Cubic Feet Calculator

Enter your dimensions in length, width, and height — choose your unit (inches, feet, yards, cm, or meters) — and get the volume in cubic feet right away. The Cubic Feet Calculator handles all unit conversions for you, so you can mix and match as needed. Also see the breakdown in cubic inches, cubic yards, and cubic meters for extra flexibility.

Select the unit your measurements are in

Number of identical units (e.g. boxes)

Enter a price to calculate total material cost

Results

Volume (Cubic Feet)

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Cubic Inches

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Cubic Yards

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Cubic Meters

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Total Volume (× Quantity)

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Total Material Cost

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Volume Across Unit Types

Frequently Asked Questions

How do you calculate cubic feet?

To calculate cubic feet, multiply the length × width × height of the object, with all measurements in feet. The formula is: Volume (ft³) = Length (ft) × Width (ft) × Height (ft). If your measurements are in other units, convert them to feet first — or use this calculator which handles unit conversion automatically.

How do I calculate cubic feet from inches?

Multiply your length, width, and height dimensions in inches together, then divide the result by 1,728 (since 1 foot = 12 inches, and 12³ = 1,728). For example, a box that is 24 in × 12 in × 36 in = 10,368 in³ ÷ 1,728 = 6 ft³. This calculator does that division for you automatically when you select 'Inches' as the unit.

What's the difference between cubic feet and square feet?

Square feet measure area — a two-dimensional surface (length × width). Cubic feet measure volume — a three-dimensional space (length × width × height). For example, a floor might be 100 square feet, but the room's volume would be 100 sq ft × ceiling height in feet to get cubic feet.

Can I calculate cubic feet when my measurements are in different units?

This calculator requires all three dimensions to be in the same unit. Simply select the unit your measurements are in, enter all three values, and the calculator converts the result to cubic feet. If you have mixed units (e.g. some in inches and some in feet), convert everything to a single unit first, then enter the values.

How do movers calculate cubic feet?

Movers typically measure each item's length, width, and height in feet and multiply those three values together to get the cubic footage of that item. They then add up the cubic footage of all items to estimate the total volume of a move. Knowing the total cubic feet helps determine what truck size you need.

How many cubic feet are in a cubic yard?

There are 27 cubic feet in one cubic yard, because 1 yard = 3 feet, and 3 × 3 × 3 = 27. So to convert cubic feet to cubic yards, divide by 27. This is commonly used when ordering materials like concrete, mulch, or soil.

How do you calculate cubic feet for HVAC or air conditioning?

For HVAC purposes, measure your room's length, width, and ceiling height in feet and multiply them together. For example, a 15 ft × 20 ft room with 9 ft ceilings is 2,700 cubic feet. HVAC professionals use this volume to determine the right capacity of heating and cooling equipment for the space.

How do you calculate cubic feet of concrete?

Measure the length, width, and depth (thickness) of the area you want to pour in feet, then multiply them together. For a slab that is 10 ft × 10 ft × 0.5 ft (6 inches thick), the volume is 50 cubic feet. Divide by 27 to convert to cubic yards if your concrete supplier quotes in cubic yards.

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