Area Calculator

All tools

Calculate the area and perimeter of a rectangle, triangle, circle, trapezoid, parallelogram or ellipse. Pick a shape, enter the dimensions and get instant results. Free.

w h b h r a b h b h a b
Area – square units
Perimeter –
Enter dimensions in the same unit; area is in square units. The ellipse perimeter uses Ramanujan's approximation. Triangle perimeter needs all three side lengths.
Related Tools
Pythagorean Theorem Calculator

Solve any side of a right triangle from the other two using the Pythagorean theorem, plus its area, perimeter and the two non-right angles. Free and instant.
Circle Calculator

Enter any one of radius, diameter, circumference or area and instantly compute all the other circle properties. Free, accurate and easy to use.
Volume Calculator

Calculate the volume and surface area of a box, sphere, cylinder, cone, pyramid or capsule. Pick a shape, enter the dimensions and get instant results. Free.
Slope Calculator

Find the slope of a line through two points, plus the angle of incline, distance, midpoint, y-intercept and the line equation y = mx + b. Free and instant.
Distance Calculator

Find the distance between two points in 2D or 3D space, or the great-circle distance and bearing between two latitude/longitude coordinates.

Add this free tool to your own website — copy and paste the code below.