Square Feet to Cubic Feet Calculator
Convert square feet to cubic feet at a depth, or cubic feet back to the square feet they cover.
Change the values and press Calculate to work out your own figures.
Area and depth
Enter the area and its depth.
Show the working
- volume = area × depth
Cubic feet to square feet
Enter the volume and the depth.
Show the working
- area = volume ÷ depth
How to use it
Enter the area and its depth. Enter the volume and the depth.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
cubic feet = square feet × depth (ft) square feet = cubic feet ÷ depth (ft)
Depth in inches
Divide inches by 12 to get feet: 4 inches is 1/3 ft, so 120 sq ft at 4 in is 40 cu ft.
Questions
How many cubic feet is 120 sq ft at 4 in?
40 cubic feet.
Formulas
cubic feet = square feet × depth (ft) square feet = cubic feet ÷ depth (ft)
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.