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A Japanese knife is only as good as its edge, and in Japan the edge comes from a whetstone. Pull-through sharpeners are quick, but they tend to chew up the thin, hard edges that make Japanese knives special. A whetstone is slower, but it is gentler, more precise and, once you get the hang of it, oddly relaxing.
The hardest part is knowing what to buy. This guide explains grit numbers in plain language and recommends a simple starter setup.
What grit numbers mean
Whetstones are labeled with a grit number. The lower the number, the coarser the stone and the more metal it removes. The higher the number, the finer the stone and the more polished the edge.
| Grit | What it does | When you need it |
|---|---|---|
| Under 400 | Removes a lot of metal quickly | Repairing chips or a badly damaged edge |
| About 1000 | Creates a new, sharp edge | Regular sharpening: the stone you will use most |
| 3000 to 6000 | Refines and polishes the edge | Finishing after the 1000 stone for a smoother, longer-lasting edge |
| 8000 and above | Mirror polish | Optional, for enthusiasts |
For most home cooks, a 1000 grit stone does almost everything. A finer stone (around 3000 to 6000) is a nice addition, which is why combination stones with a 1000 side and a 6000 side are so popular for beginners.
Soaking stones vs splash-and-go stones
- Soaking stones need to sit in water for around 10 to 15 minutes before use. Many classic Japanese stones, including the King combination stone, work this way.
- Splash-and-go stones only need a splash of water on the surface. They are quicker to set up, which makes it easier to sharpen little and often.
Best whetstones for beginners
Best first stone: King KW65 1000/6000 combination
The King combination stone is a made-in-Japan stone that many beginners start with. One side is 1000 grit for sharpening, the other is 6000 for finishing, and it comes with a plastic base. It needs soaking before use.
- Why we like it: covers sharpening and finishing in one inexpensive stone
- Good to know: softer stones like this wear faster and need flattening now and then
Best splash-and-go 1000 stone: Shapton Kuromaku #1000
Shapton’s Kuromaku (also sold as “Ha no Kuromaku”) stones are hard ceramic stones that need only a splash of water. The orange #1000 is a popular everyday sharpening stone that stays flat for a long time.
Upgrade set: Shapton Kuromaku #1000 + #5000
If you know you will keep sharpening, this pair gives you a fast-cutting 1000 stone and a 5000 finishing stone in the same splash-and-go style.
Alternative 1000 stone: Suehiro Cerax 1000
Suehiro stones are handcrafted in Niigata. The Cerax 1000 is a soaking stone (give it 10 to 15 minutes in water) and a solid alternative if you prefer that style.
Do not forget a flattening stone
Every whetstone slowly wears a dip in the middle. A dished stone makes it hard to sharpen evenly, so it is worth flattening it every few sessions. A coarse flattening plate or stone does the job in a minute or two.
How to sharpen a Japanese knife: the basics
- Soak the stone if it needs it, or splash it with water. Place it on a damp towel or its base so it does not slide.
- Hold the blade at a low angle to the stone, about 12 to 15 degrees per side for most Japanese knives.
- Push the edge across the stone in smooth strokes, working along the whole length of the blade. Keep the angle steady.
- Keep going until you can feel a slight burr (a tiny lip of metal) along the opposite side of the edge.
- Flip the knife and repeat on the other side until the burr moves back.
- Finish with a few light, alternating strokes on the finer stone if you have one, then rinse and dry the knife.
Take your time. Most people get noticeably better after three or four sessions, and a knife that is sharpened little and often is far easier to maintain than one left to go dull.
Quick picks
- Just starting: King KW65 1000/6000
- Want quick setup: Shapton Kuromaku #1000
- Ready to upgrade: Shapton Kuromaku #1000 + #5000 set
Still choosing a knife? See the best made-in-Japan chef knives under $150.