KerfCalc

Cut List Optimizer

Work out how to cut your parts from full sheets with the least waste. Accounts for saw kerf and grain direction, and gives you scaled diagrams plus a printable cut list. Everything runs in your browser — nothing is uploaded, no sign-up.

Sheet stock

Locked parts keep their orientation

Parts to cut

Part nameLengthWidthQtyGrain locked

Notes

Why the kerf matters

Every cut removes a strip of material. Enter the actual cutting width of your blade, rather than the thickness of its steel body. The 3 mm default is an example: measure a test cut for your saw. Ignore the kerf and a layout that looks perfect on screen can come up short on the last piece.

How the layouts are produced

Only guillotine cuts are used: every cut runs edge to edge across the piece, which is what a table saw or panel saw actually does. Six sorting strategies and three splitting rules are tried, and the best result is kept.

What this does not do

It does not sequence your cuts for you, and it assumes every sheet is identical and defect-free. Check the diagram against your actual sheet before cutting — knots, damaged corners and factory edges are not accounted for.

Worked example: six plywood panels

Use a 2440 × 1220 mm sheet, 3 mm kerf and zero edge trim. Enter three panels at 720 × 560 mm, two at 800 × 560 mm and one at 596 × 560 mm. These are example part dimensions, not a complete cabinet design.

Parts to enter in the calculator
PartLength × widthQuantity
Panel A720 × 560 mm3
Panel B800 × 560 mm2
Panel C596 × 560 mm1

A feasible one-sheet arrangement uses two 560 mm-wide rows. Three A panels need 3 × 720 + 2 × 3 = 2166 mm before separating the end offcut. The two B panels and one C need 800 + 800 + 596 + 2 × 3 = 2202 mm. Across the sheet, the two rows and their separating cut need 560 + 3 + 560 = 1123 mm.

The finished parts occupy 2,439,360 mm² of the 2,976,800 mm² sheet, about 81.9%. The rest includes both offcuts and sawdust; it is not all reusable material. The optimizer may find a different arrangement.

Why area alone does not tell you the sheet count

Dividing total part area by sheet area gives only a lower bound. Part shape, kerf, edge trim and rotation restrictions can make a set of parts require another sheet even when its combined area seems small enough.

How to handle grain, edge trim and mixed materials

Enter every part in a consistent orientation, enable “Respect grain direction” and lock the parts whose orientation must stay fixed. Edge trim is removed from each of the four sheet edges: a 10 mm trim leaves 2420 × 1200 mm usable on the example sheet. Run a separate optimization for each material and thickness.

Does it guarantee the absolute best layout?

No. The tool compares 18 combinations of sorting and splitting rules and keeps the result using the fewest sheets. It is a practical heuristic, not a proof of the mathematical minimum. Inspect the layout, allow for real defects, and plan a safe cutting sequence before starting.

Cutting narrow stock instead of panels? Use the linear cut optimizer for boards, bars and trim. Buying hardwood by volume? Use the board foot calculator.

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