What is the Ellipse Area Calculator?
Calculate the area and approximate perimeter of an ellipse.
Enter semi-major axis and semi-minor axis and the Ellipse Area Calculator returns area and approximate perimeter. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Area = π × a × b
Perimeter uses Ramanujan's approximation
How to use it
- Enter semi-major axis.
- Enter semi-minor axis.
- Read area in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Ellipse Area Calculator use?
It uses: Area = π × a × b; Perimeter uses Ramanujan's approximation.
What do I need to use the Ellipse Area Calculator?
You need semi-major axis and semi-minor axis. Sensible starting values are filled in so you can see how it works straight away.
Is the Ellipse Area Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.