Tool: Surface Divide
In Grasshopper, you can use domain components to divide your surface. Yet, because of the nature of surfaces in Rhino(It is my guess), there is no component that divides a surface for you by measure. Sure you can divide a U and V into segments, but there is no component to divide a surface based on the width and length of panels.
For my convenience, I have created a Python component for doing the planar division in Grasshopper. It would be super If you used it and let me know about your experience.
Also, I am developing a plugin for my daily designing workflow in which this feature is as well.
You can download the .gh definition for free on Gumroad linked here.