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THE FEUTEX TOOLKIT

Ellipse Foci and Eccentricity

Find an ellipse’s focal offset, eccentricity and latus rectum from its major and minor semi-axes.

Geometry workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaFocus Distance = sqrt(a**2-b**2); Eccentricity = sqrt(1-b**2/a**2); Latus Rectum = 2*b**2/a
Sources and model references

How to use this tool

  1. Enter the labeled inputs using consistent units.
  2. Check the stated assumptions and calculate.
  3. Review each output and compare another input scenario.

Try this example

{
  "a": 5,
  "b": 3
}

Accuracy and scope

Finite floating-point arithmetic; results can lose precision near singular or extreme inputs.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.