How Often Should You Sharpen a Japanese Knife?

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Updated August 2026 · 6 min read · UK Japanese knife specialists

Japanese-steel knives are made to be thin, hard and, above all, sharp — it is what makes hard VG10 and AUS-10 blades (around 60–61 HRC) cut so cleanly. Keeping that edge is simpler than most people think, but it hinges on understanding one thing: sharpening and honing are not the same job, and you do them at very different frequencies.

This guide clears up the confusion and tells you how often you really need to sharpen a Japanese knife, when to do it, and how to tell the moment has come.

The difference between honing and sharpening

Most of the confusion around this subject comes from the words themselves. Maintaining a sharp knife is something you should do almost every time you cook — but that is honing, not sharpening. Honing realigns and smooths the very edge of the blade, removing tiny burrs and folds so the existing edge keeps performing. No meaningful amount of steel is removed.

Sharpening is different. When you sharpen a knife on a whetstone you remove a thin layer of steel to form a completely new edge. Because it removes metal, sharpening should only be done once the blade has actually started to dull — not as a routine. Do it too often and you wear the blade down faster than you need to.

If you want the full picture of which tool does which, see our guide to whetstones vs honing steels.

How often should you sharpen a Japanese knife?

As a general rule, sharpen your knife a few times a year if it is used for normal cooking at home. If you are a professional using the same knife extensively every day, expect to sharpen it far more often — once or twice a month is common.

Honing follows a different rhythm entirely. The most common advice is to hone before or after each use. If you only cook once a week, honing once a week is fine; if you cook daily, hone daily. A few light passes on a fine honing or diamond steel is all it takes — over-honing can damage the edge, so treat it as maintenance, not sharpening.

The exact number matters less than the principle: hone often to hold the edge, and sharpen only when honing no longer brings it back.

When should you sharpen a Japanese knife?

The single most important factor is simply how dull the blade has become. A few honest tests tell you when the time has come:

The paper test. Hold a sheet of printer paper and slice down through it. A sharp knife glides through cleanly; a dull one snags, tears or slides off. This is the safest, clearest check.

The effort test. A truly sharp Japanese-steel knife should cut fruit and vegetables with almost no downward force, in a smooth up-and-down motion. If food is crushing or staining the board, or you find yourself sawing, the edge is already dull.

When honing stops working. If you hone regularly, you will feel it the moment the edge no longer responds — that is your cue to sharpen. This is why regular honing is the best early-warning system a knife owner has.

A few other factors speed up dulling: heavy daily use, and cutting harder or more abrasive foods (meat and especially bone) rather than soft fruit and vegetables. Always keep hard VG10/AUS-10 edges off bone and frozen food, and hand-wash and dry the blade — good habits stretch the time between sharpenings. For more on protecting the edge, see our complete Japanese knife care guide.

Final thoughts

Sharpening is an abrasive process, so do it sparingly — only once the blade genuinely begins to dull. Keeping the knife sharp day to day is a different matter: hone it as often as you use it, and it will hold a fine edge far longer. Get that balance right and, for most home cooks, sharpening a couple of times a year is all a good Japanese-steel knife ever needs. When you do sharpen, our guide on how to sharpen VG10 blades walks you through it step by step.

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