Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Geometry
Circle Calculator
Calculate any circle property — area, circumference, diameter, or radius — by entering any one known measurement. Useful for geometry class, construction planning, or any task involving circular shapes.
Fill in the required fields to see your result.
Geometry
Ellipse Calculator
Calculate the area, perimeter, eccentricity, or focal distance of an ellipse from its semi-major and semi-minor axes. Useful in astronomy, engineering, and any field involving oval shapes.
Fill in the required fields to see your result.
Key differences
| Circle Calculator | Ellipse Calculator | |
|---|---|---|
| Category | Geometry | Geometry |
| Inputs required | 3 | 4 |
| Result | Result (units) | Result (units) |
| What it does | Calculate any circle property — area, circumference, diameter, or radius — by entering any one known measurement. Useful for geometry class, construction planning, or any task involving circular shapes. | Calculate the area, perimeter, eccentricity, or focal distance of an ellipse from its semi-major and semi-minor axes. Useful in astronomy, engineering, and any field involving oval shapes. |