Free tool

Cubic feet calculator

Length times width times height, worked out live. Measure in feet or in inches, and see the same volume in cubic yards and cubic meters.

fx=B2*B3*B4
AB
1Measured in feet
2Length (ft)
3Width (ft)
4Height (ft)
5Cubic feet640
6Cubic yards23.7
7Cubic meters18.12
8
9Measured in inches
10Length (in)
11Width (in)
12Height (in)
13Cubic feet3
14
15Cylinder (tank, pipe, column)
16Diameter (ft)
17Height (ft)
18Cubic feet12.57

Blue cells are inputs: type a new value and the sheet recomputes. Click a result to see its formula.

The formulas

How it works, step by step

=B2*B3*B4
Cubic feet from feet. Multiply length, width and height, all in feet: a 10 × 8 × 8 ft room holds 640 cubic feet.
=B10*B11*B12/1728
Cubic feet from inches. Multiply the three sides in inches to get cubic inches, then divide by 1,728, the number of cubic inches in a cubic foot (12 × 12 × 12). A 24 × 18 × 12 in box is 3 cubic feet.
=B5/27
Cubic yards and cubic meters. A cubic yard is 3 × 3 × 3 = 27 cubic feet, the unit concrete, soil and mulch are sold in. For cubic meters, multiply by 0.3048³ (a foot is 0.3048 m), about 0.0283.
=PI()*(B16/2)^2*B17
A cylinder. The area of the circle (π × radius²) times the height. The radius is half the diameter: a tank 2 ft across and 4 ft high holds about 12.57 cubic feet.

Functions used here

PRODUCTProduct of valuesPIThe number pi (3.14159…)POWERBase raised to a powerCONVERTConvert between units of measurement

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FAQ

Questions

How do you calculate cubic feet?

Measure length, width and height in feet and multiply them. A space 10 ft long, 8 ft wide and 8 ft high is 10 × 8 × 8 = 640 cubic feet.

How do I convert inches to cubic feet?

Multiply the three measurements in inches and divide by 1,728. A box of 24 × 18 × 12 inches is 5,184 cubic inches, which is 3 cubic feet.

How many cubic feet are in a cubic yard?

27, because a cubic yard is 3 feet on each side. Divide cubic feet by 27 to get cubic yards: 640 cubic feet is about 23.7 cubic yards.

How do I get cubic feet when the measurements are mixed?

Convert everything to the same unit first. 6 inches is 0.5 ft, so a slab 10 ft by 10 ft and 6 in thick is 10 × 10 × 0.5 = 50 cubic feet.

How do I calculate the volume of a round tank?

Use π × radius² × height with everything in feet. A tank 2 ft across (radius 1 ft) and 4 ft high is about 12.57 cubic feet.

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