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Hone & Handle

Japanese Knives

Japanese Knife Sizes

Length is decided by your board, not by how serious a cook you are. Measure first.

By Michael W. · Published September 29, 2026

A notebook and kitchen tools laid out on a counter

Hone & Handle earns a commission from qualifying purchases made through links on this page, at no extra cost to you. It does not change what we recommend or the order we rank things in — here is how we choose and here is the full disclosure.

What this is based on: published manufacturer specifications and retailer listings, cited on each product; the weight of professional and owner reviews across multiple retailers; and hands-on experience sharpening and cooking with knives of this type. We have not individually tested every model listed, we do not run instrumented sharpness testing, and we do not claim a test we did not run.

Quick picks

#ProductBest forScorePrice
1
A thin-bladed Japanese chef's knife slicing vegetables on a wooden board
Tojiro DP Gyuto 210mm (F-808)The default answer to 'my first real Japanese knife'. VG-10 at around 60 HRC in a plain three-layer build, at a price that makes the inevitable first chip survivable.
First Japanese knife8.6out of 10
2
A home cook chopping on a board with a thin-bladed chef's knife
MAC Professional 8" Chef's Knife with Dimples (MTH-80)The knife that wins the most side-by-side tests and asks the least of you. Thin, light, 61 HRC, and forgiving enough that a mediocre sharpening job still cuts well.
The one-knife kitchen8.8out of 10
3
A thin-bladed kitchen knife slicing produce on a board
MAC Professional 6.5" Santoku (MSK-65)The MTH-80's logic in a santoku: thin, light, 15 degrees per side, and consistent from unit to unit.
Precision vegetable work8.5out of 10

Scores are our own editorial judgment on the rubric published at our methodology page, weighing edge and steel, geometry, handle, value. They are not measurements and they are not user ratings.

Go and measure your cutting board. That number decides your knife length, and almost nothing else does.

Lengths, in both systems

Japanese knife lengths and their Western equivalents
MetricImperialCommon onSuits
120mm4.7 inPettySmall board work
150mm5.9 inPetty, small santokuTrimming, segmenting
165mm6.5 inSantoku, nakiriThe standard for both
180mm7.1 inShort gyuto, long santokuSmall kitchens, small hands
210mm8.3 inGyutoThe home default
240mm9.4 inGyuto, sujihikiLarge boards, volume prep
270mm10.6 inGyuto, sujihiki, yanagibaProfessional line work

Why a 210mm knife is not always 8.3 inches

Japanese makers quote the cutting edge. Western makers often quote the blade including the part that disappears into the bolster. That is why a Tojiro DP listed as 210mm measures about 8.3 inches of edge, while a Wüsthof "8-inch" is 200mm — the Wüsthof is slightly the shorter knife despite the larger-sounding number.

Individual units also vary. The same Tojiro 210mm model is listed by different retailers at 210mm and 213mm of edge. A few millimeters either way changes nothing in use.

The measurement that matters

  1. Measure the usable length of your board — the flat area, not including any juice groove or raised lip.
  2. Subtract about four inches for the food you are cutting and the hand holding it.
  3. That is your working length. If it is under 9 inches, a 240mm knife will be fighting you.

The quick version

Board 12–15 inches: 165–180mm. Board 15–18 inches: 210mm. Board 18 inches or more: 210mm or 240mm, your preference. If you want a bigger knife, the cheaper fix is usually a bigger board.

Height matters too

Blade height at the heel determines knuckle clearance. A 210mm gyuto is typically 43 to 47mm tall; a nakiri is around 45 to 50mm. Below about 40mm your knuckles start catching the board in a pinch grip, which is why a very long thin slicer is uncomfortable for general prep even though it is plenty long enough.

The verdict

210mm gyuto, unless your board tells you otherwise. The Tojiro DP F-808 and the MAC MTH-80 are both in that class and both are on the gyuto roundup. If your board is genuinely small, the MAC MSK-65 santoku at 6.5 inches is the honest alternative.

The picks in detail

#1 · First Japanese knife

Tojiro DP Gyuto 210mm (F-808)

The default answer to 'my first real Japanese knife'. VG-10 at around 60 HRC in a plain three-layer build, at a price that makes the inevitable first chip survivable.

Edge & steel8.5
Geometry8.0
Handle6.0
Value9.5
8.6overall, out of 10

What it does well

  • VG-10 at 59-60 HRC takes a genuinely fine edge and holds it far longer than a German knife at 56-58
  • 1.9 mm spine and 43 mm heel make it thin behind the edge without being fragile
  • Cheap enough that learning to sharpen on it is not frightening

Where it gives way

  • Handle finish is functional and unlovely; some units need the bolster easing with sandpaper
  • Stainless cladding is soft and scratches readily
  • Nothing about the fit and finish will impress anyone

Skip it if: Anyone who wants the knife to be beautiful. The handle is a workmanlike composite with a stainless bolster and nothing about it is charming.

Published specifications for Tojiro DP Gyuto 210mm (F-808)
Blade length210 mm (8.3 in)
SteelVG-10 core, 13-chrome stainless cladding (san mai)
Hardness59-60 HRC
Heel height43 mm
Spine at heel1.9 mm
Weightapprox. 187 g
HandleWestern, laminated composite wood with stainless bolster

Specifications read from Knivesandstones — Tojiro DP3 Gyuto 210mm F-808 specifications.

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A thin-bladed Japanese chef's knife slicing vegetables on a wooden board

#2 · The one-knife kitchen

MAC Professional 8" Chef's Knife with Dimples (MTH-80)

The knife that wins the most side-by-side tests and asks the least of you. Thin, light, 61 HRC, and forgiving enough that a mediocre sharpening job still cuts well.

Edge & steel8.5
Geometry9.0
Handle8.0
Value7.5
8.8overall, out of 10

What it does well

  • 6.8 oz with a 2.5 mm spine — genuinely light in the hand over a long prep session
  • 15 degrees per side from the factory, which is the angle you will maintain anyway
  • 25-year warranty and a reputation for consistency unit to unit

Where it gives way

  • Costs meaningfully more than a Tojiro DP for a similar hardness
  • Mono-steel, so no cladding to protect the core if you drop it edge-first
  • The dimples do less for release than the marketing implies

Skip it if: Anyone chasing maximum edge retention. At 61 HRC in a mono-steel it will not out-last a powder-steel blade, and the dimples are cosmetic more often than useful.

Published specifications for MAC Professional 8" Chef's Knife with Dimples (MTH-80)
Blade length8 in (approx. 200 mm)
SteelSub-zero tempered high-carbon molybdenum vanadium alloy
Hardness61 HRC
Edge angle15 degrees per side (double bevel)
Blade height1 7/8 in
Spine at heel2.5 mm
Weight6.8 oz
HandleRiveted Pakkawood with integrated bolster

Specifications read from Cutlery and More — MAC Professional MTH-80 specifications.

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A home cook chopping on a board with a thin-bladed chef's knife

#3 · Precision vegetable work

MAC Professional 6.5" Santoku (MSK-65)

The MTH-80's logic in a santoku: thin, light, 15 degrees per side, and consistent from unit to unit.

Edge & steel8.5
Geometry9.0
Handle7.5
Value7.5
8.5overall, out of 10

What it does well

  • Extremely thin behind the edge for its price
  • Same 15-degree factory geometry as the rest of the Professional line
  • Light and neutral in the hand

Where it gives way

  • Thin tip is easy to damage
  • No bolster to protect your knuckles in a heavy grip
  • Costs more than the Tojiro equivalent

Skip it if: Heavy jobs. It is thin, and thin blades dislike bone and frozen food.

Published specifications for MAC Professional 6.5" Santoku (MSK-65)
Blade length6.5 in
SteelSub-zero tempered high-carbon molybdenum vanadium alloy
Hardnessapprox. 61 HRC (MAC Professional line)
Edge angle15 degrees per side

Specifications read from Cutlery and More — MAC Professional line specifications.

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A thin-bladed kitchen knife slicing produce on a board

Common questions

What size gyuto should I buy — 210mm or 240mm?

210mm for home kitchens, which is about 8.3 inches. 240mm assumes a board 18 inches or longer and a lot of counter clearance; on a standard home board the tip overhangs and you stop using the front third of the blade. Measure your board before you decide — that measurement, not your height, is what settles it.

Why are Japanese knives measured in millimeters?

Because Japanese makers measure them that way, and the numbers are of the cutting edge rather than the whole blade. That is why a 210mm gyuto is often listed as 8.2 or 8.3 inches while a Western '8-inch' chef's knife is 200mm — the measuring conventions differ slightly between traditions.

Is a bigger knife harder to control?

Not inherently — but a knife that overhangs your board is. Control problems at home are almost always a board-size problem dressed up as a knife-size problem.

What length nakiri or santoku should I get?

165 to 170mm for both. That is the standard and there is very little reason to deviate. Below 160mm you cannot handle a cabbage; above 180mm a santoku starts duplicating a short gyuto.

Sources

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