Area of an Ellipse Calculator
⬛ Area & perimeter (2D). Use the Area of an ellipse formula to find area, semi-major axis a, semi-minor axis b: pick the value you want, type the others, and the answer updates as you go.
Area37.699 cm²
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Area | cm² |
| Semi-major axis a | cm |
| Semi-minor axis b | cm |
Worked example
Find the area when Semi-major axis a = 4 cm, Semi-minor axis b = 3 cm.
Using A = π a b: Area = 37.699 cm².
Frequently asked questions
What is the formula for Area of an ellipse?
A = π a b.
What do the letters stand for, and what units are used?
Area in cm², Semi-major axis a in cm, Semi-minor axis b in cm.
How do you calculate area?
Put the values into A = π a b. For example, with Semi-major axis a = 4 cm, Semi-minor axis b = 3 cm, area = 37.699 cm².
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (area, semi-major axis a, semi-minor axis b) and fill in the others: it rearranges the formula for you.
