Square Area Calculator
Calculate square area from side length, diagonal, perimeter, known area, inradius, or circumradius, with reverse calculations for all related square measurements.
Square area from side, diagonal, or perimeter
English search intent for a square area calculator is direct: enter a side length and get area. This page also supports common reverse inputs such as diagonal, perimeter, known area, inradius, and circumradius.
A is square area; s is side length.
d is the square diagonal.
P is square perimeter.
Supported inputs
| Known value | What the calculator recovers |
|---|---|
| Side | Area, diagonal, perimeter, inradius, and circumradius. |
| Diagonal | Side first, then area and perimeter. |
| Perimeter | Side as one fourth of the perimeter, then area. |
| Known area | Side as the square root of area. |
| Inradius or circumradius | Side and diagonal from the circle radius. |
Frequently Asked Questions
Sources and References
Calculations are based on the listed reference sources. Links open in a new tab.
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