Diagonal of a Square Calculator: Find Length from Side

Calculate the Diagonal Length of Your Square

Quickly determine the diagonal length of any square given its side. This free online tool is perfect for geometry problems, construction planning, and design projects, providing instant, accurate results using the Pythagorean theorem.

Formula:

The formula to calculate the diagonal (d) of a square given its side length (s) is:

d = s√2

Where:

  • d = Diagonal of the square
  • s = Side length of the square
  • √2 ā‰ˆ 1.41421356

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