Square Feet to Cubic Feet Calculator

Use this square feet to cubic feet calculator when you already know an area. Multiply the area in square feet by the depth, converted from inches to feet by dividing by 12, to get cubic feet. A 500 sq ft area at 4 in. deep comes to 166.67 cubic feet.

Last reviewed September 2026Method & sources Report an error

Volume

166.67 cu ft

Breakdown
Volume	166.67 cu ft

How to Calculate Square Feet to Cubic Feet

Starting from an area you already know (rather than separate length and width measurements), multiplying by depth converts it to volume. Depth is converted from inches to feet first, since area is in square feet.

Example: 500 sq ft area, 4 in. deep

A 500 sq ft area, 4 in. deep: 1. Depth in feet: 4 ÷ 12 = 0.333 ft 2. Volume: 500 × (4 ÷ 12) = 166.67 cu ft

What Is Square Feet to Cubic Feet?

A square feet to cubic feet calculator is for when you already know a space's area (from a floor plan, a room's listed square footage, or a previous calculation). You only need to add a depth or height to get volume, without re-entering length and width separately as the plain Cubic Feet calculator requires.

Square Feet to Cubic Feet: Pros and Cons

Pros

Skips re-entering length and width when you already know the total area
Takes depth directly in inches, matching how depth is commonly specified for material like mulch, gravel, or concrete
A direct, exact conversion once area and depth are known

Cons

Doesn't calculate area for you. Use the Square Footage calculator first if you don't already have this figure
Doesn't convert to cubic yards. Use the Cubic Yards calculator or the Cubic Yards to Tons converter for that unit
Assumes a uniform depth across the whole area. A sloped or variable-depth space needs its volume estimated in sections

Frequently Asked Questions

How do I convert square feet to cubic feet?

Multiply the area by the depth (converted to feet). A 500 sq ft area at 4 in. deep is 500 × (4 ÷ 12) = 166.67 cu ft.

Why do I need depth to convert square feet to cubic feet?

Because square feet measures a flat area (two dimensions), while cubic feet measures volume (three dimensions). You need a third dimension, depth or height, to make that conversion.

What if my depth is already in feet, not inches?

Multiply area directly by depth in feet, and skip the ÷12 step. This calculator assumes depth is entered in inches, the more common way material depth is specified.

How is this different from the plain Cubic Feet calculator?

The plain Cubic Feet calculator takes length and width as separate inputs and multiplies them together with height. This calculator is for when you already have a single area figure and just need to add depth, skipping that extra step.

Can I convert the result to cubic yards?

Yes. Divide the cubic feet result by 27, or use the Cubic Yards calculator directly if you want to start from length and width instead of a known area.

Measurement