How to Sharpen Japanese Knives: Whetstone vs Rolling Sharpener

A sharp knife is safer, faster and nicer to cook with, and Japanese knives hold a very fine edge when you look after them. This guide explains the main ways to sharpen at home (whetstone, rolling sharpener and honing steel), what whetstone grit numbers mean, and how to sharpen a knife step by step. It covers double-bevel knives like gyuto, santoku and nakiri.

Japanese chef knife on a wet whetstone on a kitchen counter with a towel underneath
A knife on a wet whetstone, ready to sharpen.

The short answer

  • Best result: a whetstone. Start with a 1000/3000 or 1000/4000 combination stone.
  • Easiest for beginners: a magnetic rolling sharpener, which holds the angle for you.
  • Very dull or chipped: a coarser stone, around 400 to 600 grit.
  • Polished edge: finish on a 3000 to 8000 grit stone.
  • Between sharpenings: a honing steel, used with a light hand.

Not sure which knife you have? See our guide to nakiri, santoku and gyuto, and protect the edge with an end grain cutting board.

Whetstone, rolling sharpener or honing steel

Method How it works Skill needed Best for
Whetstone You hold the knife at an angle and move it over a wet stone Medium, takes practice The finest, most controlled edge
Rolling sharpener The knife sits at a fixed angle and you roll it over magnetic discs Low Beginners and quick everyday sharpening
Pull-through sharpener You draw the knife through a slot Low A quick fix, but less control than a stone
Honing steel A rod that realigns a rolled edge; it does not remove much metal Low to medium Touch-ups between sharpenings

A whetstone and a rolling sharpener do the same job in different ways, so choose by how much practice you want to put in. Our rolling sharpener comes with 400 and 1000 grit discs, with finer polishing discs sold separately. For scissors as well as knives, there is a 4-in-1 sharpener. For quick touch-ups, there is the Mitsumoto Sakari honing steel, which is best used with very light pressure on Japanese knives.

Whetstone grit explained

Grit is the number that tells you how coarse a stone is. A low number is coarse and removes metal fast. A high number is fine and polishes.

Grit What it does When to use it
400–600 Coarse, removes metal quickly Repairing chips or very dull edges
1000 Medium, the main sharpening stone Regular sharpening of a dull knife
3000–4000 Fine, refines the edge After 1000 grit for a sharper, smoother edge
5000–8000 Very fine, polishes Finishing for a polished edge
10000+ Ultra fine Optional extra polish
Four Japanese whetstones in different grits lined up on a wooden board with a knife
Whetstones in different grits, from coarse to fine.

How to sharpen a knife on a whetstone

  1. Prepare the stone. Follow the instructions for your stone. Many water stones are soaked in water for about 10 to 15 minutes, until the bubbles stop. Place the stone on a damp towel so it cannot slide.
  2. Find the angle. Hold the blade at about 15 degrees to the stone, with the edge leading. Keep the handle low and your wrist steady.
  3. Sharpen with light pressure. Push the edge along the stone in smooth strokes, working along the whole length of the blade. Keep the stone wet.
  4. Raise a burr. After several strokes, you will feel a thin wire edge (a burr) on the opposite side of the blade. That tells you the stone has reached the edge.
  5. Flip and repeat. Do the other side with the same angle, using fewer strokes.
  6. Move to a finer grit. Repeat on the 3000 to 4000 side to refine the edge, with lighter pressure.
  7. Rinse and test. Wash and dry the knife and try it on a tomato or a sheet of paper. It should slice without pressure.
Close-up of hands sharpening a Japanese knife on a whetstone at a steady angle
Keep the angle steady and the pressure light.

How to use a rolling sharpener

  1. Set up the sharpener. Put it on a flat, stable surface and choose the angle setting that suits your knife.
  2. Start with the coarser disc, the 400 grit, if the knife is dull.
  3. Roll the knife over the sharpener in even strokes, from the heel to the tip, keeping the angle fixed.
  4. Turn the knife over and do the same on the other side.
  5. Finish with the 1000 grit disc for a finer edge, then rinse and dry the knife.

It is a good way to get a sharp edge without learning to hold an angle by hand. Follow the instructions that come with your sharpener for the exact setup.

Magnetic rolling knife sharpener with a chef knife on a wooden board
A rolling sharpener holds the angle for you.

Our recommended sharpeners and stones

A selection from our range, from a simple rolling sharpener to finishing stones. See them all in the sharpening tools collection.

Four-angle magnetic rolling knife sharpener with 400 and 1000 grit discsRolling Sharpener400/1000 grit discs Double-sided 1000 and 4000 grit sharpening stone for kitchen knives1000/4000 StoneBest starter stone Premium Japanese whetstone 600 and 3000 gritPremium Whetstone II600/3000 for dull edges Double-sided 3000 and 8000 grit sharpening stone for kitchen knives3000/8000 StoneFor refining and polishing Premium Japanese whetstone 5000 and 8000 gritPremium Whetstone5000/8000 for polishing Sanbonmori whetstone in three grit pairings from 1000 to 12000Sanbonmori WhetstoneThree grit pairings

Which to buy: for most people, start with the 1000/4000 stone. If your knife is very dull, the 600/3000 stone restores it first. For a mirror-like finish, add a 5000 to 8000 stone later.

How often to sharpen

Sharpen when the knife starts to slip on a tomato skin or crush instead of slicing. For most home cooks that is every few months. If you cook every day, you may want to refresh the edge more often with a quick pass on a fine stone or a few light strokes on a honing steel. Cutting on wood or an end grain board slows dulling, and glass or stone boards speed it up.

Common mistakes

  • Changing the angle during a stroke. A steady angle matters more than speed.
  • Pressing too hard. Let the stone do the work. Heavy pressure can chip a thin edge.
  • Letting the stone dry out. Keep it wet so the surface does not clog.
  • Skipping the burr. If you do not raise a burr, you have not reached the edge yet.
  • Using the dishwasher. It dulls and damages knives. Hand wash and dry, as in our care guide.

Frequently asked questions

What grit whetstone do I need for a Japanese knife?

A combination stone of 1000 and 3000 or 4000 grit covers most home sharpening. Use the 1000 side to restore the edge and the finer side to refine it. Add a 5000 to 8000 stone later if you want a polished finish, and a 400 to 600 grit stone if a knife is very dull or chipped.

What angle should I sharpen a Japanese knife at?

Many Japanese double-bevel knives are sharpened at about 15 degrees per side, which is a little shallower than many Western knives. Check what your knife's maker recommends and keep the angle steady through each stroke.

Is a whetstone better than a rolling sharpener?

A whetstone gives you more control and a finer edge, but it takes practice. A rolling sharpener holds the angle for you, so it is easier and cheaper to start with. Many people begin with a rolling sharpener and move to a whetstone later.

How often should I sharpen my knives?

Sharpen when the knife starts to slip on a tomato skin or crush instead of slicing. For a home cook that is often every few months, depending on how much you cook and what board you use.

Can I sharpen a Damascus knife on a whetstone?

Yes. A Damascus pattern is made by layering steels, and you sharpen the edge the same way as any double-bevel knife. Use light pressure and a steady angle.

Ready to sharpen? Browse our sharpening tools and Japanese knives.

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