Geometry & Measurement Calculators
Square Diagonal Calculator
Find the diagonal of a square from its side length.
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What is Square Diagonal?
A square's diagonal is its side times √2. The diagonal splits the square into two 45-45-90 right triangles, which is why the ratio is fixed for every square.
How it works
We multiply the side by √2 for the diagonal, and report the area and perimeter from the same side length.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.