Kerf Width Calculator

Inputs

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Finished length of each repeated part after cutting.
ft
Number of repeated finished pieces.
pcs
Number of kerfs to charge. One cut per finished piece is common when an end is trimmed first; use one less if your layout truly shares a starting edge.
cuts
Material removed by one saw cut, router pass or abrasive cut.
in
Extra length reserved to square an end, clean a defect or allow final trimming.
in
Length of one purchased board, stick, rail or trim piece.
ft
Cost of one stock board or trim length, used to estimate the equivalent cost of material lost to kerf.
$/stock

Results

Default result
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Required stock length (L_req)
18.17 ft
Pass

finished parts + kerf + trim

Also computed

Stock pieces needed (N_stock) Caution 3 stock pcs

length-only count before detailed packing

Saw kerf loss (L_kerf) Pass 1.5 in

12 charged cuts

Remaining offcut (L_left) 5.833 ft

Length yield (Y) 75 %

12 finished pieces

Kerf share of required length (k%) 0.6881 %

Kerf material cost (Cost_kerf) 0.1875 $

Method notes 3 notes
  • Kerf loss = blade kerf width x charged saw cuts.
  • Required stock length = finished piece length x quantity + kerf loss + end trim.
  • Stock pieces needed is a length-only screen. Mixed lengths, grain matching, defects and board-by-board packing belong in the cut-list calculator.

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