Ellipse Calculator
Find an ellipse's area, exact perimeter, eccentricity and foci from its two semi-axes.
Area
47.1238898
- Perimeter (circumference)
- 25.52699886
- Eccentricity
- 0.8
- Distance from center to each focus
- 4
Show the work
Area: π × the two semi-axes
A = π × a × b
π × 5 × 3 = 47.1238898
How it works
Area = πab; perimeter = 4a E(e) computed exactly with the arithmetic–geometric mean; e = √(1 − b² ÷ a²); focal distance = √(a² − b²)
Questions
- How does the ellipse calculator work?
- Area = πab; perimeter = 4a E(e) computed exactly with the arithmetic–geometric mean; e = √(1 − b² ÷ a²); focal distance = √(a² − b²).
- What do I need to enter?
- Semi-major axis (a), Semi-minor axis (b), Units. Optional fields can be left blank.
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