How to Measure Cubic Feet: A Simple Step-by-Step Guide

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Knowing how to measure cubic feet is a crucial skill for homeowners, movers, DIYers, and anyone needing to calculate volume. Whether you’re measuring a storage space, a box, or even a room, calculating cubic feet helps ensure you know exactly how much space you’re working with.

This guide explains how to measure cubic feet, includes practical examples, shows you how to convert from inches and other units, and provides calculators you can use directly on the page.

Table of Contents

Understanding How to Measure Cubic Feet

To get the cubic feet of any square or rectangular object, measure length, width and then height in feet. After this multiply them together, as the following formula shows.

To measure cubic feet, use this simple formula:

Length × Width × Height = Cubic Feet

This means you need to measure the length, width, and height of the object or space in feet, then multiply those three numbers together. The result is the total volume in cubic feet (ft³).

how to measure cubic feet
How to Measure Cubic Feet

Example of How to Measure Cubic Feet using Feet Measurements

For a box measure length, width and height in feet. In this example these measurements are 3 feet long, 2 feet wide, and 4 feet high. Finally calculate cubic feet as follows.

3 × 2 × 4 = 24 cubic feet

This means the box has a total volume of 24 cubic feet.
This method works for any rectangular object, such as storage boxes, furniture, or rooms.

Example of How to Measure Cubic Feet from Inches

If your measurements are in inches instead of feet, first multiply the length, width, and height (in inches) to get the total cubic inches. Then divide that number by 1,728, since there are 1,728 cubic inches in one cubic foot.

For example, imagine a box that’s 36 inches long, 24 inches wide, and 48 inches high.
You calculate cubic feet as follows:

36 × 24 × 48 = 41,472 cubic inches
41,472 ÷ 1,728 = 24 cubic feet

You’ll notice this gives the same result as the example measured directly in feet.

Cubic Feet Calculator

Below are two convenient calculators you can use directly to find the volume in cubic feet — one for feet-based measurements and another for inches-based measurements.

Cubic Feet Calculator: Feet Measurements

Measure the length, width, and height in feet and enter the values below. Click Calculate to get the volume in cubic feet.

Cubic Feet Calculator

Enter the dimensions below in feet to calculate the volume.

Cubic Feet Calculator: Inches Measurements

Measure the length, width, and height in inches and enter the values below. Click Calculate to get the volume in cubic feet.

Cubic Feet Calculator

Enter the dimensions below to find the volume in cubic feet.

How to Calculate Cubic Feet from Inches or Other Units

Sometimes your measurements might be in inches, centimeters, or meters instead of feet. To ensure accuracy, you’ll need to convert them before using the cubic feet formula.

Converting Inches to Feet

Divide inches by 12.
Example:
36 inches ÷ 12 = 3 feet.

Converting Centimeters to Feet

Divide centimeters by 30.48.
Example:
100 cm ÷ 30.48 ≈ 3.28 feet.

Converting Meters to Feet

Multiply meters by 3.281.
Example:
2 meters × 3.281 = 6.56 feet.

Once all your measurements are in feet, use:
Length × Width × Height = Cubic Feet

How to Measure Cubic Feet for Odd Shapes

Not all objects are box-shaped. If you need to measure cubic feet for curved or irregular objects, use these alternative methods.

How to Measure Cubic Feet for Cylindrical Objects

Use the formula:
π × radius² × height = cubic feet
(π = 3.1416)

Make sure the radius and height are measured in feet.

how to measure cubic feet for a cylinder
How to Measure Cubic Feet for a Cylinder

How to Measure Cubic Feet for Irregular Shapes

Break the shape into smaller, measurable sections such as cubes or cylinders. Calculate each section separately and then add the totals together to get the overall cubic feet.

How Do You Find Cubic Feet for Moving and Storage?

Movers often ask for cubic feet to estimate how much space your items will take in a truck or storage unit. Follow these steps:

  1. Measure each item’s length, width, and height in feet.
  2. Multiply the dimensions to get the item’s volume in cubic feet.
  3. Add the cubic feet of all items together.

Knowing how to calculate cubic feet from feet ensures accurate moving quotes and helps avoid overloading a space.

How to Measure Cubic Feet for Shipping

Shipping companies often use CFT (Cubic Feet) to calculate shipping costs.
To find your package’s cubic feet:

  1. Measure the length, width, and height in feet.
  2. Multiply: Length × Width × Height = Cubic Feet (CFT)
  3. Round up if required by the carrier.

Accurate cubic feet measurements can help you estimate shipping costs and ensure your items fit within freight limits.

How Do You Figure a Cubic Foot of Soil, Mulch, or Gravel?

For landscaping or gardening projects, calculating cubic feet helps determine how much soil, mulch, or gravel you’ll need.

  1. Convert all measurements (length, width, and depth) to feet.
  2. Multiply: Length × Width × Depth = Cubic Feet

Example

A garden bed that’s 8 feet long, 3 feet wide, and 1 foot deep:
8 × 3 × 1 = 24 cubic feet of soil needed.

You can then convert cubic feet to cubic yards if required (divide by 27).

Tips on How to Measure Cubic Feet

  • Use consistent units: Don’t mix inches and feet in the same calculation.
  • Round up measurements: For storage or shipping, rounding up ensures you have enough space.
  • Measure twice: Small errors in measurement can significantly affect the final volume.
  • Convert before calculating: Always convert to feet before multiplying.
  • Label your dimensions: Keep track of which measurement is length, width, or height for consistency.
  • Use a calculator: For precise results, use an online cubic feet calculator like the ones provided above.

FAQs About How to Measure Cubic Feet

How do you figure a cubic foot?

A cubic foot is a cube that measures 1 foot on each side. To figure a cubic foot, you multiply 1 ft × 1 ft × 1 ft, which equals 1 ft³. To find the volume of other objects in cubic feet, use the same method with their actual dimensions.

How do you find cubic feet for a room?

Measure the length, width, and height of the room in feet. Multiply the three measurements to get the room’s total cubic feet. This is useful for calculating HVAC needs or storage capacity.

For example:
Measure the length, width, and height of the room in feet, then multiply them.
12 × 10 × 8 = 960 cubic feet.

How to calculate cubic feet from feet?

If you already have the length, width, and height in feet, simply multiply them together:

Length × Width × Height = Cubic Feet

This is the most direct method for calculating volume.

How do you convert cubic inches to cubic feet?

Divide the total cubic inches by 1,728.
Example:
34,560 cubic inches ÷ 1,728 = 20 cubic feet.

How do you calculate cubic feet from meters?

Multiply cubic meters by 35.315 to convert to cubic feet.
Example:
2 m³ × 35.315 = 70.63 ft³.

How to measure CFT for freight?

Measure in feet, then multiply:
Length × Width × Height = CFT.
Use this number on freight documents or to estimate shipping charges.

How many cubic feet are in a cubic yard?

There are 27 cubic feet in one cubic yard.
(3 ft × 3 ft × 3 ft = 27 ft³)

How do I calculate cubic feet for an appliance or refrigerator?

Measure the inside dimensions (width, height, depth) in feet, then multiply.
This tells you how much internal storage space is available.

How do I estimate cubic feet for a truck or container?

Measure the interior dimensions of the truck or container in feet and multiply them together.
If loading multiple items, calculate each item’s cubic feet separately and total them up.

Final Thoughts on How to Measure Cubic Feet

Whether you're packing, planning, or purchasing, knowing how to measure cubic feet ensures you make informed decisions. From home storage and shipping to landscaping and moving, the ability to calculate volume is practical and essential.

Related post: How to Measure Cubic Yards

Bookmark this guide for quick reference, and check out our other measurement tutorials in the Measuring Tools & Basics category for everyday tasks made simple.