Calculate the square footage of any space or area. Supports rectangles, circles, triangles, trapezoids, and L-shapes. Use it for rooms, yards, flooring, landscaping, painting, and any project where you need to know the area.
Estimates only — measure twice, calculate once.
Measuring a 12×14 foot room? That's 168 square feet, or about 18.7 square yards. For a 10-foot diameter circular patio, the area is 78.5 square feet. Knowing your exact square footage is the first step for ordering flooring, paint, carpet, tile, or any material sold by area.
| Room Size | Square Feet | Square Yards |
|---|---|---|
| 8×10 | 80 | 8.9 |
| 10×10 | 100 | 11.1 |
| 10×12 | 120 | 13.3 |
| 12×14 | 168 | 18.7 |
| 14×20 | 280 | 31.1 |
| 20×30 | 600 | 66.7 |
Multiply the length by the width in feet. A 10×12 room is 120 square feet. For circles, use the formula: π × radius². For triangles: ½ × base × height.
9 square feet per square yard. Divide your square footage by 9 to convert.
Break it into two rectangles. Measure each one separately, calculate the area of each, and add them together.
43,560 square feet per acre. A typical suburban lot of ¼ acre is about 10,890 square feet.
Measure the wall perimeter (add up all wall lengths), multiply by ceiling height, then subtract door and window openings. A standard door is about 21 square feet, a window about 15 square feet.
Typical Results
💡 Measure wall to wall at floor level. If the room isn't rectangular, measure longest and widest points.