Best for finding one real root at a time. Enter a "guess" value in cell A1 . In cell B1 , enter your cubic formula using A1 as your , e.g., =A*A1^3 + B*A1^2 + C*A1 + D . Go to the Data tab > What-If Analysis > Goal Seek . Set Cell B1 to Value: 0 by changing Cell A1 . Click OK.
A highly regarded resource among engineers. You can download the Polynomial.zip file, which includes VBA functions like SolvePoly to return all solutions—including imaginary ones—directly in your sheet.
If you have a set of data points and want to find the cubic equation that fits them: Solving Cubic Equations by Excel - Pearson cubic equation solver excel download
Excel includes two powerful iterative tools that can find roots for you by "guessing" until the equation equals zero.
If you prefer not to download files, you can program Cardano’s method yourself. This method involves finding the ( Δcap delta ) to determine the nature of the roots: : Three distinct real roots. : Real roots, some of which are multiple. : One real root and two complex conjugate roots. Best for finding one real root at a time
For advanced users who need to solve hundreds of equations or find complex roots, downloading a pre-made template is the best route.
Solving a cubic equation like in Excel is not a native "one-click" feature, but there are several robust ways to handle it, ranging from built-in tools to downloadable templates. Depending on whether you need a quick single answer or all three possible roots (real and complex), here is the ultimate guide to cubic equation solvers in Excel. 1. Built-in Excel "Solvers" (No Download Required) Go to the Data tab > What-If Analysis > Goal Seek
This site offers a free .xls download that utilizes Cardano's method to solve cubic equations with high precision. 3. Solving with the Cubic Formula (Manual Implementation)