---
title: "What Is Kerf? Why Every Cut List Needs It"
description: "The width of your blade quietly changes every measurement. Here is how to handle it correctly."
image: "https://nestingcalc.com/og-default.png"
url: "https://nestingcalc.com/guides/what-is-kerf/"
locale: "en"
---

# What Is Kerf? Why Every Cut List Needs It

The width of your blade quietly changes every measurement. Here is how to handle it correctly.

## Kerf defined

Kerf is the slot a saw removes as it cuts — the material converted to sawdust. A blade is not a line of zero width: typical kerf values are 2–3.5 mm for circular saws, 1–1.5 mm for bandsaws, and under 1 mm for laser and waterjet cutting.

## Why it compounds

Cut three 2000 mm parts from a 6000 mm bar and you might assume it fits with 0 mm to spare. With a 3 mm kerf you need 6018 mm — the last part is 18 mm short. This is the single most common reason hand-made cut lists fail.

## Kerf in both directions on sheet goods

On a sheet, kerf applies to both rip cuts and crosscuts, so it reduces usable width and height alike. The sheet cutting calculator reserves kerf between every part, both horizontally and vertically.

## Measure your own kerf

Cut a scrap piece, measure the slot width at several points, and average. A fence-side blade with side wobble or a dull blade cuts wider than its nominal width. Enter the measured value — not the catalog value — into the kerf field.

## Bottom line

Kerf awareness is the difference between a plan that works and one that costs you a re-cut. Both NestingCalc calculators make it a first-class input — use it.

[Open the linear cutting calculator](https://nestingcalc.com/linear-cutting-calculator/) [Open the sheet cutting calculator](https://nestingcalc.com/sheet-cutting-calculator/)

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