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Cubic Feet Calculator

Find box or cylinder volume in cubic feet, cubic yards, cubic meters, and U.S. gallons.

Calculated and reviewed by HomeTaskKit Editorial Team ·
Quick answer

Rectangular cubic feet equal length × width × height; cylinder volume uses π × radius² × height. The calculator also converts the same volume to cubic yards, cubic meters, and U.S. gallons.

Your planning estimate48 cubic feet

1.78 yd³ · 1.36 m³ · 359.1 U.S. gal.

Measured need48 ft³ per boxBuy / plan48 ft³ total volume
Formula: length × width × height × quantity

Use inside dimensions for capacity and outside dimensions for shipping or storage space. Irregular shapes should be split into simple sections and added.

Use it well

Step by step

  1. 1

    Choose a box or cylinder and measure the inside dimensions when estimating usable container capacity.

  2. 2

    Keep all dimensions in one unit system and check whether you entered diameter or radius.

  3. 3

    Use the converted result as geometric volume; usable capacity may be lower because of fill limits or irregular contents.

Worked example

Check the estimate before you buy

Calculate box or cylinder volume in cubic feet and instantly convert the result to cubic yards, cubic meters, and U.S. gallons.

Example

A rectangular space 6 ft long, 4 ft wide, and 2 ft high contains 48 cubic feet. That is about 1.78 cubic yards, 1.36 cubic meters, or 359 U.S. gallons.

How the calculation works

Boxes use length × width × height. Cylinders use π × radius² × height. The result is multiplied by quantity and converted with fixed unit factors.

Planning checklist

Before you place the order

  • Use inside dimensions for storage capacity and outside dimensions for shipping space.
  • Split irregular objects into simple boxes or cylinders and add their volumes.
  • Use a material-specific calculator when density, compaction, bags, or waste affect purchasing.
Common questions

Cubic Feet Calculator FAQ

How many cubic feet are in a cubic yard?

One cubic yard contains 27 cubic feet.

How do I find cubic feet from inches?

Multiply the three dimensions in inches and divide by 1,728, because one cubic foot contains 1,728 cubic inches.

Does cubic footage equal usable capacity?

Not always. Walls, rounded corners, packing gaps, equipment, and inaccessible spaces can reduce usable capacity.

Can I calculate a round container?

Yes. Select cylinder, enter its diameter and height, and use inside dimensions for capacity.

Source & method

Reference: NIST Handbook 44 units and measurement tables. Results are practical estimates; complete labels, package directions, product specifications, and qualified professional advice take priority.