Nesting Efficiency Calculator

This calculator uses simple grid nesting -- rows and columns of parts in either the normal or 90-degree-rotated orientation, whichever packs more parts. True nesting software can rotate parts at arbitrary angles, interlock irregular shapes so they share edges, and mix orientations across a single sheet, which routinely recovers meaningfully more usable material than a rectangular grid can, especially for non-rectangular or oddly proportioned parts.

Kerf is the material width the cutting process itself consumes -- the gap needed between adjacent parts so the cut doesn't damage the neighboring piece. Because that gap gets added to every part's footprint before the grid is laid out, a larger kerf (as with plasma cutting versus laser cutting) can push a part dimension just past a sheet's row or column boundary, dropping the whole-number parts-per-sheet count by one even though the part itself didn't get any bigger.

Because each sheet only yields a whole number of parts, the sheets-needed figure rounds up to the next full sheet once the order quantity isn't an exact multiple of parts-per-sheet. The last sheet cut typically produces some parts beyond what was ordered -- worth knowing when quoting a job or planning raw material purchases, since the excess is a real cost even though it isn't waste in the scrap sense.

Not always -- for square or near-square parts, rotating makes little or no difference, and for some sheet-and-part proportions the un-rotated layout already packs more parts. This calculator computes both orientations and keeps whichever yields more parts per sheet, so the reported result already reflects the better of the two without requiring you to check manually.