A free square footage calculator for any room or shape, in square feet, square meters and square yards.
Work out the square footage of any room or shape, in feet or meters, and add up as many areas as you like.
Your numbers
Add an area for each room or shape, and they're added up. A circle takes the distance across it.
Your result
Fill in the fields above to see your result.
Embed this tool on your site
Paste the code into any page: WordPress, Webflow, Squarespace, Ghost or plain HTML. It's free with the credit under it, which links back to navid.me.
This free square footage calculator works out the area of any room or space, in square feet, square meters and square yards.
It takes rectangles, circles and triangles, so an L-shaped room is just 2 rectangles added up.
I built it because flooring, paint and furniture all start from the same number, and odd-shaped rooms are where the math goes wrong.
Here's the formula for each shape, a worked example, and the mistakes to avoid.
TL;DRKey takeaways
What is a square footage calculator?
A square footage calculator works out the area of a floor, a wall or a plot of land in square feet.
It's the first number for flooring, paint, tiles, and the size on a home's listing.
How square footage works
Each shape has its own formula. NIST Handbook 44 defines the foot as exactly 0.3048 meters, so the metric answer is exact too.
| Shape | Area |
|---|---|
| Rectangle | Length × width |
| Circle | π × (across ÷ 2)² |
| Triangle | Base × height ÷ 2 |
A worked example
Here's the example the calculator loads: a 12 by 10 foot bedroom, a 14 by 12 foot living room, and a round area 6 feet across.
120 + 168 + 28.3 = 316.3 square feet, or 29.38 square meters.
Mistakes to avoid
These are the slips that come up most.
- Multiplying an L-shaped room's 2 longest sides together
- Mixing feet and inches: 10 feet 6 inches is 10.5 feet
- Using the distance across a circle as its radius
Who is the square footage calculator for?
It's for anyone planning a floor, a paint job or a move, and these tools help around it.
- Flooring calculator – for the flooring to buy
- Paint calculator – for the paint a room takes
- Tile calculator – for the tiles and boxes
Measure once, and every project after starts from the right number.
Plan your money with your AI
Take your numbers further in
Square Footage Calculator FAQs
Questions about the square footage calculator? Here's what to know.
A square footage calculator works out the area of a room or space in square feet.
Multiply the length by the width, both in feet.
144 square feet.
Split it into 2 rectangles, work out each one, and add them up.
About 10.764 square feet.
9 square feet, since a yard is 3 feet.
Halve the distance across, square it, and multiply by π.
A circle 6 feet across is about 28.3 square feet.
Yes, it's free with no sign-up.
It runs in your browser, and your numbers stay on your device.
I did.
I'm Navid Moazzez, and I made the square footage calculator as one of my free tools on navid.me.
More about me.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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