About this tool
Paste the x,y coordinates of a polygon's vertices, one per line, and get its area via the shoelace formula plus its perimeter. The polygon may be any simple shape; computed live in your browser.
Frequently asked questions
What is the shoelace formula?
It computes a polygon's area from its vertex coordinates by summing cross products of consecutive points, then halving the absolute value. It works for any simple polygon.
Do I need to repeat the first point at the end?
No. The polygon is automatically closed by connecting the last vertex back to the first when computing both area and perimeter.