The standard angle for Japanese double-bevel knives is 15 degrees per side, or 30 degrees in total. This angle, which is narrower than that of a European knife (18 to 20 degrees), is made possible by the hardness of Japanese kitchen knife steels. For single-bevel blades (Deba, Yanagiba), the angle of the beveled side is similar, but the technique is completely different.
Japanese knife sharpening angle: which angle to choose for your blade
The angle of double-bevel Japanese knives — Gyuto, Santoku, Nakiri, Bunka
For double-bevel Japanese knives — Gyuto, Santoku, Nakiri, Bunka, Petty — the standard angle is 15 degrees per side, or 30 degrees in total. European knives are sharpened between 18 and 20 degrees. A Gyuto sharpened to 15 degrees penetrates food with less resistance. On a Petty, controlling pressure is essential. Reference method: two stacked coins under the spine of the blade give approximately 15 degrees.
How steel affects the optimal angle
The hardness of the steel determines the angle the edge can maintain over time. The harder the steel, the steeper the angle can be without chipping. Carbon steels (Aogami, Shirogami) sharpen quickly and hold angles of 10 to 15 degrees well. Stainless steels (VG-10, Ginsan) support 15 degrees with consistent performance. Powder steels (SG2) require more passes, but retain the edge longer.
The most common sharpening angle mistakes and how to fix them
A knife that dulls quickly after sharpening likely has an angle that is too shallow for its intended use or for the steel. Micro-chipping along the edge indicates an angle that is too shallow for hard materials such as bone. An uneven bevel indicates that the angle was not kept consistent: correct this by adjusting the pressure on the coarse stone before finishing, without abruptly widening the existing bevel. If the original bevel is unknown or damaged, entrust the knife to a specialist before attempting any home maintenance.
When to hire a sharpening specialist
Regular maintenance of a cutting edge in good condition can be done at home on a whetstone. A specialist is preferable in the following cases: damaged bevel, unknown angle, chips, broken tip, reprofiling, or single-bevel blade. Stay Sharp offers a sharpening service on a whetstone at its Montreal and Quebec City stores, and by mail throughout Canada. Each knife is worked on at least three successive grits.
Frequently Asked Questions
What angle should I use to sharpen a Japanese knife?
What is the difference between a 15° edge and a 20° edge?
At 15 degrees, the blade penetrates food with less resistance—ideal for precision cuts. At 20 degrees, the edge holds up better under pressure and withstands heavy use more effectively. The 5-degree difference is significant in terms of perceived sharpness and edge retention. Japanese knives maintain a 15-degree edge thanks to their hard steel. It is still possible to sharpen a Japanese knife to 20 degrees, but this reduces the advantage of its blade geometry.
How can I find out the sharpening angle of my knife?
Marker method: color the edge, make five to ten passes over the stone, and observe where the color has disappeared—the area that has been removed corresponds to the current angle. Coin method: two coins stacked under the back of the blade give approximately 15 degrees; three coins give approximately 20 degrees. Japanese manufacturers do not always systematically indicate the angle—15 degrees remains the usual convention for double bevels.
What is the angle of single-bevel Japanese blades?
Kataba blades (single-bevel) — Deba, Yanagiba, Usuba — have a bevel on one side. This side is worked at 10 to 15 degrees depending on the format. The flat side receives only a few passes to remove the burr, without applying an angle. Asymmetry is fundamental: it is the main difference compared to ryoba knives (double bevel). Progressing from the heel to the tip while keeping the flat side at a zero angle requires practice and experience.
Do you need an angle guide to sharpen a Japanese knife?
An angle guide (clip attached to the back of the blade) helps beginners maintain 15 degrees without having to memorize the motion. For experienced users, checking the burr is generally sufficient. Angle guides are compatible with double-bevel Japanese knives, but are not suitable for kataba blades. Stay Sharp offers sharpening accessories in-store, including angle guides. A guide makes learning easier, but regular practice on the stone is what builds consistent angle accuracy.