Before you begin
Paper or a spreadsheet, finished dimensions, stock dimensions, and a measured kerf. Start with the paper example.
What this lesson covers
- Distinguish finished size from a rough blank.
- Account for each actual separating cut.
- Reject a high-yield layout that cannot be supported or cut safely.
Recommended preparation
01 / Key concepts
How it works
A useful cut list includes finished sizes, rough allowances, quantities and grain direction. Add the material needed for milling, trimming and saw kerf before laying the parts out on your stock.
- Kerf
- The width of material removed by a cut, not necessarily the blade plate thickness.
- Rough allowance
- Additional stock reserved for milling or trimming before final sizing.
Calculate rough sizes from finished dimensions
List the parts that the project requires, then add the material needed to mill, trim, and cut them cleanly. The initial blank is often larger than the finished part by design.
Treat kerf as consumed stock
Each separating cut removes material. Include the blade or cutter path in the plan, especially when you are close to the limit of a board or sheet, and leave room for any final clean-up cut.
Check the cutting sequence
The layout with the least waste is not automatically the best shop plan. Keep support, grain direction, safe handling, part labels, and the order of operations visible before you start breaking down material.
Key points
- A cut list must show more than finished dimensions: quantity, rough size, grain direction, trim, kerf, and part identity all matter.
- Kerf is stock removed by the cut, so it belongs between parts.
- The tightest nesting plan may not be the best safe breakdown plan.
02 / Worked example
Do three 300 mm parts fit?
A 1,000 mm board needs three 300 mm finished parts. For this simplified length-only plan, allow 20 mm total end trim including its cutting loss, plus three separate 3 mm part-separating cuts. No additional milling allowance is assumed.
| Stock use | Calculation | Length |
|---|---|---|
| Finished parts | 3 × 300 | 900 mm |
| Separating kerfs | 3 × 3 | 9 mm |
| Trim allowance | Total reserved | 20 mm |
| Remainder | 1,000 − 900 − 9 − 20 | 71 mm |
Check whether the parts fit
Change the board length and compare the remaining stock. Find the shortest board that fits the three parts and allowances.
This length calculation includes three identical parts, three separating cuts and 20 mm total trim, including trim-cut loss. It excludes milling allowance, grain, defects, support and cutting sequence.
1000 − (3 × 300) − (3 × 3) − 20 = 71.0 mm. The parts fit by length. Check width, grain direction, stock condition and the cutting sequence separately.
03 / Workshop exercise
Apply the method
Work through the drawing or setup review first, then use a sample that matches your project. Check the equipment and safety requirements above before starting any machine work.
- Choose three simple parts from one board or sheet.
- Add rough size, trim, kerf, grain direction, and labels before you draw the layout.
- Write the cut sequence that keeps the material supported and the parts traceable.
Common mistakes
- Optimizing material yield before deciding which face or grain needs to show.
- Forgetting the last trim cut after a rough breakdown.
- Losing part identity after the first crosscut.
Take it further
Rebuild the example with rough-milling allowance on each part. Compare a length-only budget with a labeled two-dimensional layout.
Workshop checklist
Use this topic checklist alongside your machine’s full setup procedure.
- List quantities and finished dimensions for every part.
- Add rough-milling and trim allowance where the process needs it.
- Include kerf, cutter loss, and sheet trim in the stock plan.
- Keep grain direction and show faces visible in the layout.
- Label parts and choose a safe breakdown sequence before cutting.
04 / Review questions
Review the key decisions
Consider each question, then compare your answer with the explanation. Return to the worked example whenever you need it.
1. Why does this example count three kerfs instead of always using parts minus one?
View hint
Draw the offcut after the last part.
View explanation
Each of the three parts is separated from the remaining board. Other layouts can need a different number of cuts. Count the actual cut plan rather than applying one rule to every layout.
2. Would a 905 mm board fit the same plan?
View hint
Add all consumption before comparing stock length.
View explanation
No. The plan requires 929 mm, leaving a 24 mm shortfall. Use longer stock or revise the parts and cutting plan.
05 / Project notes
Notes for your next project
Check off the topics you have reviewed and record anything useful for your next build. This tracks your learning progress; use your equipment’s setup procedure for machine checks.
Record: Stock dimensions, finished and rough part sizes, grain direction, kerf, trim allowance, cut order, and actual yield.
No notes recorded. Use this space for your observations.
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Check each topic above to mark the lesson as reviewed. You can browse any lesson at any time.
Related calculators
Use your project measurements and costs in the calculators below. Check the results against the stock, equipment and requirements of the job.
Practice with a complete project
Apply the lesson to measured dimensions, then keep the drawing, material list and build checks together.
Sources & further study
WoodWorkCalc writes the exercises and illustrative examples. Named historical cases are attributed separately. These sources support the principles identified in the lesson; their publishers do not endorse WoodWorkCalc. Guidance and platform features can change. Sources retain their own copyright and licensing terms.
- USDA Forest Products Laboratory — Wood Handbook: Wood as an Engineering Material (opens new tab)
Public technical reference for wood structure, moisture relationships, properties, and dimensional behavior.
Forest Products Laboratory. 2021. General Technical Report FPL-GTR-282.
- Woodwork Career Alliance of North America — Skill Standards Overview (opens new tab)
Public overview of competency-based woodworking skill standards and progressive learning.
Woodwork Career Alliance of North America. Skill Standards Overview. Accessed September 2026.