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Mathematics

Ellipse Perimeter Calculator

Variable Legend

a= semi-major axisb= semi-minor axish= h = (a−b)²/(a+b)²

Ramanujan approximation

Accurate to within 0.0002% for typical ellipses.

h parameter

Intermediate value used in the approximation.

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Pro Tip

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

Difficulty:Advanced

Did you know?

The mathematical principles behind ellipse perimeter calc have practical applications across multiple industries and have been refined through decades of real-world use.

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Reviewed May 2026
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