15 × 20 ft room in other units
A great room or a large open-plan living space is about this size. The area is length times width: 15 × 20 = 300 sq ft. Measure to the walls at the longest point, and add closets and alcoves you will floor.
| Unit | This room |
|---|---|
| Square feet | 300 sq ft |
| Square yards | 33.33 sq yd |
| Square meters | 27.87 sq m |
| Perimeter (around the walls) | 70 ft |
| Acres | 0.00689 acres |
What to buy for 300 sq ft
| Material | Amount |
|---|---|
| Flooring (10% waste, 20 sq ft boxes) | 330 sq ft, 17 boxes |
| Carpet (10% extra) | 36.7 sq yd |
| 12 × 12 in tiles (10% waste) | 330 tiles |
| Baseboard (perimeter, less doorways) | about 70 ft |
Flooring with different waste allowances
Straight layouts need about 5 to 7%, diagonal layouts 10%, and herringbone or patterns 15%.
| Waste | Flooring to buy | Boxes of 20 sq ft |
|---|---|---|
| 5% waste | 315 sq ft | 16 |
| 10% waste | 330 sq ft | 17 |
| 15% waste | 345 sq ft | 18 |
Use the square footage calculator for L-shaped rooms, circles and triangles, or the flooring calculator and flooring for a 15x20 room for a full flooring estimate.
Want to change anything else? The calculator above is the full Square Footage Calculator: edit any number and the results update instantly.
Tools & materials for this project
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Frequently asked questions
How many square feet is a 15x20 room?
300 square feet (15 ft × 20 ft). That is 33.33 square yards or 27.87 square meters.
How many square feet of flooring do I need for a 15x20 room?
The floor is 300 sq ft, so buy about 330 sq ft with 10% for cuts and waste. That is 17 boxes at 20 sq ft a box.
How much carpet is a 15x20 room?
33.33 square yards of floor, so about 36.7 sq yd with 10% extra for seams and fitting. Carpet is usually sold in 12 ft rolls, so ask the supplier how it will be cut.
Related sizes and guides
Related sizes
Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.