Free tool

Cutting Board Size Calculator

Enter your longest knife and your counter depth and this suggests a board size that fits both.

How this works

The rule of thumb is a board several inches longer than your longest blade, so the tip and heel never hang off the edge, and a depth that leaves some counter free in front of it. Larger jobs get extra length.

Sources: USDA FSIS: Cutting Boards and Food Safety for board hygiene.

Rules of thumb, not guarantees. Check the maker's own specs and care instructions for your knife or board. Last reviewed October 28, 2026 by The Cutting Board Guide team.