Saw Blade Kerf Calculator
Budget sawdust loss for repeated cuts across a batch of equal boards.
Quick answer. Kerf is the width of material removed by a cut. Multiply measured kerf by the actual number of cuts to budget the loss. For eight cuts on each of two boards, a ⅛-inch kerf consumes 2 inches of combined stock length. See the method and references
Set up your calculation
An illustrative example is loaded. Replace its values with your measurements, costs or documented settings.
Calculation
Your result
- Total cut count
- 16
- Batch kerf loss
- 2 in
- Remaining batch length
- 190 in
- Kerf loss
- 1.042 %
The quote handoff carries your inputs and assumptions. Only an explicit base cost is suggested as a quote cost; prices, rates and measurements remain planning notes.
How it works
Batch kerf loss = kerf × cuts per board × board count. Remaining length = board length × board count − batch loss.
- Measure the actual cut width, not blade plate thickness. Cuts are counted per board, including trimming cuts. All lengths use the selected unit.
Keep cut width out of your finished dimensions
Formula and units
- Total cuts = cuts per board × board count
- Batch loss = measured kerf × total cuts
- Remaining length budget = board length × board count − batch loss
All length inputs must use the selected unit. This is linear stock accounting for repeated cuts across equal boards; it is not a nesting calculation. Measure a square test cut for the setup being planned.
| Kerf input | Metric equivalent | Combined length lost |
|---|---|---|
| 0.091 in | 2.3114 mm | 1.456 in |
| 3/32 in (0.09375) | 2.38125 mm | 1.500 in |
| 1/8 in (0.125) | 3.175 mm | 2.000 in |
Freud lists a 0.091-inch kerf for its LU83R010 thin-kerf blade [1]. The fractional rows are comparison examples, not exact specifications for all thin-kerf or full-kerf blades. Use a measured cut or the exact blade specification, not the category name.
Two 96-inch boards for a batch
At eight cuts per board and 0.125-inch kerf, each board loses 1 inch. Two boards lose 2 inches out of 192, leaving a combined length budget of 190 inches (1.04% lost to kerf). Include actual trimming cuts in the count. A 190-inch total does not prove that your individual parts fit on the two boards.
What your result means
- Which side of the line?
- Keep the blade’s removed width on the waste side of the finished dimension. Mark the face and reference edge so repeated parts are measured consistently.
- How many cuts?
- Count the actual separations and trimming operations, not just the number of parts. A piece ending at an existing usable edge may not need another cut.
- A different blade
- A thinner kerf changes the allowance. Check the saw’s blade, guard and riving-knife compatibility before changing the setup.
Assumptions and limits
Blade plate thickness and kerf are different measurements. Runout and the cutting setup can change actual cut width. This tool excludes defects, end-trim lengths and grain restrictions; add those separately and use a cut-list planner to test fit.
Sources and content notes
- Freud LU83R010: thin-kerf combination blade specification
The specific 0.091-inch kerf example. Other blade models may have different dimensions.
Maintained by WoodWorkCalc · Reference content updated . Equations and worked values were checked against the calculator implementation. Scenarios are illustrative; they are not field-test records or independent technical certification.
Continue planning
Budget cutting loss in millimeters
| Input or step | Example value |
|---|---|
| Length of each board | 2,400 mm |
| Measured kerf | 3 mm |
| Cuts per board | 8 |
| Board count | 2 |
| Total cutting loss | 3 × 8 × 2 = 48 mm |
| Remaining batch length | 4,800 − 48 = 4,752 mm |
Select millimeters for all length inputs. Remaining batch length is a budget across two boards, not one continuous piece.
Common questions
Is kerf the blade’s plate thickness?
No. Kerf is the width actually removed by the cut. Measure a test cut with the blade and setup you will use.
Do trim cuts count?
Yes. Include each actual trimming or separating cut in the count for each board.
Learn the method in the Academy
Follow the matching lesson or workshop reference before applying the result.
Use this in your project
Continue with the next measurement or cost, then keep the assumptions with your quote.
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