Foci of Ellipse Calculator


Calculating the foci of an ellipse is a crucial task in geometry, often required in various mathematical and engineering applications. To simplify this process, we present a user-friendly Foci of Ellipse Calculator implemented in HTML and JavaScript. This tool allows users to input the necessary parameters and obtain accurate results effortlessly.

How to Use

To use the Foci of Ellipse Calculator, follow these simple steps:

  1. Input the values of semi-major axis (a) and semi-minor axis (b).
  2. Click the “Calculate” button.
  3. View the calculated foci of the ellipse.


The formula for calculating the foci of an ellipse is given by:


  • c is the distance from the center to each focus,
  • a is the length of the semi-major axis,
  • b is the length of the semi-minor axis.


Suppose we have an ellipse with a semi-major axis (a) of 5 units and a semi-minor axis (b) of 3 units. Applying the formula:

Thus, the foci of the ellipse are located 4 units away from the center along the major axis.


Q: Can I use decimals or fractions for the axes?

A: Yes, the calculator supports decimal and fractional inputs for both the semi-major and semi-minor axes.

Q: Is there any limit on the size of the ellipse I can calculate?

A: The calculator can handle ellipses of various sizes, including very large or very small ones.

Q: What if my ellipse is a circle (a=b)?

A: If the semi-major axis is equal to the semi-minor axis, the foci coincide with the center, resulting in a single point.


The Foci of Ellipse Calculator provides a convenient and efficient way to determine the foci of an ellipse. Whether you’re a student studying geometry or a professional dealing with geometric calculations, this tool streamlines the process, ensuring accurate results every time.


  • Raees Mughal

    Meet Raees Mughal, a seasoned SEO author whose expertise lies at the intersection of compelling content and search engine optimization. With a passion for crafting engaging narratives and a keen understanding of the ever-evolving SEO landscape, Raees brings a unique blend of creativity and technical proficiency to the world of digital content. Raees Mughal has a proven track record of helping businesses enhance their online visibility and reach through strategic SEO-driven content. Whether it's creating keyword-rich articles, optimizing website copy, or developing content marketing strategies, Raees leverages his in-depth knowledge of SEO best practices to drive organic traffic and improve search engine rankings.

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