Calculate the area and perimeter of squares, rectangles, circles, triangles, and trapezoids instantly.
Fill in the fields above and click calculate. All calculations run instantly in your browser — no data is sent anywhere.
Square, rectangle, circle, triangle, and trapezoid. Fields update dynamically based on your shape selection.
Any consistent unit — feet, meters, inches. Result is in the same unit squared. Use the Unit Converter to convert first if needed.
Using A = πr² where r is the radius. Circumference = 2πr.