What is the formula for the area of a circle?

Area = π × r² (radius squared times pi). For a circle with radius 5: Area = 3.14159 × 25 = 78.54 square units.

How do I find the area of an irregular shape?

Break it into regular shapes (rectangles, triangles, etc.), calculate each area separately, then add them together.

Area Calculator

Select a shape and enter dimensions to calculate area and perimeter.

Calculate the area and perimeter of any common 2D shape: square, rectangle, circle, triangle, or trapezoid. Enter the required dimensions and get the exact area with the formula used.

Last reviewed: April 2026Report an error

Length

Width

Area

50 sq units

Area: 50 sq units. Perimeter: 30 units.

Area

square units

Perimeter

units

How to Use This Area Calculator

Select the shape (square, rectangle, circle, triangle, or trapezoid).
Enter the required dimensions for that shape.
Read the area, perimeter, and formula used.

Frequently Asked Questions

: Area = π × r² (radius squared times pi). For a circle with radius 5: Area = 3.14159 × 25 = 78.54 square units.
: Break it into regular shapes (rectangles, triangles, etc.), calculate each area separately, then add them together.

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Area Calculator

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