This ellipse reference table shows the area for a range of semi-major axis (a) values, assuming a semi-minor axis (b) of 3 units. Every figure is computed with the same engine that powers our Ellipse Calculator, so the numbers are exact.
| Semi-major axis (a) | Area | Circumference (approx.) |
|---|---|---|
| 1.3 units | 12.2522 | 14.0420 |
| 2.5 units | 23.5619 | 17.3145 |
| 3.8 units | 35.8142 | 21.4368 |
| 5 units | 47.1239 | 25.5270 |
| 7.5 units | 70.6858 | 34.5192 |
| 10 units | 94.2478 | 43.8567 |
| 15 units | 141.3717 | 63.0168 |
| 25 units | 235.6194 | 102.1094 |
| 35 units | 329.8672 | 141.5767 |
| 50 units | 471.2389 | 201.0289 |
How to use this table
Find the row closest to your semi-major axis (a) and read across to the area. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Ellipse Calculator for a precise answer.
Need a value that is not in the table? — the Ellipse Calculator does it instantly, for free, with the formula and a worked example built in.
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