Irregular rooms
Break the floor into rectangles, run each one and add them. Treat a bay as a half circle. Measure at floor level, since walls are rarely square higher up.
Square footage calculator
Rooms, circles and borders — in sq ft, m², yd² and acres.
Frequently asked questions
How do I calculate square footage?
Multiply length by width in feet. A 14 × 12 ft room is 168 square feet. From inches, divide the result by 144.
How many square feet in a square metre?
10.764. To convert the other way, divide square feet by 10.764.
How do I measure an L-shaped room?
Split it into two rectangles at the inside corner, calculate each and add them.
How many square feet in an acre?
43,560 — roughly a 209 ft square.
How much extra to order
Flooring and tile get cut to fit: 10% over the measured area is standard, 15% for diagonal or herringbone layouts.
What this calculator assumes
- 1 m² = 10.7639 sq ft, 1 yd² = 9 sq ft, 1 acre = 43,560 sq ft.
- Measurements are finished dimensions, wall to wall.
- No waste is added — the right allowance depends on what you are buying.