Area of a Square Calculator

Summary

Enter a side length to get the area, perimeter, and diagonal of a square — or enter the area to find the side.

How it works

1. Choose whether to start from the side length or the area.
2. Enter your known value in the input field.
3. The calculator instantly computes all remaining properties.
4. Read off area, perimeter, and diagonal with the formula breakdown shown.
5. Click "Copy Results" to copy all values to your clipboard.

Use cases

• Calculate floor or land area for square-shaped spaces.
• Find the perimeter of a square room or garden plot.
• Determine how long the diagonal of a square tile or panel is.
• Work backwards from a known area to find the required side length.
• Verify geometry homework answers instantly.
• Use in construction, carpentry, or landscaping measurements.
• Convert square footage or square meters to a side length.
• Explore how area and perimeter scale with side length.

Frequently Asked Questions