Ellipse Calculator

Area, perimeter (Ramanujan approximation), eccentricity, and foci.

Semi-major axis a

Semi-minor axis b

Semi-major (a)

Semi-minor (b)

Area

125.66

Perimeter (≈)

41.386

Eccentricity (e)

0.78062

Focal distance (c)

6.245

Red dots mark the two foci. Eccentricity: 0 = circle, closer to 1 = more elongated.