Calculate the area of rooms, walls, and spaces for flooring, painting, and more.
Result
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Area
Perimeter-
⚙️ How It Works
A square footage calculator computes the area of a space by multiplying length by width for rectangular rooms. For irregular spaces, divide them into rectangles, calculate each area, and sum them. Square footage is used in real estate listings, flooring estimates, paint calculations, and rental pricing.
Rectangle: Area = Length × Width | Triangle: Area = 0.5 × Base × Height | Circle: Area = π × radius² | 1 sq ft = 0.0929 m² | 1 m² = 10.764 sq ft
Editorial Standards
Author
BetterProduct Editorial Team
Reviewed by
Checked against standard math or conversion logic and browser-side calculation behavior.
Updated
March 2026
Best used for
Quick everyday calculations and unit checks.
Languages checked
7 language editions aligned from the same source formulas.
Use Results Responsibly
Check units and formats before you calculate.
Round only at the end if precision matters.
Use official records for deadlines, utility rates, or school policies when applicable.
❓ FAQ
How do I measure square footage of a room?
Measure the length and width of the room in feet using a tape measure, then multiply them. For an L-shaped room, divide it into two rectangles, calculate each area, and add them together. Include closets if measuring total living space.
How much paint do I need for a room?
One gallon of paint typically covers 350–400 square feet with one coat. Calculate wall area: (perimeter × ceiling height) − (doors × 20 sq ft) − (windows × 15 sq ft). Add 10% for waste and plan for two coats for full coverage.
How is square footage used in real estate?
Real estate listings use square footage to describe living space. It typically includes all finished, heated areas but excludes garages, unfinished basements, and outdoor spaces. Measurement methods vary, so always verify with official records.
How do I convert square feet to square meters?
Multiply square feet by 0.0929 to get square meters. Or divide by 10.764. Example: 1,000 sq ft × 0.0929 = 92.9 m². To convert m² to sq ft, multiply by 10.764.