What Is a Petty Knife? The Small Japanese Blade You'll Reach for Constantly
Most people buy a gyuto or a santoku first, and they're right to. But ask a cook which knife they actually pick up the most, and a surprising number will point to something smaller: the petty. It's the blade that lives in the gap between a tiny paring knife and a full-size chef's knife, and once you have a good one, it rarely goes back in the drawer.
This guide covers what a petty knife is, what it's for, how it differs from a paring knife, and what size to look for, so you can decide whether it belongs in your kit.
What is a petty knife?
A petty is a small, nimble Japanese utility knife, typically 120mm to 150mm long, with a pointed tip and a slim profile. The name comes from the French petit, and like the gyuto, it emerged as Japan adapted Western kitchen tools. Think of it as a scaled-down chef's knife: long enough to do real cutting work, small enough for precision and control in the hand.
It bridges the gap between a paring knife, which is built for in-hand work on small items, and a gyuto, which can feel like too much knife for delicate jobs. That middle ground turns out to be where a lot of everyday cooking actually happens.
What is a petty knife used for?
The petty shines at the tasks that are too fiddly for a big knife but too involved for a paring knife:
- Precision work on a board: slicing shallots, mincing garlic and herbs, trimming mushrooms, segmenting citrus.
- Detail and finesse: deveining shrimp, hulling strawberries, trimming fat, removing seeds and cores.
- In-hand cutting: peeling and shaping where you'd otherwise reach for a paring knife, but with more reach.
- Small proteins and fruit: portioning, slicing, and tidying jobs that don't justify a full gyuto.
It's the knife you grab when you don't want to grab the big knife, which, for a lot of cooks, is most of the time.
Petty vs. paring knife: what's the difference?
They overlap, but they're built for different things. A paring knife is short, usually around 75mm to 90mm, and designed mainly for in-hand work: peeling an apple, hulling a strawberry, small precise cuts done off the board. A petty is longer and just as comfortable on the cutting board as in the hand, so it handles everything a paring knife does plus a good share of light board work a paring knife is too short for.
If you already own a paring knife and want one more small blade, a petty is the more versatile pick. If you only do tiny in-hand tasks, a paring knife is enough. Many cooks keep both, but if you're choosing one, the petty does more.
What size petty should you buy?
Petty knives generally run from 120mm to 150mm, and the right size depends on what you want it to do:
- 120mm is nimble and ideal for fine detail and in-hand work, leaning closer to a paring knife with more reach.
- 150mm is the more versatile all-rounder, comfortable on the board for slicing and mincing while still precise. For most cooks adding a first petty, 150mm is the sweet spot.
Does a petty replace a chef's knife?
No, and it isn't meant to. The petty is a complement, not a substitute. You'll still want a gyuto or santoku for breaking down larger vegetables and proteins and for long slicing strokes. The petty handles everything those knives are too big for. A gyuto and a petty together cover the vast majority of home cooking: one for the heavy lifting, one for the finesse.
If you're still sorting out your main knife, start with our guide to gyuto vs. santoku, then add a petty as your second blade. For the full range of shapes, see our Japanese knife style guide.
Frequently asked questions
What is a petty knife best for?
A petty is best for precision tasks that fall between a paring knife and a chef's knife: slicing shallots, mincing herbs and garlic, trimming, deveining shrimp, segmenting citrus, and detail work both on the board and in the hand.
Is a petty knife the same as a utility knife?
Essentially, yes. The petty is the Japanese version of a Western utility knife, a small, pointed, all-purpose blade for tasks too fine for a chef's knife and too large for a paring knife.
Should I get a petty or a paring knife?
If you want one versatile small knife, choose a petty; it does board work and in-hand work. A paring knife is better only if you exclusively do small in-hand tasks like peeling. Many cooks own both.
What size petty knife is most versatile?
A 150mm petty is the most versatile all-around size, comfortable on the cutting board while still precise. A 120mm is better if you mainly want fine detail and in-hand control.
Do I need a petty if I already have a gyuto?
You don't need one, but it's the most natural second knife. A gyuto and a petty together cover most cooking: the gyuto for larger work, the petty for the small, precise tasks a big knife handles awkwardly.
Coutelier curates hand-forged Japanese petty, gyuto, santoku, and specialty knives from master Japanese makers, and offers traditional whetstone sharpening. Visit us on Oak Street in New Orleans. Free U.S. shipping on orders over $250.