Your fabricator builds your board on a standard production panel, commonly 18 x 24 inches. How many of your boards fit on that panel feels fixed, but it is not. It is the result of a handful of choices you still control, and any panel space your boards do not fill is area you still pay to process on every panel you build. This page covers the levers that raise boards per panel, and how to find the best combination before the design is locked.
Five things decide how many boards fit on a panel, and you can move all of them.
Rotation. Allowing a board to rotate 90 degrees often raises boards per panel. There is a tradeoff: PCB laminate has a grain direction, and rotated boards have a different grain orientation, which can introduce dimensional variation. So rotation is a lever to test, not a free win.
Spacing and borders. The spacing between boards and the border areas your fabricator reserves for tooling reduce the space left for boards. Setting them to your fab's real minimums, rather than a cautious guess, leaves room to fit more.
The array. Smaller boards are usually grouped into an array, a sub-panel of boards with its own borders, and the array repeats across the production panel. More boards per array does not mean more boards per panel: an array with fewer boards can fill the panel with less waste and yield more.
The panel size. The standard 18 x 24 inch panel is not always the best one for your board. Your supplier may run several panel sizes, and a different one can fit more boards with less waste. The best array changes with each panel size too.
The board size itself. Early in design you still have room to adjust the outline. Making a board a fraction smaller eventually crosses a threshold where more boards fit, and the saving repeats on every panel for the life of the product.
The common mistake is to optimize the board on its own. The number that decides your cost is how many boards fit on the fabricator's panel after the border areas reserved for tooling are removed. Start from that available space, try the board with and without rotation, and count boards per panel against the price of that panel. Now you are comparing what you actually pay for.
Board outlines usually land on a round number, or wherever the mechanical drawing ended up. There is often a slightly smaller size that crosses a threshold and fits more boards per panel, and the saving repeats on every panel for the life of the product. The hard part is finding that threshold by hand, because it moves with rotation, spacing, the array, and the panel size all at once.
KwickFit's Analyze Part Size to Increase Yield runs that search. You give it the board, and it finds the reduced size at which more boards fit, so you can decide whether the mechanical tradeoff is worth it while you still have room to make it.
Once rotation, spacing, the array, and the panel size all interact, there are more combinations than you can work through by hand. KwickFit's Auto Matrix Array finds the best array for each panel size automatically, and you can compare the result across the panel sizes your fabricator runs in seconds. You enter your board and panel dimensions, with no CAD or Gerber files, and see boards per panel and material utilization for each option. The point is to settle the expensive layout decision on evidence, before it is locked in.
Boards per panel is the lever behind cost per board at volume. A large share of the cost of a panel is fixed no matter how many boards are on it, so fitting more boards on the same panel spreads that cost across more of them, and each board costs less to build. One extra board per panel sounds small until you multiply it by every panel in a production run. The companion article below puts real dollars on it.
No CAD or Gerber files. Enter your dimensions and see boards per panel in seconds.
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Related: The PCB Cost Cliff shows what these layout decisions are worth in real dollars, and which PCB panel tool you actually need.