Square Footage Calculator
Calculate square footage for rooms, flooring, painting, and landscaping projects.
ft
ft
Total Area
180 sq ft
16.72 m² · 20 sq yd
How to Calculate Square Footage
Area = Length × Width
For rectangular spaces, simply multiply length by width. For irregular shapes, divide the area into rectangles, calculate each separately, then add the results.
Common Room Sizes
| Room Size | Square Feet | Square Meters |
|---|---|---|
| 10 × 10 | 100 | 9.29 |
| 12 × 12 | 144 | 13.38 |
| 12 × 15 | 180 | 16.72 |
| 15 × 20 | 300 | 27.87 |
| 20 × 20 | 400 | 37.16 |
Waste Factor Guide
| Material | Recommended Waste |
|---|---|
| Flooring (tile, hardwood) | 10–15% |
| Paint | 10% |
| Carpet | 5–10% |
| Wallpaper | 15–20% |
Frequently Asked Questions
How do I calculate square footage?
Multiply length by width. For a room that's 12 feet by 15 feet: 12 × 15 = 180 square feet. For irregular shapes, break the area into rectangles, calculate each, and add them together.
How many square feet is a 12x12 room?
A 12×12 room is 144 square feet (12 × 12 = 144). This is a common bedroom or living room size.
How do I calculate square footage for flooring?
Measure the length and width of each room, multiply to get square feet, then add 10% for waste and cuts. For 180 sq ft, order at least 198 sq ft of flooring.
How do I convert square feet to square meters?
Multiply square feet by 0.092903. For example, 200 sq ft × 0.092903 = 18.58 square meters. Or use our unit converter.
How do I measure a room with multiple areas?
Break the room into separate rectangles. Measure each section's length and width, calculate each area, then add them together. This calculator supports multiple areas.