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Square Footage Calculator

Calculate floor area from length and width, total multiple rooms, and convert to square metres.

Renovating a roomStep 1 of 5

Best for: Use it when buying flooring, carpet or paint, comparing listed home sizes, estimating rent per square foot, or planning a layout.

Purpose: Calculate floor area from length and width, total multiple rooms, and convert to square metres.

Complete guide
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How it's calculated & sources
The Square Footage Calculator uses the standard method for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Square Footage?
A square footage calculator finds the floor area of a room or space from its length and width, and totals multiple identical rooms - handy for flooring, paint, rent and real-estate listings.
Why does Square Footage matter?
The result is the floor area. For flooring or paint, add a waste allowance (typically 5-10%); for irregular rooms, split the space into rectangles, measure each, and add them up.
How is Square Footage calculated?
Area equals length times width. For several identical rooms, multiply by the number of rooms. The tool also shows the equivalent in square metres. Formula: Area = Length x Width (total = area x number of rooms).
What is a good square footage?
1 square metre = 10.764 square feet. A typical US bedroom is about 130-200 sq ft; a one-car garage is around 200-240 sq ft.
What are common square footage mistakes?
Forgetting a waste allowance when ordering flooring or tile.
When should you use the Square Footage Calculator?
Use it when buying flooring, carpet or paint, comparing listed home sizes, estimating rent per square foot, or planning a layout.

What is the Square Footage Calculator?

A square footage calculator finds the floor area of a room or space from its length and width, and totals multiple identical rooms - handy for flooring, paint, rent and real-estate listings.

How the Square Footage Calculator works

Area equals length times width. For several identical rooms, multiply by the number of rooms. The tool also shows the equivalent in square metres.

Area = Length x Width (total = area x number of rooms)

What's a typical value?

1 square metre = 10.764 square feet. A typical US bedroom is about 130-200 sq ft; a one-car garage is around 200-240 sq ft.

Room area (length x width)

10 x 10 ft1009.29
12 x 12 ft14413.38
15 x 20 ft30027.87

Worked example

A 12 ft x 10 ft room = 120 sq ft (about 11.15 sq m).

Common mistakes to avoid

  • Forgetting a waste allowance when ordering flooring or tile.
  • Measuring in mixed units - keep length and width in the same unit.
  • Treating an L-shaped room as one rectangle instead of splitting it into parts.

Keywords: square, footage, area, room, sqft, flooring.

Sources: U.S. NIST - Weights & Measures

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Square Footage Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Square Footage Calculator?+

Square Footage Calculator uses the standard square footage formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Square Footage Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Square Footage Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Title: I built/used this free square footage calculator — instant, no signup

Body: Calculate floor area from length and width, total multiple rooms, and convert to square metres. Try it: https://freetoolsgalaxy.com/tools/square-footage-calculator
LinkedIn post
Square Footage Calculator on Free Tools Galaxy — Calculate floor area from length and width, total multiple rooms, and convert to square metres. https://freetoolsgalaxy.com/tools/square-footage-calculator
Medium intro
# Square Footage Calculator — the free tool I keep coming back to

Calculate floor area from length and width, total multiple rooms, and convert to square metres.

Try it: https://freetoolsgalaxy.com/tools/square-footage-calculator
Quora answer
The fastest way is to use a free in-browser square footage calculator: https://freetoolsgalaxy.com/tools/square-footage-calculator. Calculate floor area from length and width, total multiple rooms, and convert to square metres.

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<iframe src="https://freetoolsgalaxy.com/tools/square-footage-calculator?embed=1" title="Square Footage Calculator" loading="lazy"
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<p><a href="https://freetoolsgalaxy.com/tools/square-footage-calculator" target="_blank" rel="noopener">Powered by Square Footage Calculator on Free Tools Galaxy</a></p>
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[Square Footage Calculator — free online tool](https://freetoolsgalaxy.com/tools/square-footage-calculator)

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Title
I built a free square footage calculator that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick square footage calculator and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard square footage use cases (square, footage, area, room) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/square-footage-calculator

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