point of confusion is the difference between the US gallon and the imperial gallon (used in the UK and other Commonwealth nations).

They are not the same size!

• The US Gallon is smaller, defined as 231 cubic inches, which is approximately 3.785 liters.
• The Imperial Gallon is larger, equivalent to about 4.546 liters.

This difference stems from historical definitions that were standardized differently in the US and Britain during the 18th and 19th centuries.

So, if you're comparing fuel efficiency, remember that "miles per gallon" ratings are based on different-sized gallons!

Where Does the Word "Gallon" Come From?

The word "gallon" has a rich history, tracing its roots back through several languages.

It originates from the Old Northern French word galon, which referred to a liquid measure.

This term is believed to have originated from the Gallo-Roman word gallēta, meaning a "pail" or "bucket." The ultimate origin likely goes back to a Celtic word, highlighting the unit's long-standing use in European trade and daily life for centuries.

What is a "Dry" Gallon?

While we typically associate the gallon with liquids, there is also a US dry gallon.

This unit, not commonly used today, is equivalent to one-eighth of a bushel, or about 4.405 liters. It was historically used to measure dry goods such as grain or fruit.

This is also why the famous "10-gallon hat" is a misnomer; its name doesn't refer to its volume.

Instead, it is thought to originate from the Spanish word galón, meaning "braid," which refers to the braided band on the hat.

What is a Cubic Foot (ft³)?

A cubic foot (ft³) is a standard unit of volume used in the United States imperial system.

It represents the space inside a cube that is one foot long on every side. The plural form is cubic feet.

How Big is a Cubic Foot?

It can be hard to picture a measurement, but a cubic foot is a widespread size.

Imagine a standard cardboard box measuring 1 foot wide, 1 foot long, and 1 foot high. This space can hold:

• Approximately 7.48 US gallons of water.
• About six standard-sized basketballs.

This real-world comparison helps you estimate the volume of everyday spaces, from the capacity of a fish tank to the amount of soil needed for a garden bed.

Common Uses of Cubic Feet

The cubic foot is used to measure volume in many household and commercial applications.

You will often see it used to describe:

• The capacity of appliances like refrigerators, freezers, and microwaves.
• The total storage space in a moving truck or storage unit.
• Natural gas consumption on your monthly utility bills.

Cubic Feet to Metric Conversions

In a world that often uses the metric system, it's helpful to know how to convert cubic feet.

• One cubic foot is equal to approximately 28.32 liters (L).
• One cubic foot is equal to about 0.0283 cubic meters (m³).

This is crucial for international trade, scientific work, or just understanding product specs from other countries.

For a quick estimate, remember that a cubic foot can hold more than 28 one-liter water bottles.

Gallon to Cubic foot Conversion Table

Here are some quick reference conversions from Gallon (gal) to Cubic foot (ft³):