Free tool
Japanese Knife Picker
Not sure whether you want a gyuto, santoku, nakiri or petty, or what length? Answer three questions and this picks a starting point.
How this works
Lengths are the edge length most makers list. Most home cooks find a 210 mm gyuto the easiest all-rounder. A 240 mm blade is faster on large prep but needs more board and more confidence. The board size uses a simple rule: blade length plus about 4 inches.
Sources: Maker specifications for blade lengths; USDA FSIS: Cutting Boards and Food Safety for board hygiene.