PCB Panel Utilization and Boards per Panel Calculator
Board price is often set by how many pieces fit on a manufacturing panel. A few millimeters of gap or rail can cost you a whole row. This calculator tests both orientations and shows the boards per panel, utilization and cost per good board.
Your numbers
18 by 24 inch is 457 by 610 mm.
Tooling holes, fiducials, plating border.
Routing or v-score allowance.
Your results
Simple rectangular grid layout. Mixed rotations, breakaway tabs and mouse bites can change the real count, so confirm with your fabricator.
Boards per panel vs gap between boards
Sweeps Gap between boards from 0 to 15, holding your other inputs fixed.
Panel data in your item master
Optional: a short review of how fabrication and panel costs could be tracked by revision.
Optional. The tool and every export work without this. No spam.
How to use it
Enter the board size and the panel size your fabricator uses. Standard panels are commonly 18 by 24 inches (457 by 610 mm), though fabricators differ. Set the unusable edge on each side and the gap between boards, which depends on whether you route or v-score. Add the panel cost and fabrication yield for a cost per good board. The calculator checks upright and rotated layouts and takes the better one.
The formula
Usable width is panel width minus two rails. Columns are the floor of usable width plus the gap, divided by board width plus the gap. Rows work the same way. Boards per panel is columns times rows, and the calculator evaluates both orientations. Utilization is total board area over panel area. Cost per good board is the panel cost divided by boards times yield.
Reading the result
Utilization alone is not the goal, because assembly panels have their own rail and tooling needs. Use the chart to see where a small reduction in gap or board size adds a row or column, and the cost per board drops in steps. A one millimeter change in board dimension can be worth more than negotiating a few cents off the unit price.
Common mistakes
Quoting the board outline without the routing allowance leads to optimistic counts. Another mistake is optimizing the fabrication panel without checking the assembly array, which must fit conveyor, stencil and fixture limits. Finally, remember that mixed layouts, with some boards rotated, can add pieces but complicate depanelization.
Frequently Asked Questions
What is a typical panel border?
It varies by fabricator, and values around ten to fifteen millimeters per side are common for bare board fabrication. Always use the figure on your fabricator's design guidelines.
Does this work for assembly arrays?
Yes with different inputs. Use the assembly array size limits as the panel, the rail width for conveyor handling, and the gap for your depanelization method.
Why is rotated sometimes better?
A rotated board can leave less wasted strip at the edge. The calculator tests both so you do not need to guess.
Does yield come from the fabricator?
Ask your fabricator for typical yield on your technology and layer count. A complex board or fine pitch design will see lower yield, which raises the cost per good board.
If board and panel data sit in your item master or routing, Netray can help check them against fabricator quotes and flag cost changes by design revision.
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