# How to calculate square footage

Sweeping your problems under the carpet? Perplexed by your floors? “Expert” Alex Plainett gives advice on everything from grout griping to tile tantrums. In this edition, Alex answers the age-old question: How big is a square foot?

I’ve moved into my childhood home, which is fantastic, except that when my parents moved to retire in California, their poodles left the living room carpet in a mess. I obviously want to get new carpet, but I keep reading that I have to find the square footage of the room to know how much carpet to buy. My geometry notebooks might still be in the attic—but, Alex, can you just tell me how big is a square foot, and what it is in plain English?

Signed,Square Footage Is for Squares

Thanks for writing! No matter how long ago you learned geometry (or even if you never did), it’s still handy to be able to figure out square footage. You’ll need that knowledge for lots of things, like buying new flooring, selling your house, and choosing an apartment.

When it comes to buying carpet, the point of knowing how big a square foot is, is to be able to measure how much carpet you need—which can help avoid carpet seams.

The good news? You can use a square-foot calculator online.

But it’s not that intimidating to figure out what a square foot is. There’s a simple formula you can use, even if you’re no math wiz:

length x width = square footage

If that still looks like another language to you, here’s how you can do it yourself:

• Get a measuring tape and measure the width of the room from wall to wall at the widest part. Write that number down.
• Now measure the length from the longest part, wall to wall. Write it down.
• Multiply the two numbers together, and there’s your square footage!