Cutlist Calculator

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Fact Checked & Reviewed by: David Chen, Master Craftsman & Structural Engineer

Optimize your woodworking projects and minimize waste with our professional Cutlist Calculator. Simply enter your stock dimensions and required part sizes to determine the most efficient layout.

Cutlist Calculator

Enter values to see results

Cutlist Calculator Formula

Boards Required = CEIL( Total Qty / FLOOR( (Stock – Kerf) / (Part + Kerf) ) )

Formula Source: Fine Woodworking Efficiency Standards | Lumber Math References

Variables:

  • Stock Material Length: The standard length of the raw lumber or board you are starting with.
  • Part Length: The final dimension of the specific pieces you need to cut.
  • Quantity: The total number of finished parts required for your project.
  • Blade Kerf: The thickness of the saw blade (the material that turns into sawdust during the cut).

What is a Cutlist Calculator?

A Cutlist Calculator is an essential tool for carpenters, cabinet makers, and DIY woodworkers. It solves the linear optimization problem of how to extract multiple shorter pieces from standard stock lengths (like 8ft or 10ft boards) while accounting for the width of the saw blade.

By using this tool, you can significantly reduce project costs by purchasing exactly the amount of lumber needed and identifying potential scrap pieces before you make your first cut.

How to Calculate Cutlist (Example)

  1. Measure your Stock Length (e.g., 96 inches).
  2. Identify your Part Length (e.g., 30 inches).
  3. Subtract the Kerf (e.g., 0.125″) from the stock to account for the first trim cut.
  4. Divide the usable space by (Part + Kerf). 96 / 30.125 ≈ 3.18.
  5. Take the Floor: You can get 3 pieces per board.
  6. If you need 10 pieces, 10 / 3 = 3.33. Ceiling: You need 4 boards.

Frequently Asked Questions (FAQ)

What is a standard kerf size?

Most standard table saw blades have a kerf of 1/8″ (0.125 inches). Thin-kerf blades are typically 3/32″ (0.094 inches).

Does this calculator handle sheet goods like plywood?

This version focuses on linear lumber. For plywood, 2D nesting software is recommended, though you can use this for individual strip widths.

Why should I include a trim allowance?

Real lumber often has checked ends or staples. It is wise to subtract 1-2 inches from your Stock Length to account for “squaring up” the ends.

How can I minimize waste?

Adjust your part lengths slightly or use the leftovers from one board to fulfill smaller part requirements in the same project.

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