Can I mix rectangles with a triangle or circle in one total?

Not automatically — switching shape mode replaces the calculation. Note each shape's area separately and add them yourself for an irregular room made of multiple shapes.

Which unit should I use?

Whichever matches your tape measure or floor plan — the toggle converts your input, and the total is always shown in both sq ft and m² regardless.

How accurate is the sq ft ⇄ sq m conversion?

Exact: 1 square meter = 10.76391 square feet, a fixed unit-conversion constant, not an estimate.

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Math & Everyday

Square Footage Calculator

Area for rooms, triangles, or circles — with a live sq ft ⇄ sq m conversion.

🔒 Runs entirely in your browser — nothing here is ever uploaded

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About the Square Footage Calculator

Calculates square footage for rectangular rooms (add as many as you like and they'll be summed), a triangle, or a circle — with the total always shown in both square feet and square meters.

100% Free Runs in Your Browser No Sign-Up Required

How to use it

Pick a shape: one or more rectangular rooms, a triangle, or a circle.
Enter the dimensions — length/width per room, or base/height, or radius.
Read the total area in both sq ft and m², regardless of which unit you entered in.

Formula

Rectangle: length × width, summed across every room added. Triangle: ½ × base × height. Circle: π × radius². 1 sq m = 10.76391 sq ft.

Worked example

Two rooms, 12ft × 10ft and 8ft × 8ft: 120 + 64 = 184 sq ft (17.10 m²) total.

Recommendations

• Measure interior wall-to-wall dimensions for the closest match to how real estate listings typically report square footage — this tool doesn't subtract wall thickness or closets.
• Add a room for every rectangular space you want included, then switch to Triangle or Circle mode separately for an odd-shaped room, adding its area to your running total by hand.
• Switching the unit toggle converts your input, not just the display — enter meters directly in metric mode rather than converting ft to m yourself first.

Frequently asked questions

No — it's pure geometry (length × width, or the triangle/circle formula). Real listed square footage sometimes differs based on measurement convention (interior vs. exterior walls).