Calculate the area of rectangles, triangles, circles, trapezoids, and more.
Rectangle: area = length × width; triangle: ½ × base × height; circle: π × radius².
A rectangle 8 m by 5 m has an area of 40 m²; a circle of radius 3 has an area of about 28.3 m².
Rectangles, squares, triangles, circles, trapezoids, parallelograms, and ellipses.
It uses the units you enter; area is in those units squared.
Some versions convert between square feet, square meters, and other common area units.