CutlistSaw kerf calculator
See how the width removed by the blade changes the number of pieces that fit on a board.
Saved only in this browser. Inputs stay in this tab’s session storage and are not transferred to the app.
Example calculation
Saw kerf calculator: worked out from the values already filled in the form above.
Inputs
- Measurements in: Millimetres
- Saw kerf: 3
- Stock length: Length 2,400 · Quantity 2
- Quantity: Length 700 · Quantity 4
Result
- Offcuts and sawdust (%): 41.667%
- Stock length 1: 2,400 mm → 700 mm + 700 mm + 700 mm
- Remaining: 291 mm
- Total saw-cut loss: 9 mm
- Stock length 2: 2,400 mm → 700 mm
- Remaining: 1,697 mm
- Total saw-cut loss: 3 mm
How the calculation works
Kerf is the width removed by the blade, not a gap that can become another usable piece. The planner counts the cuts between pieces and the final cut needed to separate a remaining offcut. It never gives that sawdust back as usable stock.
Three 400 mm pieces do not fit into a 1200 mm board when the kerf is 3 mm. Two pieces fit, leaving 394 mm after the two separating cuts. End trimming and defects need additional allowances in your stock dimensions.
Related tools
Lumber cut list planner
Enter stock boards, required pieces and kerf. Inspect the resulting cuts and any pieces that do not fit.
02Board foot calculator
Enter actual board dimensions to total the volume, waste allowance and optional cost.
03Cubic feet of lumber
Calculate CFT from actual dimensions, with the same inputs available in metric or inches.