Navid MoazzezNavid Moazzez
Conseil en IA

Free Square Footage Calculator (+ Guide)

A free square footage calculator for any room or shape, in square feet, square meters and square yards.

Navid Moazzezpar Navid Moazzez·Mis à jour 3 oct. 2026·2 min de lecture·
Square footage of any space
Video on Coverr

Work out the square footage of any room or shape, in feet or meters, and add up as many areas as you like.

1

Your numbers

Add an area for each room or shape, and they're added up. A circle takes the distance across it.

2

Your result

Fill in the fields above to see your result.

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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.

key_takeaways.mdTL;DR

Key takeaways

A rectangle's area is length × width: a 12 by 10 foot room is 120 square feet.
A circle's area is π × (across ÷ 2)², and a triangle's is base × height ÷ 2.
Split an L-shaped or odd room into simple shapes, and add them up.
1 square meter is about 10.764 square feet, and 1 square yard is 9 square feet.

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.

ShapeArea
RectangleLength × width
Circleπ × (across ÷ 2)²
TriangleBase × height ÷ 2
Measure a space0/4

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.

Measure once, and every project after starts from the right number.

Plan your money with your AI

Take your numbers further in

ChatGPTClaudeGeminiGrokPerplexity

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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