Santoku vs Petty Knife: Sizes, Uses and Which to Buy

Santoku vs petty knife: the santoku is a wide 179mm all-rounder for boards of vegetables, meat and fish, while the petty is a slim 127mm blade for detail work in the hand. Most kitchens need the santoku first and the petty second.

They look like the same knife shrunk down. They are not. The santoku and the petty come from the same Japanese workshop tradition, they share a grind philosophy, and they sit next to each other in almost every Japanese knife roll — but they are built for opposite halves of the job. One works on the board. One works in your hand.

This guide sets the two side by side on measurements, on the cuts each one actually does well, and on the order to buy them in. It also settles the question the search results keep confusing: whether a petty knife is just a paring knife with a Japanese name.

Santoku vs petty knife at a glance

Here are the numbers from our own Dynasty Series pair, which is the cleanest comparison available because both blades are ground to the same philosophy:

• Santoku — 179mm blade, 50mm at its tallest point, 125mm handle. A flat edge profile with a rounded sheepsfoot tip.
• Petty — 127mm blade, 27mm tall, 2mm thick at the spine, 105mm handle. A gently curved edge running to a fine point.

The number that decides everything is blade height. At 50mm the santoku gives you knuckle clearance over the board and a face wide enough to scoop what you have cut. At 27mm the petty gives you none of that, and gains the ability to work off the board entirely — in your palm, around a bone, inside a pepper.

What is a petty knife?

A petty knife is the Japanese small utility knife: roughly 100mm to 150mm of blade, slim, pointed, and meant to be held rather than set down. The name comes from the French petit, which is a clue to its history — it is the Japanese answer to the Western utility knife rather than a traditional Japanese shape.

Its job is the class of work that is too fiddly for a chef knife and too large for a paring knife. Segmenting citrus. Deveining prawns. Trimming silverskin off a tenderloin. Slicing shallots in the hand while a pan is going. Lifting the stem out of a tomato without quartering it first.

People buy the petty last and reach for it first — that pattern shows up in our own order data often enough to be worth saying out loud.

Is a petty knife the same as a paring knife?

No, and this is the most common mix-up in the category. A paring knife is 80mm to 100mm and built for peeling — a short, stiff, highly controllable blade you use with your thumb braced on the food. A petty is 120mm to 150mm and built for cutting. The extra length means it can slice a shallot end to end or break down a chicken thigh, which a paring knife physically cannot reach across.

Put practically: if the food is in your hand and you are removing skin, you want a paring knife. If the food is in your hand and you are cutting through it, you want a petty. If you want one knife to do both jobs adequately, buy the petty — it is the more versatile of the two, and it is why it earns the name utility.

What the santoku is actually for

Santoku means "three virtues", usually read as meat, fish and vegetables. The shape is a compromise engineered on purpose: shorter and lighter than a gyuto, taller and flatter than a Western chef knife.

That flat edge is the point. A santoku is a push-cutting and chopping knife, not a rocking knife. You lift and drop it, the whole edge meets the board at once, and a board of onions goes down fast without the back-and-forth motion a curved French profile needs. Cooks who find a chef knife unwieldy usually find a santoku immediately comfortable, because it asks for less wrist and less reach.

For the shape on its own — bevels, sizes, care — read our Santoku Knife Guide.

Which one should you buy first?

Buy the santoku first. It is a primary knife: it can be the only blade on your board and get a full dinner done. The petty is a secondary knife by design — brilliant at what it does, but it cannot break down a cabbage or slice a roast.

The exception is the household that already owns a working chef knife. If your 8-inch is sharp and you like it, a santoku is a comfort upgrade rather than a capability one, and the petty is the blade that will actually change what you can do. That is the gap in most knife blocks.

Our santoku and petty options

Every blade below is hand forged, then hand sharpened and oiled before it ships.

• Silver Dynasty 7" Santoku — 67-layer mirror-polished Damascus over a cobalt-enriched 10Cr15CoMoV core at 60 ±2 HRC, full tang, olive wood burl handle.
• Damascus Dynasty 7" Santoku — the same geometry in black forged 67-layer Damascus with a black walnut handle.
• Dynasty Series Santoku — the original of the pair, the 179mm blade the measurements above are taken from.
• Torii 6" Petty Knife — 7Cr17MoV high carbon steel, hammer forged, sized at the long end of the petty range so it doubles as a small slicer.
• Torii Kiritsuke & Petty Duo — the petty paired with a kiritsuke, which is the two-knife setup this whole comparison points at.

Shop the range: Japanese Chef Knives — the sharpest blades you will ever use or your money back, backed by a 99-day home trial and a free lifetime guarantee.

Where the gyuto and nakiri fit

People searching santoku against petty are usually mapping the whole Japanese line-up, so briefly: the gyuto is the long all-rounder, 210mm and up, the direct counterpart to a Western chef knife. The nakiri is the tall rectangular vegetable knife — flatter and taller than a santoku, and no tip to speak of. The santoku sits between gyuto and nakiri. The petty sits below all of them.

Read our Japanese Chef Knife Guide for the full line-up, What Is a Nakiri Knife Used For? for the vegetable specialist, and the Kitchen Utility Knife guide for the Western equivalent of the petty.

Care for both

Hand wash and dry immediately — no dishwasher, on either. Store on a magnetic rack or in a saya rather than loose in a drawer, because the petty's fine tip is the first thing to go. Hone before long jobs, and sharpen on a whetstone when the edge stops biting paper.

Is a santoku better than a chef knife?

Not better, different. A santoku is shorter, lighter and flatter, which suits push cutting and smaller boards. A chef knife's curved belly suits rocking and gives more reach on large cuts. Pick by cutting style, not by which is newer in your kitchen.

What size petty knife should I get?

150mm if you want one knife to cover everything between paring and chef work, 120mm if you mainly want in-hand detail control. Our 6-inch sits at the versatile end of that range.

Can a petty knife replace a santoku?

No. The petty has neither the height for knuckle clearance nor the length to cross a large vegetable. It complements a santoku; it does not substitute for one.

Which is easier for a beginner?

The santoku. It is forgiving, it does not need a learned rocking motion, and its rounded tip is harder to catch. The petty rewards a confident pinch grip, which takes a little practice.