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Ellipse Calculator

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Variable Legend

a= semi-major axis (longest radius)b= semi-minor axis (shortest radius)c= focal distance = √(a²−b²)e= eccentricity

Area

Product of semi-axes times π.

Perimeter (Ramanujan approximation)

No exact closed form — this approximation is very accurate.

Eccentricity

How elongated the ellipse is (0 = circle, 1 = parabola).

Focal distance

Distance from center to each focus.

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Pro Tip

Always verify your input values before calculating. For ellipse, small input errors can compound and significantly affect the final result.

Difficulty:Intermediate

Did you know?

Ellipse Calculator often looks simpler on the screen than on paper, but the calculator is really exposing a pattern that mathematicians have studied for decades or centuries.

Deep Dive

Read the full guide on how to use this calculator effectively

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Mathematically verified
Reviewed June 2026
Used 45K+ times
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