Ellipse Area Calculator
Calculate ellipse area from its two semi-axis lengths using πab.
How to use
- Enter semi-axis a.
- Enter semi-axis b and calculate.
Capabilities and scope
Inputs a and b are center-to-boundary semi-axes; the runner also shows full axes and identifies major/minor semi-axes.
How it works
It uses A=πab; the corresponding full axes are 2a and 2b.
Example
Semi-axes 5 and 3 give area 15π, about 47.1239.
Useful for
- Find the area of an elliptical panel or track
- Calculate area after halving known full axis lengths
Before you use it
- a and b must be semi-axis lengths, not the complete diameters.
Frequently asked questions
If the full width is 10, should I enter 10 for a?
No. A full axis of 10 corresponds to semi-axis a=5.