The cubic foot is an important unit to measure the volume of solid objects and plays an extensive role in the field of construction and civil engineering. It is used to calculate the volume of concrete needed for a foundation and the space for insulation in a house.

It helps to tell the internal space of the different objects such as the cylinder, container, room, and long vehicle that are used to transfer the goods from one city (or country) to another city (or country). 

In this article, we will discuss the basics of cubic feet, the calculation involving cubic feet, and the Application of cubic feet. Furthermore, for a better understanding of cubic feet will solve different examples of cubic feet.

Definition of Cubic feet

A cubic foot is the unit of volume for a cube with boundaries that measure one foot in length. It represents the volume of a three-dimensional shape and is used to determine the capacity of an object. 

One cubic foot is equal to 7.48 gallons or 28.32 liters. The abbreviation for cubic feet is ‘cu ft’ or ‘ft³’. Moreover, cubic feet can be easily converted to other units of measurement, helping communication across different industries. Using cubic feet for exact volume measurements can help save time, money, and resources in various applications.

Cubic Feet Formula

To calculate the volume in cubic feet you have to measure the length, width, and height of an object in feet. The formula for calculating cubic feet is:

  • Cubic feet (ft3) = length x width x height 
  • Cubic feet (ft3) = L x W x H


  • L” is the length, 
  • W” is the width, 
  • H” is the height

For example, measure the cubic feet of a box, if the length of a box is 9 feet, the width is 15 feet, and the height is 1.25 feet, 

Then, cubic feet = 9 x 15 x 1.25 = 168.75 ft3. 

Conversion for cubic feet

The different conversions used from the different units to cubic feet.

Cubic Feet (ft³)Inches³LitersGallonsMeters³
1  ft³17280.047.480.03
10  ft³172800.3574.810.28

How to Find Volume in Cubic Feet? 

Here are a few simple steps to find cubic feet.

  • Measure the length, width, and height of the object in feet.
  • Calculate the volume by multiplying these measurements together:

Volume = Length × Width × Height

Alternatively, use Allmath’s cubic feet calculator for finding volume in cubic feet with steps to avoid time-consuming manual calculations.

This gives you the volume in cubic feet (ft³).

Example 1:

Evaluate the volume of the drawing room in cubic feet if a room with a width of 10 ft, a length is 15 ft, and a height is 19 ft.


Step 1: Write the values of length, width, and height from the above data.

Length = 15 ft, width = 10 ft, 

Height = 19 ft, v =?

Step 2: Put all values in the formula of cubic feet to find the volume of the room and simplify.

L = 15, W = 10, H = 19

Cubic feet (ft3) = V = L x W x H

       = 15 x 10 x 19 

Cubic feet (ft3) = V = 2850 ft3

Example 2:

Find the volume of the basement room in cubic feet if its height is 36 ft, its length of 10 ft, and its width is 8 ft.


Step 1: Write the values of length, width, and height from the above data.

Length = 10 ft, width = 8 ft

Height = 36 ft, v =?

Step 3: Put all values in the formula of cubic feet to find the volume of the room and simplify.

L = 10, W = 8, H = 36

Cubic feet (ft3) = V = L x W x H

       = 10 x 8 x 36

Cubic feet (ft3) = V = 2880 ft3

Application of Cubic Feet in Engineering and Construction

Cubic feet help to find the volume of the solid objects that ensure to determine the total cost to construct the object and determine the total quantity of material required to construct the object. 

It is also useful in architecture and interior design to estimate the amount of materials required for any project and tell the total space construction project.

It plays an important role in the field of civil and electrical engineering designs to measure the volumes of different objects. Here we discuss some important uses of cubic feet in engineering and construction.

  • Material Estimation and Costing 

Cubic foot measurements are useful to determine the amount of materials necessary for the completion of the projects. This helps to tell us the total concrete (foundations, slabs, beams), and total number of bricks required for the walls of the whole building.

  • Project Planning and Scheduling

By calculating the volume of materials, the required construction specialist and engineer can establish a project completion timeline. That can help us with the exact amount of concrete needed for the foundation and avoid delays caused due to excess materials or shortage of materials.

  • Structural Load Analysis and Design

Civil engineers with the help of cubic feet measure the weight and load-bearing capacity of structures by Calculating the volume of concrete or steel used in beams, columns, and slabs. It helps us to determine the overall weight of the structure that can specify load limits based on the area and volume of specific structural elements.

  • Quantifying Materials

Cubic feet help us for the estimation of the exact amount of materials needed for construction including concrete, bricks, lumber, and excavation materials. Measuring the accurate amount of material can avoid overspending due to excess materials and minimize material waste, which is very helpful for cost savings.

Wrap up:

In this article, we discussed the basic definition and application of cubic feet in the engineering or construction field. The measurements of the Cubic feet are helpful for accurate material estimation, cost control, structural design, and efficient construction site management. 

A strong understanding of cubic feet calculations and determining the volume of the object is essential for anyone involved in construction and civil engineering, which helped us for the success and safety of projects.