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Area & Perimeter Calculator
Calculate area and perimeter of common shapes
Unit:
Area
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Circumference
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Related Tools
About This Calculator
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.
How to Use
- 1Select a shapeChoose from circle, triangle, rectangle, or other geometric shapes.
- 2Enter dimensionsInput the required measurements such as length, width, or radius.
- 3View resultsSee the calculated area and perimeter with formulas shown.
Frequently Asked Questions
Q. 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.
Q. 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.
Q. 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.
Q. 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).
Disclaimer: Results are for informational purposes only and do not constitute professional advice. Always consult qualified professionals for important decisions.