Simply put, the saw kerf is the thickness of the cut made by a blade.
Typically, the kerf width of a blade is listed clearly on the blade packaging, but you can cut a scrap piece of wood to measure the kerf of your blade.
When you measure a board to cut, you always mark it with a thin pencil line.
You always want to cut on the outside edge of that line to make sure that the saw kerf does not take away any of the board you need.
There are a few things that determine the kerf of a saw blade: – the width of the blade – the way the carbide teeth are angled away from the blade – wobble of the blade.