| Area |
Difference from 500 sq ft |
| 500 sq ft |
Reference area |
| 700 sq ft |
200 sq ft more; 40% larger |
| 1,000 sq ft |
500 sq ft more; twice the area |
See 700 square feet visualized and 1,000-square-foot dimensions for the next comparisons.
Twice the area does not mean twice every side length. Doubling both sides of a 20 × 25-foot rectangle creates a 40 × 50-foot rectangle containing 2,000 square feet—four times the original area.
To double the area while keeping a rectangle's proportions, multiply each side by √2, approximately 1.414.
For a smaller-room reference, 200 square feet is 40% of a 500-square-foot area. A 10-by-20-foot rectangle is one way to picture it.
For an intermediate reference, 300 square feet is 60% of a 500-square-foot area. A 15-by-20-foot rectangle is one way to picture it.
What does 400 square feet look like?
400 square feet is the area of a 20 × 20-foot square, equivalent to 37.161216 square meters, or about 37.16 m². It is 80% of a 500-square-foot area.
| Length × width |
Area |
| 20 × 20 ft |
400 sq ft |
| 16 × 25 ft |
400 sq ft |
| 10 × 40 ft |
400 sq ft |
For a rectangle, multiply length by width. If one side is known, divide 400 by that side to find the other. A 16-foot width gives a 25-foot length.
20 feet
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20 ft | 400 sq ft |
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Labeled schematic, not a scale drawing or floor plan.
To compare it with the 20 × 25-foot example on this page, remove a 20 × 5-foot band. The removed band is 100 square feet, leaving a 20 × 20-foot square containing 400 square feet.
A 500-square-foot space has 25% more area than a 400-square-foot space; conversely, 400 square feet is 20% less than 500. The percentages differ because the starting areas differ.
These dimensions describe area, not a guaranteed furniture layout. A 10 × 40-foot room has the same total area as the square but very different proportions. Measure the actual space and include doors, fixed features and furniture access.