Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Geometry
Circle Area Calculator
Calculates the area enclosed by a circle from its radius using A = π·r². Ideal for geometry homework, landscaping projects, or sizing circular spaces like pools, garden beds, or pipe cross-sections.
Fill in the required fields to see your result.
Geometry
Ellipse Area and Circumference Calculator
Calculate the area, circumference (perimeter), eccentricity, and focal distance of an ellipse using its semi-major and semi-minor axes. Essential for astronomy, engineering, and analytic geometry.
Fill in the required fields to see your result.
Key differences
| Circle Area Calculator | Ellipse Area and Circumference Calculator | |
|---|---|---|
| Category | Geometry | Geometry |
| Inputs required | 1 | 4 |
| Result | Circle Area (square units) | Result (units²/units) |
| What it does | Calculates the area enclosed by a circle from its radius using A = π·r². Ideal for geometry homework, landscaping projects, or sizing circular spaces like pools, garden beds, or pipe cross-sections. | Calculate the area, circumference (perimeter), eccentricity, and focal distance of an ellipse using its semi-major and semi-minor axes. Essential for astronomy, engineering, and analytic geometry. |