Square Footage Calculator

How to work out square footage

1. Enter the length and width of the space.
2. Choose the unit you measured in.
3. Set the number of rooms if you are adding several.
4. Read the area in square feet and square metres.

What square footage is

Square footage is the area of a flat space, found by multiplying length by width. This square footage calculator takes those two measurements in feet, metres, inches, or yards, and gives the result in square feet and square metres so you can use whichever your project needs. As a sq ft calculator, working out the square footage of a room, or any room size, is the first step for flooring, paint, and many other jobs.

Measuring an irregular space

Many rooms are not simple rectangles. The trick is to split the space into rectangles, work out each one's area, and add them together. For an L-shaped room, treat it as two rectangles. Use the room count field to total several rooms at once, or add the areas yourself for odd shapes. Always measure in the same unit throughout.

Adding a margin for materials

The raw square footage is the exact floor area, but for buying materials you usually need more. A waste margin covers cuts, offcuts, breakages, and future repairs, and it is commonly around 10% for flooring and tiles. So take the square footage here, then add your margin before ordering. The tile calculator does this step for you.

A worked example

A room 12 feet long and 10 feet wide has an area of 12 times 10, which is 120 square feet. In metres, a room 4 by 3 is 12 square metres. Enter your own measurements to see both units at once.

FAQ

How do I calculate square footage?

Multiply the length by the width in feet. For a 12 by 10 room, that is 120 square feet. The tool also converts to square metres and square yards.

How do I find the square footage of a room in metres?

Measure in metres and choose the metres unit. The tool multiplies length by width to give square metres, and also shows the square-feet equivalent.

How do I measure an irregular room?

Split it into rectangles, find each area, and add them. For a few separate rooms, use the room count to total them.

How much extra should I buy for flooring?

A common rule is to add about 10% for waste and cuts, more for complex or diagonal layouts. Work out the square footage here, then add your margin.

Is my information private?

Yes. Everything is calculated in your browser and nothing you enter is uploaded or saved.