wikiHow Ellipse Area Calculator The formula for calculating the area of an ellipse is: A = πab where "a" is the length of the semi-major axis and "b" is the length of the semi-minor axis. Here are the steps to calculate the area of an ellipse: 1. Measure the length of the semi-major axis (a). This is the longest distance from the center of the ellipse to the edge. 2. Measure the length of the semi-minor axis (b). This is the shortest distance from the center of the ellipse to the edge. 3. Square the value of a. 4. Square the value of b. 5. Multiply the values of a and b. 6. Multiply the result of step 5 by π. 7. The final result is the area of the ellipse. Here's an example to illustrate how this formula works: Let's say you have an ellipse with a semi-major axis of 6 units and a semi-minor axis of 4 units. a = 6 b = 4 a^2 = 36 b^2 = 16 a x b = 24 π x 24 = 75.4 So the area of the ellipse is approximately 75.4 square units. Page