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Cubic Feet Calculator

Calculate cubic feet volume for shipping, moving, storage, and construction. Free online cubic feet calculator with multiple shapes and unit conversions.

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What is the Cubic Feet Calculator?

A cubic feet calculator helps you quickly determine the volume of an object or space in cubic feet. Whether you are shipping a package, ordering gravel, calculating refrigerator capacity, or estimating concrete for a project, this tool provides instant volume calculations in cubic feet, cubic yards, cubic meters, cubic inches, and liters.

Simply select the shape that matches your object — box, cylinder, pipe, or pyramid — enter your measurements, and the calculator instantly computes the volume. You can also calculate the total cost by entering a price per cubic foot, cubic yard, or cubic meter.

How to Use the Cubic Feet Calculator

Choose the shape that best matches your object. For a rectangular box, enter the length, width, and height. For a cylinder, provide the diameter and height. For a pipe or tube, enter the outer and inner diameters along with the length. For a pyramid or cone, enter the base area and height.

Select your preferred unit of measurement — inches, feet, yards, millimeters, centimeters, or meters. The calculator automatically converts all dimensions to feet and computes the volume. Use the quantity field to multiply the result for multiple identical objects.

Toggle the cost section to enable pricing. Enter a price per cubic foot, cubic yard, or cubic meter, and choose your currency. The estimated total cost displays instantly.

How to Calculate Cubic Feet Manually

The formula for a rectangular box is:

Cubic Feet = Length (ft) × Width (ft) × Height (ft)

For a cylinder, use the formula: π × (diameter/2)² × height. For a pipe, calculate the outer cylinder volume minus the inner cylinder volume. For a pyramid, multiply the base area by the height and divide by 3. The cubic feet calculator above performs all these calculations instantly.

To convert inches to feet, divide by 12. To convert cubic feet to cubic yards, divide by 27. One cubic foot equals approximately 7.48 gallons or 28.32 liters.

Common Applications

Cubic feet measurements are used across many industries. Moving companies use them to estimate truck space. HVAC technicians calculate room volume for duct sizing and air conditioning capacity. Shippers use cubic feet to determine freight class and shipping costs. Woodworkers and builders calculate lumber volume. Even aquarium enthusiasts use cubic feet to determine tank capacity.

For more volume and conversion tools, try the Cubic Yards Calculator, Cubic Feet to Cubic Yards Converter, and Volume Calculator.

Frequently Asked Questions

How many cubic feet are in a cubic yard?

There are 27 cubic feet in one cubic yard. This is because a cubic yard is 3 feet wide, 3 feet deep, and 3 feet high (3 x 3 x 3 = 27). To convert cubic feet to cubic yards, simply divide the cubic foot value by 27.

How do I convert inches to cubic feet?

First convert all inch measurements to feet by dividing by 12, then multiply length x width x height. Alternatively, calculate the volume in cubic inches (length x width x height in inches) and divide by 1,728 (12 x 12 x 12) to get cubic feet.

What is the difference between cubic feet and square feet?

Square feet measure area (a two-dimensional surface), while cubic feet measure volume (three-dimensional space including height or depth). For example, a 10 ft x 10 ft room is 100 square feet, but if the ceiling is 8 ft high, the room volume is 800 cubic feet.

How many gallons are in a cubic foot?

There are approximately 7.48 US gallons in one cubic foot. This conversion is useful for calculating water tank capacity, aquarium volume, or liquid storage requirements.

How is cubic feet used in shipping?

Shipping companies use cubic feet to determine dimensional weight (DIM weight), which affects shipping costs. The formula is Length x Width x Height (in inches) divided by a DIM factor (typically 139 for domestic shipping). Larger, lighter packages are billed by dimensional weight rather than actual weight.

Can I calculate cubic feet for irregular shapes?

Yes. Divide the irregular space into simpler shapes (rectangles, cylinders, etc.), calculate each volume separately, and add the results. The calculator above supports boxes, cylinders, pipes, and pyramids to help you break down complex objects.

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