Overview
Stop doing cut math twice.
This started because the mistakes were never the geometry. The mistakes were the rhythm of the shop. You get interrupted, you switch from inside to outside without noticing, somebody eyeballs kerf, and the same stick gets re-measured three times because nobody trusts the number on the paper.
This calculator is built around the inputs we actually use: stock length, allowance, and a list of cuts. The point is not fancy math. The point is a repeatable saw plan that stays consistent from the first part to the last.
If it takes longer than a notepad, it is not a tool. This stays fast. Punch it in, get the plan, move on.
If the number feels shaky, it is already costing you time. This keeps it steady.