About the Polynomial Root Finder
A tool for finding every real and complex root of a polynomial equation.
What it is
The Polynomial Root Finder takes a polynomial's coefficients and computes all of its roots โ real and complex โ using the Durand-Kerner iterative method, which refines every root estimate simultaneously rather than finding and removing one root at a time. Results are displayed as a labeled list alongside a graph highlighting where the curve crosses the x-axis.
Features
Any degree up to 8
Handles quadratics, cubics, quartics, and higher-degree polynomials.
Real and complex roots
Every root is found and labeled, including conjugate complex pairs.
Live graph
Real roots are plotted where the polynomial curve crosses the x-axis.
Quick examples
One-click sample polynomials to see how the tool works.