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Rectangle Diagonal Calculator

Get a rectangle's diagonal in one step

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator uses the Pythagorean theorem, d = √(w² + h²), treating a rectangle's diagonal as the hypotenuse of the right triangle formed by its width and height. Because a rectangle's two diagonals are always equal in length, this single calculation gives you both.

Carpenters and framers use it to "square" a rectangular layout — a frame or foundation is truly square only if its two diagonals measure exactly the same — while designers, screen manufacturers and packagers use the same formula to compute display sizes, box dimensions and cut-to-fit panels from just a width and height.

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