Ellipse Calculator
Calculate ellipse area, perimeter, and eccentricity from semi-major and semi-minor axes.
Inputs
units
units
Results
Area
47.12
Perimeter25.53
Eccentricity0.8
Area
47.12
How to Use This Calculator
- Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
- Semi-Major Axis (a) — Length of the semi-major axis. Accepts values from 0.1 units to 10,000 units (default: 5 units).
- Semi-Minor Axis (b) — Length of the semi-minor axis. Accepts values from 0.1 units to 10,000 units (default: 3 units).
- Once all inputs are set, review your results in the Results panel. Here's what each output means:
- Area — shown as a numeric value. This is the primary result of this calculator.
- Perimeter — shown as a numeric value.
- Eccentricity — shown as a numeric value.
- Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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Formula
Area = πab, Perimeter ≈ π(3(a+b) - √((3a+b)(a+3b)))Related Calculators
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Calculate the area and perimeter of common shapes — rectangle, circle, triangle, trapezoid, and ellipse.
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Calculate the perimeter of rectangles, circles (circumference), triangles, and regular polygons with any number of sides.
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