Geometry Calculator - Calculate Area & Perimeter

Choose a shape to calculate its area, perimeter, or volume.

Rectangle Dimensions

Circle Dimensions

Triangle Dimensions

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Understanding Geometric Calculations

Our geometry calculator helps you quickly compute important measurements for basic shapes:

Rectangle Formulas

  • Area = length × width
  • Perimeter = 2(length + width)

Circle Formulas

  • Area = Ï€r²
  • Circumference = 2Ï€r

Triangle Formulas

  • Area = ½ × base × height
  • Perimeter = side1 + side2 + side3