Ellipse Area and Circumference Calculator
Calculate area, circumference, and eccentricity of ellipses with semi-major and semi-minor axes
About this calculator
The Ellipse Area and Circumference Calculator is a powerful tool that computes essential ellipse measurements using the semi-major and semi-minor axes as inputs. This calculator instantly determines the area, circumference (perimeter), and eccentricity of any ellipse, making it invaluable for students, engineers, architects, and professionals working with geometric calculations. Whether you're solving geometry problems, designing oval structures, or analyzing orbital mechanics, this tool provides accurate results for all your elliptical calculations.
How to use
Enter the length of the semi-major axis (the longer radius from center to edge) and the semi-minor axis (the shorter radius) in your preferred units. Click calculate to instantly get the ellipse's area, circumference, and eccentricity. The results will show precise values for all three measurements simultaneously.
Frequently asked questions
What is the difference between semi-major and semi-minor axes?
The semi-major axis is the longest radius from the center to the ellipse edge, while the semi-minor axis is the shortest radius perpendicular to it.
What does eccentricity tell us about an ellipse?
Eccentricity measures how stretched an ellipse is. Values closer to 0 indicate a more circular shape, while values closer to 1 indicate greater elongation.
Can I use this calculator for circles?
Yes! When the semi-major and semi-minor axes are equal, the ellipse becomes a circle, and the calculator will provide accurate circular measurements.