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Area Calculator

Calculate area and perimeter for 10 shapes: square, rectangle, circle, triangle, trapezoid and more.

Shape

Side (s)

Height (h)

Parallel side b

Radius (r)

Semi-axis a

Semi-axis b

Base

Diagonal d₁

Diagonal d₂

Number of sides (n)

Central angle (°)

Area

Perimeter / Circumference

Formula:

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About Area Calculator

Our free Area Calculator helps you run quick, accurate calculations for everyday financial and mathematical needs with just a few inputs. Calculate area and perimeter for 10 shapes: square, rectangle, circle, triangle, trapezoid and more. Enter your values, and the calculator instantly shows detailed results with breakdowns you can understand. No signup, no ads interrupting your workflow — just accurate, reliable calculations you can trust. Works on any device, saves nothing to our servers.

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