How Many Square Feet Is 20x20?
An area of 20x20 feet is 400 square feet (20 × 20). That is 44.4 square yards, 37.2 square meters or 0.009 acres, about the same area as a two-car garage (20 x 20 ft).
20x20 feet in other units
| Measure | Value |
|---|---|
| Square feet | 400 sq ft |
| Square yards | 44.4 sq yd |
| Square meters | 37.2 sq m |
| Acres | 0.009 acres |
| Perimeter | 80 ft |
| Diagonal (corner to corner) | 28.3 ft |
Square feet = length × width = 20 × 20 = 400. Square yards = sq ft ÷ 9, square meters = sq ft × 0.0929, acres = sq ft ÷ 43,560. About 108 areas of 20x20 ft fit in one acre.
Materials for 400 square feet
| Project | Amount |
|---|---|
| Flooring or tile, with 10% extra for cuts | 440 sq ft |
| Mulch, 3 inches deep | 3.7 cu yd |
| Gravel, 4 inches deep | 4.94 cu yd (about 6.91 tons) |
| Concrete slab, 4 inches thick | 4.94 cu yd |
Volumes are before any extra for settling or spillage. Use the tile calculator, gravel calculator or concrete calculator for the exact order, with extra and cost.
Not a perfect rectangle?
Measure an L-shaped room, a triangular corner or a lot with a diagonal side with the square footage calculator. It works in feet, inches, yards or meters, and subtracts closets, stairs or any area you do not want to count. For painting, the wall area matters more than the floor: see the paint calculator.
Frequently asked questions
How many square feet is a 20x20 room?
A 20x20 ft room is 400 square feet. Multiply the length by the width: 20 × 20 = 400 sq ft.
How many square yards is 20x20 feet?
400 square feet is 44.4 square yards. A square yard is 3 ft × 3 ft = 9 square feet, so divide the square feet by 9.
How many square meters is 20x20 feet?
400 square feet is 37.2 square meters. Multiply the square feet by 0.0929 (1 ft = 0.3048 m, so 1 sq ft = 0.09290304 sq m).
How many acres is 20x20 feet?
400 square feet is 0.009 acres. An acre is 43,560 square feet, so about 108 areas of 20x20 ft fit in one acre.
How do I find the square footage of an L-shaped or irregular space?
Split the space into rectangles, multiply length by width for each one and add the results. The square footage calculator does this for L-shapes, triangles, circles and lots with a diagonal, and subtracts areas you do not need.
Other sizes
Figures are for a rectangle measured in feet. Real rooms have walls with thickness and lots have boundaries, so measure the actual space.