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.
Excel includes two powerful iterative tools that can find roots for you by "guessing" until the equation equals zero.
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
If Goal Seek fails or you have constraints, use the Solver Add-in . You may need to enable it via File > Options > Add-ins . 2. Downloadable Solver Templates & Add-ins
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) A highly regarded resource among engineers
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.
For advanced users who need to solve hundreds of equations or find complex roots, downloading a pre-made template is the best route. If you have a set of data points
A user-friendly template designed specifically for cubic equations. It allows you to download a file where you simply enter your coefficients to get all three roots instantly.