What Grit Whetstone Do You Need? A Beginner's Guide (1000, 3000, 6000+)

“What grit whetstone should I get?” is the question we hear most, and the honest answer is shorter than most charts make it look. As a Japanese whetstone maker, we’ll explain what the numbers actually mean, give you a grit chart you can trust, and — importantly — warn you about the one place grit numbers lie to you (the JIS vs. ANSI problem). Then you’ll know exactly which grit to buy. (New to sharpening altogether? Start with our beginner’s guide to sharpening on a whetstone.)

01 · What “grit” actually means

Grit is simply the size of the abrasive particles bonded into the stone. A low grit number = large particles that cut steel fast but leave deep scratches. A high grit number = tiny particles that remove very little steel but leave a smooth, refined surface. So grit is a trade-off between speed of cutting and smoothness of finish — not a simple “bigger number is better” scale.

This matters because a knife gets sharp when you grind a clean, thin apex and then remove the burr — not because you reach some magic high number. A properly finished #1000 edge already slices tomatoes and paper effortlessly. Everything above that is refinement, not rescue.

02 · The whetstone grit chart

Here is the range you’ll see on Japanese water stones (numbers are JIS — more on that below), and what each band is really for:

Grit band	Typical numbers	What it’s for	How often you need it
Coarse	#120 – #400	Repair chips, reshape a bevel, revive a badly dull/rounded edge, thin a thick knife	Rarely — only for damage
Medium (the workhorse)	#800 – #1500	The actual sharpening: forms a fresh, keen edge. #1000 is the standard.	Every time you sharpen
Fine	#3000 – #6000	Polish and refine the edge; smoother push-cuts, cleaner slices	Optional — if you enjoy it
Ultra-fine	#8000 – #12000	Mirror finish, straight-razor / single-bevel work, hobby polishing	Almost never for kitchen use

03 · The one stone most people need: #1000

If you take one thing from this page: a single #1000 stone sharpens virtually any kitchen knife. The #1000 grit removes just enough steel to form a new edge without eating your blade, and the edge it leaves is genuinely sharp — not “good enough,” but sharp. In our own shop testing, the #1000 does roughly 80% of the total work; the coarse and fine stones only handle the edge cases at either end.

That’s why we tell nervous beginners to start with one #1000 and nothing else. It’s cheaper, it’s less to learn, and it removes the biggest beginner mistake — spending money and attention on a #8000 polishing stone before you can hold a steady angle. (If holding the angle is your worry, see our guide on what angle to sharpen at and how to hold it steady.)

04 · Which grit for your situation (quick reference)

Match the stone to the problem in front of you, not to a chart:

• Knife is chipped, or so dull it slides off a tomato: start on #200–#400 to rebuild the edge, then refine on #1000.
• Everyday “it’s just not sharp anymore”: a #1000 alone. This is 90% of home sharpening.
• You want a nicer, more polished edge: finish on #3000–#6000 after the #1000.
• Very hard or high-alloy steel that resists a normal stone: you may need a diamond plate instead — see whetstone or diamond?

05 · Recommended setups (what to actually buy)

Three sensible options, from “just get started” to “I’m into this now”:

1. One stone — #1000. The correct choice for most people. Sharpens everything; nothing to overthink.
2. Two stones — #1000 + #3000 (or #6000). The #1000 sharpens, the finer stone polishes. A great long-term kit for someone who has caught the bug.
3. Three stones — #400 + #1000 + #6000. Full coverage: repair, sharpen, polish. Only worth it if you sharpen often or maintain damaged blades.

Notice what’s not here: a #8000 or #12000 as a first or second stone. For kitchen knives, that’s polishing for its own sake. Buy it last, if ever.

06 · Important: “#1000” isn’t the same number everywhere

This is the part most guides skip, and it causes real confusion. Grit numbers follow different national standards: JIS (Japan), FEPA (Europe), ANSI/CAMI (USA), and microns (µm), which is the only true, physical measure of particle size.

Japanese water stones — including ours — are labeled in JIS. At coarse grits (around #220 and below) the standards roughly agree, but they diverge more and more as the numbers get finer. By the fine end the gap is large: a US/ANSI “600” is close to a European FEPA “P1200,” and US “1200” lands near FEPA “P2500.” In other words, a “1000-grit” sandpaper from the hardware store is not the same as a JIS #1000 water stone.

What to do about it, practically: compare stones within the same system (JIS to JIS), and if you ever need to compare across brands or against sandpaper, look at the micron rating if it’s printed. When we say #1000 on this site, we mean JIS #1000 — the everyday sharpening grit. You don’t need to memorize the conversions; you just need to know the number on the box depends on the standard.

07 · Common mistakes with grit

• Buying a #8000 first. A mirror polish on an edge you can’t yet hold steady is wasted. Master the #1000 first.
• Thinking higher grit = sharper. Sharpness comes from a clean apex and a removed burr, not from a big number. Higher grit = smoother, not sharper.
• Skipping the coarse stone on a chipped knife. Trying to grind out a chip on a #1000 takes forever and glazes the stone. Use a coarse stone for damage, then move up.
• Jumping too many grits at once. Going straight from #400 to #6000 leaves scratches the fine stone can’t erase efficiently. A #1000 in the middle bridges the gap.
• Ignoring flatness. Grit doesn’t matter if the stone is dished — keep it flat. If your knife won’t get sharp, the stone’s flatness is a common culprit — see why won’t my knife get sharp?

Frequently asked questions

What grit whetstone is best for kitchen knives?
#1000. It forms a genuinely sharp edge on any normal kitchen knife and does most of the work. Add a #3000–#6000 later only if you want a more polished finish.

Do I really need more than one grit?
No. One #1000 is enough to keep every knife in your kitchen sharp. Extra grits solve specific problems — coarse for damage, fine for polish — not everyday sharpening.

Is a higher grit whetstone sharper?
No. A higher grit gives a smoother, more refined edge, not a sharper one. A well-finished #1000 edge is already scary-sharp. Above about #6000 the difference is mostly aesthetic for kitchen use.

What grit removes a chip or fixes a very dull knife?
A coarse stone, #200–#400. It rebuilds the edge quickly. Then refine on #1000 so you’re not left with coarse scratches at the edge.

Why does my “1000-grit” sandpaper feel different from a #1000 stone?
Because they use different grit standards. Japanese stones use JIS; sandpaper often uses ANSI or FEPA, which diverge from JIS at finer grits. Compare within one system, or by microns, not by the raw number.

What grit for Japanese knives like a santoku or gyuto?
The same as any kitchen knife: a #1000 to sharpen, optionally a #3000–#6000 to polish. Japanese knives are often a touch harder, so keep your pressure light and let the stone do the work — see how to sharpen a Japanese knife.

The bottom line

Don’t let grit charts overwhelm you. Grit is just particle size: low cuts fast, high polishes. For the kitchen, one JIS #1000 stone does almost everything; add coarse only for damage and fine only for polish. Buy the #1000 first, learn to hold your angle, and you’ll out-sharpen most of the fancy multi-stone kits on the shelf.

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The stone to start with

If you’re buying one stone, make it a good #1000. Our ALTSTONE FUKAMI #1000 is the medium stone we reach for first — genuinely sharp results and all most home cooks ever need. Browse the full range in our stone collection.