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CALCULATOR

Rectangular Layout Diagonal Calculator

Calculates the expected diagonal of a rectangular layout from its length and width. Compare this result with measured diagonals to assess whether the layout is square.

YOUR INPUTS Live calculation

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Expected Diagonal Measurement

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Expected Diagonal MeasurementEnter inputs
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How the calculation works

Expected diagonal D = sqrt(length^2 + width^2), with each input converted from its independently selected length unit to the canonical length unit before evaluation.

Worked example

With length 30 ft, width 40 ft, expected diagonal measurement is 50 ft.

Assumptions and limits

Length and width are nonnegative side lengths of a flat two-dimensional rectangle. The calculator returns the expected diagonal only. It does not accept a measured diagonal, compare the two diagonals, or determine whether the layout is square. Numeric bounds are the registered V5 runtime limits, not limits stated by the source.

Method sources

Related shape tools

This tool uses both rectangle sides. For a square with one side, use the square diagonal calculator. For the full boundary from perpendicular legs, use right triangle perimeter.