NumberCals

Square Area Calculator

Calculate area, perimeter, and diagonal of a square from its side length.

About this calculator

The Square Area Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to calculate area, perimeter, and diagonal of a square from its side length. Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.

Formula used

A = s²; P = 4s; d = s√2

What you'll need

  • Side Length (e.g. 5)

What you'll get

  • Area
  • Perimeter
  • Diagonal
Formula
A = s²; P = 4s; d = s√2

Frequently Asked Questions

How is a square different from a rectangle? +

A square is a rectangle where all four sides are equal length. Every square is a rectangle, but not every rectangle is a square.

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