Square Footage Calculator
Calculate square footage for rooms, floors and land: rectangles, circles and triangles, several areas at once, in feet or metres, with cost. Free.
- Square metres
- 16.72 m²
- Square yards
- 20 yd²
- Acres
- 0.0041
Measure any space
For a rectangular room, multiply length by width: 12 ft × 15 ft is 180 sq ft. Irregular spaces like L-shaped rooms are easiest split into rectangles, each added as its own area; the total sums them. Circles and triangles are included for bay windows, round patios and gables. Enter a price per square foot to estimate the cost of flooring, carpet, tiles or paint coverage, and see the total in square metres, square yards and acres too.
How to use it
- 1
Measure each area
Measure the length and width in feet or metres, wall to wall.
- 2
Add each part
Split L-shapes into rectangles and add each one.
- 3
Add a price (optional)
To estimate the cost of flooring or materials.
Frequently asked questions
How do I calculate square footage of an L-shaped room?
Split it into two rectangles, work out each one's area and add them. Add each rectangle as its own area here.
How much flooring should I buy?
Add 5–10% for cuts and waste, or 15% for diagonal layouts and patterned tiles.
How do I convert square feet to square metres?
Divide by 10.764. 180 sq ft is 16.7 m².
Is anything sent to a server?
No. Everything is calculated in your browser, and nothing you type is stored or sent anywhere.