±Free
Ellipse measurements
Calculate ellipse area and Ramanujan’s approximate perimeter from semiaxes.
Enter the two positive semiaxes, each measured from the center to the boundary. The tool returns πab for area, eccentricity from the semiaxis ratio and Ramanujan’s perimeter approximation.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
First semiaxis: 2 Second semiaxis: 2
Example result
{
"area": 12.5663706144,
"approximatePerimeter": 12.5663706144,
"eccentricity": 0
}Limitations and details
Enter semiaxes rather than full width and height; the perimeter is an approximation, especially for very elongated ellipses.
Inputs and options
- First semiaxis
- Number
- Second semiaxis
- Number
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.