What Does "Bevel" Actually Mean on a Kitchen Knife?
Pick up any kitchen knife and look at the blade edge-on. You'll notice the steel isn't just flat all the way down to the cutting edge. At some point near the bottom, the metal angles inward, narrowing to a thin line where the blade meets whatever you're cutting. That angled surface is the bevel.
More precisely, the bevel is the ground face (or faces) that taper the blade down to its cutting edge. Think of it like the slope of a roof: a steep roof sheds snow quickly, and a steep bevel creates a thin, acute edge that slices through food with minimal resistance. A more gradual slope is sturdier but won't cut as cleanly.
The number of bevels, their angles, and their shape all determine how a knife performs. Two knives made from identical steel, with identical hardness ratings, can behave completely differently based on how their edges are ground. This is why edge geometry matters at least as much as the steel itself.
The primary bevel (or primary grind) is the main taper of the blade from spine to edge. The secondary bevel is the narrow strip right at the cutting edge where the final sharpening angle is applied. When people say "double bevel" or "single bevel," they're usually referring to the secondary bevel and whether it's ground on one side or both.
Why Is Double Bevel the Standard for Most Kitchen Knives?
A double-bevel knife has its edge ground on both sides of the blade. If you were to look at a cross-section, you'd see a V shape (or something close to it) at the cutting edge, with steel removed symmetrically from both the left and right faces.
This is the default edge geometry for nearly every Western kitchen knife ever made, and it's also used on a huge number of Japanese-style knives. Your German chef's knife? Double bevel. A Japanese gyuto? Almost always double bevel. Santoku, nakiri, bunka, petty knives? Double bevel, the lot of them.
The typical angle on a double-bevel Western knife sits around 20 to 22 degrees per side, for a total included angle of about 40 to 44 degrees. Japanese double-bevel knives tend to run sharper, usually between 12 and 16 degrees per side, giving a total included angle of 24 to 32 degrees. That difference sounds small on paper, but the cutting feel is dramatically different. The Japanese geometry produces noticeably less resistance when you push the blade through dense vegetables or slice protein.
Symmetrical vs. Asymmetrical Double Bevels
Not all double bevels are ground equally on both sides. Many Japanese-style knives use what's called an asymmetrical double bevel, where one side is ground at a steeper angle than the other. A common ratio is 70/30 or 60/40, meaning about 70% of the material removal happens on the right face and 30% on the left. This biases the knife's cutting action slightly, giving it some of the precision benefits of a single-bevel knife while remaining usable for both left- and right-handed cooks.
If you've ever noticed a Japanese-style knife pulling slightly to one side while cutting, that asymmetry is why. It's not a defect. It's by design.
What Is a Single Bevel Knife and Who Should Use One?
A single-bevel knife is ground on only one side. The other side is either completely flat or very slightly concave (a feature called urasuki). Traditional Japanese-style knives like the yanagiba (sashimi slicer), usuba (vegetable knife), and deba (fish butchery knife) are all single-bevel designs.
The construction of a single-bevel knife is fundamentally different from a double-bevel one. Most traditional single-bevel Japanese-style knives are made from two layers of steel: a hard carbon steel cutting edge (hagane) forge-welded to a softer iron body (jigane). The hard steel only appears on the bevel side. This laminated construction allows the edge to be ground to extremely acute angles, often between 10 and 15 degrees on the one ground face, because the soft iron backing provides structural support.
That concave back (the urasuki) serves an important purpose. It reduces the contact area between the blade and the food, which minimizes friction and sticking. When a sushi chef draws a yanagiba through a block of tuna, the hollow back helps the fish release cleanly from the blade. The result is a mirror-smooth cut surface that preserves texture, appearance, and even taste.
Single-bevel knives are made specifically for right-handed or left-handed users. A right-handed yanagiba has the bevel on the right face. A left-handed version is the mirror image. You cannot simply flip a single-bevel knife and use it with the other hand. Left-handed single-bevel knives are produced in smaller quantities and typically cost more.
How Does Bevel Type Change the Way a Knife Cuts?
This is where things get interesting from a physics standpoint. The bevel geometry directly controls the path the blade takes through food.
A double-bevel knife pushes food apart equally on both sides as it cuts. The V-shaped edge acts like a wedge that splits material symmetrically. This makes double-bevel knives track in a straight vertical line, which is exactly what you want for general-purpose cutting: dicing onions, chopping herbs, breaking down a butternut squash.
A single-bevel knife behaves differently. Because only one side is angled, the blade creates an asymmetric wedge effect. The beveled side pushes food away from the blade while the flat side glides along the cut surface. For a right-handed knife, the food on the left separates and falls away while the right side stays flush against the remaining block. This is why single-bevel knives excel at precision slicing: the flat side acts as a reference plane, producing cuts of perfectly even thickness.
Try this mental experiment: imagine cutting paper-thin slices of cucumber for a salad garnish. With a double-bevel knife, each slice gets pushed equally from both sides, and very thin slices tend to curl or tear. With a single-bevel usuba, the flat back rides along the cucumber and the bevel pushes only the cut slice away. The result is a cleaner, thinner, more consistent cut.
That said, single-bevel knives are harder to control for general cutting. They naturally steer toward the bevel side, which takes practice to compensate for. If you've never used one, your first experience will probably involve a lot of diagonal cuts when you intended to go straight down.
What Are Grind Profiles and How Do They Affect Cutting?
The bevel type (single or double) tells you how many sides are ground. The grind profile tells you the shape of that grind. Here are the four most common profiles you'll encounter on kitchen knives:
| Grind Type | Shape | Common On | Characteristics |
|---|---|---|---|
| Flat (V-grind) | Straight lines from spine to edge | Most Japanese-style knives, many Western knives | Good balance of sharpness and durability. Easy to resharpen on a whetstone. |
| Convex | Outward curve from spine to edge | High-end Japanese-style knives, axes, cleavers | Strongest edge geometry. Excellent food release because the curved surface pushes food away. Harder to sharpen precisely. |
| Hollow | Inward (concave) curve from spine to edge | Some Western knives, straight razors | Creates an extremely thin, sharp edge. Fragile. Good for delicate slicing but chips easily on hard foods. |
| Scandi | Single flat bevel all the way to the edge (no secondary bevel) | Bushcraft knives, some traditional tools | Very easy to sharpen in the field. Rarely seen on kitchen knives. The flat bevel acts as its own sharpening guide. |
Most quality kitchen knives use either a flat or convex grind. Hollow grinds show up occasionally on slicing knives designed for soft proteins, but they're uncommon in a home kitchen context. Scandi grinds belong to the outdoor and woodworking world and aren't practical for food prep.
Which Bevel Type Should You Use for Which Task?
The choice between single and double bevel comes down to what you're cutting and how much precision you need.
Double bevel is the right choice for:
- General-purpose cutting, chopping, and dicing
- Rock-chopping herbs (the rocking motion requires even pressure on both sides)
- Breaking down large vegetables like cabbage, squash, and root vegetables
- Butchery and portioning where you need straight, controlled cuts
- Any task where the knife needs to track in a straight vertical line
- Cooks who switch hands or share knives with others
Single bevel excels at:
- Sashimi and sushi preparation (long, single-pull draw cuts)
- Paper-thin vegetable slicing (katsuramuki, the rotary peeling technique)
- Fish fabrication and filleting where the flat back follows the bone structure
- Any task that demands extremely precise thickness control
- Presentation-quality cuts where the surface finish of each slice matters
Why Should Most Home Cooks Stick with Double Bevel Knives?
I want to be direct about this: unless you're regularly preparing sashimi or doing high-volume Japanese vegetable work, a double-bevel knife will serve you better in almost every situation.
Single-bevel knives require significantly more skill to use and maintain. Sharpening them properly means understanding how to work the flat back (keeping it truly flat while removing the burr) and maintaining the correct angle on the beveled side. Mess up the back and you'll introduce a secondary bevel where there shouldn't be one, which ruins the knife's cutting geometry.
They're also more fragile. That acute single-side edge is ground to a very thin angle, which makes it prone to chipping if you hit a bone, a cutting board at the wrong angle, or a hard vegetable like a raw sweet potato. Single-bevel knives are purpose-built tools, not all-rounders.
A well-made Japanese double-bevel knife ground at 12 to 15 degrees per side will give you exceptional sharpness, clean cuts, and the versatility to handle everything from morning fruit prep to evening dinner service. You can sharpen it on a standard whetstone without needing specialised technique. And both right- and left-handed cooks can use it interchangeably.
If you do want to explore single-bevel knives, start with a yanagiba for fish work and treat it as a specialty tool rather than a daily driver.
When sharpening, always match the existing bevel angle rather than imposing a new one. For most double-bevel Japanese-style knives, that's 12 to 16 degrees per side. For Western knives, 18 to 22 degrees per side. Changing the angle changes the knife's behaviour and can compromise the steel's performance. Our knife sharpening angle guide covers this in detail.
What Edge Geometry Do Xinzuo Knives Use?
Every XINZUO kitchen knife ships with a double-bevel edge. This is a deliberate choice. We design our knives for home cooks and professional chefs who need versatile, high-performance tools that work across a full range of kitchen tasks.
XINZUO blades are ground to approximately 12 to 15 degrees per side, putting them firmly in the Japanese sharpness range while maintaining the usability and ambidextrous nature of a double-bevel design. The result is a knife that cuts with the precision you'd expect from Japanese craftsmanship but doesn't require specialised single-bevel maintenance skills.
The steel matters here too. XINZUO uses high-carbon steels like 10Cr15CoMoV and composite Damascus with VG-10 or SG2 powder steel cores. These steels can be hardened to 60+ HRC, which means they hold that acute 12 to 15 degree edge angle without rolling or deforming the way softer Western steels would at the same angle. You get the best of both worlds: Japanese-style sharpness in a format that any cook can use and maintain.
The blade profiles also feature a slight convexity behind the edge on many models. This micro-convex geometry strengthens the edge while maintaining excellent food release. Dense root vegetables and starchy potatoes slide off the blade instead of sticking, which is a common frustration with extremely thin, flat-ground edges.
Related Reading
If you want to go deeper on knife edges, steel, and sharpening, these guides cover the specifics:
- Knife Sharpening Angle Guide , how to find and maintain the correct angle for your knife
- How to Sharpen Knives with a Whetstone , step-by-step whetstone technique for double-bevel edges
- Honing Steel Guide , the difference between honing and sharpening, and when to use each
- German vs Japanese-style Kitchen Knives , how Western and Japanese design philosophies produce different edge geometries
- Japanese-style Knife Types Explained , a guide to traditional Japanese-style knife shapes, including single-bevel designs
- Knife Steel Hardness Guide , why harder steel allows sharper, more acute edge angles
- Sashimi Knife Buying Guide , what to look for in a single-bevel slicing knife
- How to Choose a Chef Knife , the complete buying guide covering edge geometry, steel, and handle design
Frequently Asked Questions
What is the difference between a single bevel and double bevel knife?
A double bevel knife is sharpened on both sides of the blade, forming a V-shaped edge. A single bevel knife is sharpened on only one side, with the other side flat or slightly concave. Double bevel is the standard for almost all Western and most Japanese-style kitchen knives. Single bevel is used on traditional Japanese speciality knives like the yanagiba, usuba, and deba, which are designed for precision tasks like sashimi slicing and fish fabrication.
Why does a single bevel knife pull to one side when cutting?
Because the wedge effect is asymmetric. The bevelled side pushes food away from the blade while the flat side glides along the cut surface, creating a steering force toward the bevel side. This is intentional. In sashimi preparation, the flat back acts as a reference plane so the chef can produce slices of perfectly even thickness. It takes practice to compensate for the drift during general cutting, which is one reason single bevel knives are not recommended for beginners.
What is an asymmetrical double bevel knife?
An asymmetrical (or 70/30) double bevel has both sides sharpened but at different ratios, with more material removed from one side than the other. Many Japanese-style kitchen knives use this grind to give some of the steering precision of a single bevel while remaining usable for both left- and right-handed cooks. If your Japanese-style knife pulls slightly to one side during straight cuts, the asymmetric grind is why.
What is a convex grind on a kitchen knife?
A convex grind curves gently outward from the spine to the edge, carrying more steel behind the cutting edge than a flat V-grind. This extra material makes the edge stronger and more resistant to chipping, while the rounded surface pushes food away from the blade, reducing sticking. Some Xinzuo models use a micro-convex profile behind the edge for exactly this reason. Convex grinds are harder to sharpen on a flat whetstone because you need to roll the blade slightly through the stroke.
Are single bevel knives harder to sharpen than double bevel?
Yes. Single bevel sharpening requires maintaining the bevel angle on the ground side (10 to 15 degrees) and keeping the back face completely flat, including the concave hollow (urasuki) near the edge. If you accidentally create a secondary bevel on the flat side, the knife loses its precision cutting geometry. Double bevel knives are far more forgiving because you simply match the same angle on both sides.