Area & Perimeter Calculator

Area and perimeter of common 2D shapes.

Instant · runs in your browser
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About the Area & Perimeter Calculator

Pick a shape, such as a square, rectangle, triangle, circle, trapezium, parallelogram, rhombus or ellipse, enter its dimensions and get the area and perimeter with the formula used.

Common uses

  • Room and plot sizes
  • Material estimates for paint, tiles and fencing
  • Geometry homework

For land in marla or kanal, use the Land Area Converter afterwards.

How to use Area & Perimeter Calculator

  1. Enter your values. Units and defaults are shown beside each field.
  2. Press Calculate (results also update as you type once calculated).
  3. Read the result and the step-by-step breakdown with the formula used.
  4. Copy the result or reset to start again.

Frequently asked questions

How accurate is this calculator?

Calculations use the standard formulas shown on the page, computed in full precision and rounded only for display. The result is only as accurate as the inputs and assumptions listed.

Is it free?

Yes. All tools are free to use without an account.