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Ellipse Calculator
Area, perimeter, eccentricity and foci of an ellipse from its semi-axes.
circle Free Online Tool
โก Instant Results
๐ Clear Comparison
๐ 100% Free Tool
Area
Compare Your Options And Get Clear Answers
Area, perimeter, eccentricity and foci of an ellipse from its semi-axes.
Ellipse Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: Area = pi a b.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Ellipse Quick Guide
Typical values for reference.
| a | b | Area | |
|---|---|---|---|
| 5 | 3 | 47.124 | |
| 10 | 2 | 62.832 | |
| 4 | 4 | 50.265 | |
| 0.5 | 0.3 | 0.471 | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Ellipse Calculator FAQ
Answers to common questions about this calculator.
A stretched circle defined by two foci.
Multiply pi by both semi-axes.
It is a very accurate approximation.
How stretched it is; 0 is a circle.