20 × 20 ft room in other units
A two-car garage bay or a large open-plan space is about this size. The area is length times width: 20 × 20 = 400 sq ft. Measure to the walls at the longest point, and add closets and alcoves you will floor.
| Unit | This room |
|---|---|
| Square feet | 400 sq ft |
| Square yards | 44.44 sq yd |
| Square meters | 37.16 sq m |
| Perimeter (around the walls) | 80 ft |
| Acres | 0.00918 acres |
What to buy for 400 sq ft
| Material | Amount |
|---|---|
| Flooring (10% waste, 20 sq ft boxes) | 440 sq ft, 22 boxes |
| Carpet (10% extra) | 48.9 sq yd |
| 12 × 12 in tiles (10% waste) | 440 tiles |
| Baseboard (perimeter, less doorways) | about 80 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 | 420 sq ft | 21 |
| 10% waste | 440 sq ft | 22 |
| 15% waste | 460 sq ft | 23 |
Use the square footage calculator for L-shaped rooms, circles and triangles, or the flooring calculator 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 20x20 room?
400 square feet (20 ft × 20 ft). That is 44.44 square yards or 37.16 square meters.
How many square feet of flooring do I need for a 20x20 room?
The floor is 400 sq ft, so buy about 440 sq ft with 10% for cuts and waste. That is 22 boxes at 20 sq ft a box.
How much carpet is a 20x20 room?
44.44 square yards of floor, so about 48.9 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.