Question 1

How do I calculate the area of a shape?

Accepted Answer

Pick a shape from the list, enter the required measurements (lengths in the same unit), and the result is shown instantly. The formula and a labeled diagram are displayed so you can double-check the inputs.

Question 2

What units does this calculator use?

Accepted Answer

Results are shown in square units of whatever you type. Enter length in meters, and area will be in m²; enter in feet, and area is in ft². Pick a preset unit (mm, cm, m, km, in, ft, yd, mi) to see the result in that unit's square form too.

Question 3

What shapes are supported?

Accepted Answer

Square, rectangle, triangle, right triangle, circle, ellipse, trapezoid (trapezium), parallelogram, sector, regular polygon (pentagon through dodecagon), rhombus, and annulus (ring). Each shows a visual diagram and the formula used.

Question 4

Is this calculator private?

Accepted Answer

Yes. All calculations run in your browser with JavaScript. No inputs are sent to a server, no cookies are set, and no sign-up is required.