Two semiaxes times pi
Ellipse area calculator
Enter the semi-major and semi-minor axes, not the full diameters.
Formula and worked example
How to calculate the area of an ellipse
Area (A) = π × semi-major axis (a) × semi-minor axis (b).
For a = 6 m and b = 4 m: A = π × 6 × 4 = 24π m² ≈ 75.398223686155 m².
If you have the full width and height
Divide each full axis by two first. A 12 m × 8 m ellipse has semiaxes 6 m and 4 m, so its area is 24π m².
For a semi-ellipse
A semi-ellipse with the same semiaxes has half the full area: 24π ÷ 2 = 12π m².
This formula applies to a geometric ellipse. An arbitrary curve described as an oval may not be an ellipse and can require different measurements.
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