Free tool
Build a target where every small square is one click on your optic. Count squares, turn that many clicks. Works at your real zero distance — or as an offset target when your range is shorter than the zero you want.
Every square is sized to your optic's clicks, so scaling the page breaks the math. The sheet has a 5-inch ruler bar; measure it before you trust the grid.
If you shoot closer than your zero distance, the bullet hasn't risen to your line of sight yet, so a correct zero prints low at the near distance. This tool marks where your group should land. Two things to know before you rely on it:
Offset targets are a workaround for short ranges, not a replacement for confirming your zero at the distance you chose. The course covers the whole process, including the confirmation step.