Calculators
Square Calculator
Calculate square area, perimeter, and diagonal from a side length locally in your browser.
Enter a side length from 0 (exclusive) to 1000000000 to see the area (side x side), perimeter (4 x side), and diagonal (side x √2). The calculation runs locally in your browser; your value is not uploaded or stored.
Find square measurements without uploading anything.
Enter a side length from 0 (exclusive) to 1000000000 to see the area, perimeter, and diagonal. Everything runs locally in your browser, so your value is not uploaded or stored.
Frequently Asked Questions
Everything you need to know about this tool, how it works, and privacy.
What does the square calculator show?
Enter a side length from 0 (exclusive) to 1000000000. The calculator returns the area (side times side), the perimeter (4 times side), and the diagonal (side times the square root of 2). For example, a side of 5 gives area 25, perimeter 20, and diagonal about 7.07106781187.
Which formulas does the square calculator use?
It uses area = side x side, perimeter = 4 x side, and diagonal = side x square root of 2 from the Pythagorean theorem applied to the two equal sides.
Which inputs are accepted?
Enter a side length greater than zero through 1000000000. Decimal values are accepted. Zero, negative numbers, non-numeric text, and values above the limit show a clear error instead of a result.
Do my numbers stay private?
Yes. The calculation and copy action run locally in your browser. CodeASystem does not upload or store the value you enter.