# Square Feet and Cubic Feet

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## How to convert square feet to cubic feet

**
To convert square feet to cubic feet, multiply your square feet figure by the missing dimension, which is commonly the height/depth. This assumes
that the height measurement is in feet. If it isn't, convert it to feet before making the calculation.
**

The square foot is a unit of area (two dimensions) and is commonly calculated by
multiplying width and length together. The cubic foot is a unit of volume (three dimensions) - commonly
calculated by multiplying width, length and height measurements together.
This means that it is not a *conversion* as such, as we are not comparing like for
like - one has two dimensions, the other has three.

To calculate cubic feet based upon a square feet figure requires us to know an extra dimension: height/depth. You could, in theory, fit many different measurements of square feet into a cubic foot. Picture a swimming pool - it could be very long, wide and shallow. Or, it could be shorter in length and width and be very deep. Both of these swimming pools could, in theory, have the same cubic feet volume. But, their surface area would be very different.

Here's an example of two boxes, both measuring 6 cubic feet.

Your reasons for wanting to calculate cubic feet from a square feet figure may vary. One common reason is for landscaping. You might want to buy mulch or topsoil for your garden - these materials are commonly sold in cubic feet or cubic yards.

### Square feet to cubic feet formula

**Note:** this formula assumes all measurements are in feet.

### Example calculation

Let's say you have a garden measuring 20 square feet, and you want to cover it in 3 inches of topsoil. The topsoil you want is sold by the cubic foot, so we need to do a conversion and calculation.

- Convert our depth figure from inches to feet (so that units are the same). There are 12 inches in a foot. 3 ÷ 12 = 0.25 ft.

Our topsoil depth is 0.25 ft. - Cubic feet = square feet × depth.

So: 20 × 0.25 = 5. - We have our total:
**5 cubic feet**.

## How to convert cubic feet to square feet

**
To convert cubic feet to square feet, divide your cubic feet figure by one of the dimensions - commonly the height. To make this calculation work, your
height figure needs to be in feet.
**

As we discussed earlier in our article, it is important to note that this is not a conversion as such, due to the fact that a cubic foot is a unit of volume (three dimensions) and a square foot is a unit of area (two dimensions). So, you're not comparing like for like. In order to calculate how many square feet of area there are in your cubic feet of volume, you need to know the measurement of one of the dimensions, in feet.

In our calculator, above, we've stated this as 'height', but it could equally be length or width, depending on which side of the object you're trying to measure. Once you have one of the dimensions, your calculations can be carried out using the formulae below.

**Note:** this formula assumes all measurements are in feet.

### Cubic feet to square feet formula

### Example calculation

Using our topsoil example above, and working backwards, you'll see how it works. As a reminder, we have 5 cubic feet of top soil and a depth of 0.25 feet (3 inches). What is the square feet measurement?

- Square feet = cubic feet ÷ depth.

So: 5 ÷ 0.25 = 20. - We have our total:
**20 square feet**.

Of course, if you use our calculator at the top of the page, it'll work these calculations out for you.

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