Frequently Asked Questions
Should I enter semi-axes or full diameters?
Enter the semi-axes, the distances from the center to the edge. The full width and height are twice these values.
How is the circumference calculated?
An ellipse has no simple exact perimeter, so the calculator uses the Ramanujan approximation, which is accurate to a tiny fraction of a percent.
What does eccentricity mean?
Eccentricity ranges from zero for a circle toward one for a long, thin ellipse, measuring how stretched the shape is.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.