Ellipse area
Geometry / FREE CALCULATOR
Find an ellipse's area from its two semi-axes.
Your answer starts here.
Enter your values and select Calculate to see the result and any available breakdown.
How to use this calculator
- Enter semi-major axis. Use the unit shown beside the field.
- Enter semi-minor axis. Use the unit shown beside the field.
- Select Calculate and review the result. Select Reset to restore the example inputs.
How the calculation works
3.141592653589793*Semi-major axis*Semi-minor axis
Worked example
Semi-major axis = 5; Semi-minor axis = 3. Result: 47.1239 square units.
Understand your result
Find an ellipse's area from its two semi-axes. The result is expressed in square units.
Assumptions and limitations
Enter half-axis lengths, not full width and height. Results are rounded for display.
Questions about this tool
What does this tool calculate?
Find an ellipse's area from its two semi-axes.
What should I check before using the answer?
Enter half-axis lengths, not full width and height.
Related guides
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