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.
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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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.
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.
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.
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.
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.
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.
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.
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.