AnyCalc

Utility Tools

Area & Perimeter Calculator

Calculate area and perimeter of common shapes

Reviewed: AnyCalc Editorial|2026-07-19|Editorial policy|About

What this calculator does

The Area and Perimeter Calculator computes the area and perimeter of common geometric shapes including rectangles, circles, triangles, trapezoids, and more. Enter the dimensions of your shape and get instant numerical results. This tool is helpful for students doing geometry homework, homeowners calculating the square footage of a room, gardeners planning a garden bed, or anyone working on a DIY project that requires measuring space. It supports both metric and imperial units, so you can work in feet, meters, inches, or centimeters.

Unit:
Area
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Circumference
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How to use

  1. 01
    Select a shape
    Choose from circle, triangle, rectangle, or other geometric shapes.
  2. 02
    Enter dimensions
    Input the required measurements such as length, width, or radius.
  3. 03
    View results
    See the calculated area and perimeter with formulas shown.

Area & Perimeter Calculator FAQ

How do I calculate the area of a rectangle?▾
Multiply the length by the width. For example, a room that is 12 feet long and 10 feet wide has an area of 120 square feet. Enter the dimensions into the calculator for instant results.
What is the formula for the area of a circle?▾
The area of a circle equals pi times the radius squared (A = pi x r squared). Enter the radius or diameter into the calculator and it will do the math for you.
Can I use this to calculate the square footage of a room?▾
Yes. Select the rectangle shape, enter the room length and width in feet, and the calculator will show the area in square feet.
What is the difference between area and perimeter?▾
Area measures the space inside a shape (in square units), while perimeter measures the total distance around the outside of the shape (in linear units).

Interpret carefully

Outputs are decision-support estimates, not a substitute for professional judgment.

  • Treating Area & Perimeter Calculator output as a final professional diagnosis, quote, or legal determination
  • Entering approximate values when the result is sensitive to units or precision
  • Applying the FAQ answer (“How do I calculate the area of a rectangle?”) to a special case without checking assumptions

Next steps

  1. Double-check inputs against your source documents (labs, statements, specs, or notes).
  2. Confirm the method below matches your use case before you act on the number.
  3. For medical, financial, or production decisions, verify with a qualified professional.

Disclaimer: Results are informational only and do not constitute medical, financial, legal, or professional advice. Report issues: sublimernj@gmail.com

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