Cubic feet to gallons | Calculator (2024)

Using the Cubic Feet and Gallon Converter

This converter allows you to convert between commonly used units of volume in the imperial system.

The converter offers a choice of three different units: a cubic foot, an imperial Gallon (used in the UK), and a Gallon (used in the US, hence referred to as the US Gallon throughout this article).

Simply choose your input unit from the menu below the ‘Convert From’ sign.

Then choose your output value from the menu below the ‘Convert To’ sign.

Alternatively, you may just swap the preselected options by clicking on the icon with the two arrows going in opposite directions. Once you are happy with your input and output selection, type in the value you want to convert as a decimal number, choose the number of decimal places you want your result to be rounded to, and click on ‘Convert’. You will receive the result rounded to the desired number of decimal places, in the output unit of your choice, alongside a rate, which determines the conversion, as we will show later on in the text.

Converting Gallons and Cubic Feet Manually

The relationships between the three units determine the rates and formulas used for their conversions.

The following table will show all of the relationships from which we determine everything that follows.

Each row shows two values that are equivalent. The values are rounded to two decimal places. For more accurate calculations, use our converter.

1 cubic foot7.48 US Gallons
1 cubic foot6.23 imperial Gallons
1 imperial Gallon0.16 cubic feet
1 imperial Gallon1.2 US Gallons
1 US Gallon0.13 cubic feet
1 US Gallon0.83 imperial Gallons

Moving forward, we will now explain how each unit is converted to the other two, including formulae and examples.

Converting Cubic Feet Manually

The first unit we will have a closer look at is the cubic foot.

From the table we created, 4 important relationships need to be considered:

  • 1 cubic foot is equal to 7.48 US Gallons
  • 1 cubic foot is equal to 6.23 imperial Gallons
  • 1 imperial Gallon is equal to 0.16 cubic feet
  • 1 US Gallon is equal to 0.13 cubic feet

These rates lead to the following formulae:

US GALLONS = $FEET^3$ x 7.48

$FEET^3$ = US GALLONS x 0.13



The recommended way to use each formula is to select the one where the output is the subject of the formula (in our case, the left side of the equation). The four examples below will demonstrate how these formulae are used in practice for manual conversions.

EXAMPLE 1: Convert 2.5 $ft^3$ into US Gallons.

After choosing the first formula, we perform the following calculations.

US GALLONS = $FEET^3$ x 7.48 = 2.5 x 7.48 = 18.7 US Gallons.

EXAMPLE 2: Convert 33 US Gallons into $ft^3$.

The second formula will come in handy for this calculation.

$FEET^3$ = US GALLONS x 0.13 = 33 x 0.13 = 4.29 $ft^3$.

EXAMPLE 3: Convert 17 $ft^3$ into Imperial Gallons.

We will apply the third formula.

IMPERIAL GALLONS = $FEET^3$ x 6.23 = 17 x 6.23 = 105.91 Imperial Gallons

EXAMPLE 4: Convert 2 Imperial Gallons into $ft^3$.

We substitute 2 Imperial Gallons into the fourth formula and calculate as follows.

$FEET^3$ = IMPERIAL GALLONS x 0.16 = 2 x 0.16 = 0.32 Imperial Gallons.

Converting between Gallons Manually

The additional task we might want to tackle manually is converting between the two types of Gallons.

The rates between them are defined by the following two relationships:

  • 1 US Gallon is equivalent to 0.83 Imperial Gallons.
  • 1 Imperial Gallon is equivalent to 1.2 US Gallons.

This helps us derive two formulae:



The following examples will shed some light on their real-life application.

EXAMPLE 1: Convert 3 Imperial Gallons into US Gallons.

Using the first formula, the following calculations take place:

US GALLONS = IMPERIAL GALLONS x 0.83 = 3 x 0.83 = 2.49 US Gallons.

EXAMPLE 2: Convert 10 US Gallons into Imperial Gallons.

The second formula will come in handy, leading to the following calculations:

IMPERIAL GALLONS = US GALLONS x 1.2 = 10 x 1.2 = 12 Imperial Gallons.

A cubic foot, as the name suggests, is the volume of a cube with a side length of exactly 1 foot.

The volume of such a cube in metric units is equivalent to 28.31 liters.

To gain some perspective on the cubic foot, here are a few items you might find around your house, and their volumes in cubic feet:

  • Larger microwave ovens have a volume of around 1 cubic foot.
  • Most fridges and freezers have around 25 cubic feet in volume.
  • A cubic foot of concrete can lay out the foundation for a small garden.
  • Most air conditioning units are around a cubic foot in volume.

Why are there Two Gallons?

There are both Imperial Gallons and US Gallons due to historical reasons related to the units of measurement used in the British Empire and the United States.

The Imperial Gallon, also known as the British Gallon, was first introduced in England in the 16th century and was used as the standard unit of measurement for liquids in the British Empire, including the colonies that later became the United States.

However, after the American Revolution, the US decided to develop its own system of units, including the US Gallon. The US Gallon is defined as exactly 231 cubic inches, which is about 3.785 liters, and is used primarily in the United States for measuring liquids.

In 1824, the British adopted the Imperial measure in which the Gallon is based on 10 pounds or 277.42 cubic inches of water.

The historical background also refers to what the Gallon originally measured. The concept of the Gallon as a unit of measurement for liquids originated in England, specifically for wine and beer. The two systems used different sizes of Gallons, with the first based on the wine Gallon, which was equal in size to the US Gallon. The second system was based on either the ale Gallon or the larger Imperial Gallon.

Thus, both the Imperial Gallon and the US Gallon exist today due to the historical differences in measurement systems used in the British Empire and the United States.


Expertise in Volume Conversion and Measurement

I am well-versed in the concepts and practical applications of volume conversion and measurement, particularly in the context of the imperial system. My expertise is demonstrated through a deep understanding of the relationships between cubic feet, US Gallons, and imperial Gallons, as well as the manual conversion processes involved. This knowledge is supported by the ability to apply the conversion formulas in real-life scenarios, as evidenced by the detailed examples provided in the article.

Concepts Related to Volume Conversion

Cubic Feet, US Gallons, and Imperial Gallons

The article discusses the conversion between commonly used units of volume in the imperial system, specifically focusing on cubic feet, US Gallons (used in the US), and imperial Gallons (used in the UK).

Conversion Process

The article outlines the process of using a converter to switch between different units of volume, providing step-by-step instructions for selecting input and output units, entering values, and obtaining the converted result.

Manual Conversion Formulas

It explains the manual conversion formulas for converting cubic feet to US Gallons, imperial Gallons, and vice versa. The relationships and formulae for each unit are clearly presented, along with practical examples demonstrating their application.

Historical Background of Gallons

The article delves into the historical reasons behind the existence of both Imperial Gallons and US Gallons, tracing their origins to the measurement systems used in the British Empire and the United States. It provides insights into the differences in measurement systems and the historical context that led to the development of distinct gallon measurements in the two regions.

Practical Applications and Examples

The practical applications of volume measurements are highlighted through examples related to everyday items and their volumes in cubic feet. This includes items such as microwave ovens, fridges, freezers, concrete, and air conditioning units, providing a tangible understanding of cubic feet in real-world contexts.

By drawing on the information provided in the article and my expertise in volume conversion and measurement, I can confidently address any questions or discussions related to these concepts.

Cubic feet to gallons | Calculator (2024)


What is the formula for cubic feet to gallons? ›

There are 7.48 gallons of water in one cubic foot of water. To convert gallons to cubic feet, divide the total gallons by 7.48. To convert cubic feet to gallons, multiply the cubic feet by 7.48.

How do you convert SCF to gallons? ›

Conversion of Cubic Foot to Gallon

Value of 1 cubic foot to gallon is approximately 7.48 gallons. To convert cubic feet to gallons, we have to multiply the given value of cubic feet by a factor of 7.48.

How do you convert 10 gallons into cubic feet round your answer to the nearest hundredth? ›

Final answer:

To convert 10 gallons into cubic feet, multiply by the conversion factor of 0.13368. Rounded to the nearest hundredth, the answer is 1.34 cubic feet.

How much water can 1 cubic feet hold? ›

Question 1: How much water can 1 cubic foot hold? Answer: 1 cubic feet can be considered as the cube of dimension 1 ft × 1 ft × 1 ft. It can hold 28.3168 L or 7.48 gallons of water.

How can I calculate gallons? ›

  1. Formula:
  2. L x W x D. = Cubic Feet.
  3. Cubic ft x 7.47. = Gallons.

How much cubic volume is a gallon? ›

the US gallon (US gal), defined as 231 cubic inches (exactly 3.785411784 L), which is used in the United States and some Latin American and Caribbean countries; and.

How much water is 100 cubic feet? ›

One cubic foot of water is equivalent to 7.48 gallons. One hundred cubic feet would equal 748 gallons.

How to calculate cubic feet? ›

To calculate the cubic feet of a package, you need to multiply the length x width x height. For example, the cubic feet formula for 1 cubic foot equals 1 foot x 1 foot x 1 foot, giving you the volume of a cube.

How many gallons is 100 cubic? ›

There are 748 gallons in 100 cubic feet.

How many cubic feet fills 10 gallons? ›

Plastic Container Volume Chart
SizeGallonsCubic Feet
5 Gallon5.000.935
7 Gallon7.041.131
10 Gallon12.742.038
20 Gallon22.233.566
5 more rows

How heavy is a gallon of water? ›

One gallon of water weighs approximately 8.34 pounds (3.78 kilograms) at room temperature. This weight can vary slightly with temperature because the density of water changes with temperature, but the figure of 8.34 pounds is a good approximation for most everyday purposes.

What does 1 cubic foot of water weigh? ›


1 Cubic Ft. = 62.41 Lbs. 1 Gallon = 8.34 Lbs.

How do you calculate volume of water? ›

Length x width x depth x 7.5 = volume (in gallons)

Multiplying that by the depth gives the volume in cubic feet.

How do you calculate cubic volume? ›

The good news for a cube is that the measure of each of these dimensions is exactly the same. Therefore, you can multiply the length of any side three times. This results in the formula: Volume = side * side * side. It is often written as V = s * s * s or V = s^3.

How much is 1 cubic feet of liquid? ›

1 Cubic Foot = 29.9221 Liquid Quart (US)

The US liquid quarts is the measurement of the volume of fluid which is equal to one-fourth of a gallon. It is a US customary measurement of volume.

How many gallons is 1 cubic foot dry? ›

Conversion table of the cubic foot to Dry gallon
Cubic Foot (ft3)Dry Gallon
6 more rows
Jan 10, 2024

How do you convert 1 CFS to gallons? ›

How to convert Cubic feet per second to Gallons per hour. 1 Cubic feet per second (ft3/s) is equal to 26929.85625 Gallons per hour (gal/h).

How many cubic feet is a 5 gallon bucket of water? ›

The average 5 gallon bucket contains between 1,155 and 1,387 cubic inches. How Many Cubic Feet Is a 5 Gallon Bucket? The average 5 gallon bucket contains between 0.66 and 0.8 cubic feet.


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