Square Area Calculator

    Calculate square area from side length, diagonal, perimeter, known area, inradius, or circumradius, with reverse calculations for all related square measurements.

    Enter the side length. The calculator finds area and the related square measurements. Unit changes convert the entered value and the current result.

    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 valueWhat the calculator recovers
    SideArea, diagonal, perimeter, inradius, and circumradius.
    DiagonalSide first, then area and perimeter.
    PerimeterSide as one fourth of the perimeter, then area.
    Known areaSide as the square root of area.
    Inradius or circumradiusSide and diagonal from the circle radius.
    Area is shown in the square of the selected length unit. Unit changes convert area-mode input with a square coefficient.

    Frequently Asked Questions

    Sources and References

    Calculations are based on the listed reference sources. Links open in a new tab.

    Updated:

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