What kerf should I enter in a cut optimizer?
Enter the width of material your tool removes on one cut. If you have the blade spec, use its listed kerf. If not, make one test cut in scrap and measure the slot with calipers. For tube cutters that displace material instead of removing a chip, use 0 or a very small allowance.
The goal is not a perfect universal number. The goal is a number that matches the saw, blade, and material on this job closely enough that the printed cut plan survives the shop floor.
Typical kerf width table
| Tool | Typical kerf | Use for |
|---|---|---|
| Metal bandsaw | 1/16 in to 3/32 in (1.6 to 2.4 mm) | Steel bar, tube, pipe, extrusion |
| Cold saw | 3/32 in to 1/8 in (2.4 to 3.2 mm) | Accurate metal cuts |
| Abrasive chop saw | 1/8 in or more (3.2 mm+) | Steel and rebar rough cuts |
| Standard miter saw blade | About 1/8 in (3.2 mm) | Lumber, trim, aluminum with the right blade |
| Thin-kerf woodworking blade | About 3/32 in (2.4 mm) | Lumber and boards |
| Wheel tube cutter | 0 to 1/32 in (0 to 0.8 mm) | Copper, PVC, small tubing |
These numbers are practical starting ranges, not standards. Tooth set, blade wear, wheel thickness, and blade wobble all change the real cut width.
Why do metal and wood kerfs differ?
Woodworking blades often use wider carbide teeth, while metal bandsaw blades can be narrower but still need tooth set to clear the cut. Abrasive wheels remove material by grinding, so their kerf can be wider and less consistent as the wheel wears down.
That is why a generic 1/8 inch assumption is sometimes fine for lumber and sometimes wrong for a bandsaw or tube cutter. Match the value to the process, not just the material.
How does kerf change the number of sticks I need?
Kerf is charged between adjacent parts on the same stock piece. Four parts on one stick need three cuts between them, so the stock must cover the four part lengths plus three kerfs. Ignore the kerf and a layout that looks full on paper may be physically impossible.
NestSolver subtracts the kerf on every layout it produces. Enter the real kerf once, then the optimizer decides which parts fit on each bar, pipe, tube, conduit, or board.
Put it into practice — it's free and there's no sign-up.
Try the kerf-aware cut optimizer