The sharpening angle of a knife directly determines the fineness of the cut, the edge retention, and how the knife feels on food. A lower angle creates a very fine, precise edge; a higher angle reinforces the blade edge more strongly.
For Maison Damas Damascus Japanese knives, the reference to keep in mind is simple: 15° on each side of the blade. On a symmetrical double-bevel knife, this corresponds to a total edge angle of 30°. This distinction matters, because when a manufacturer indicates “15°,” it usually refers to the angle between one bevel side and the sharpening stone, not the total edge angle.
Why is the sharpening angle so important?
Sharpening a knife means working the bevel until you reform an edge that is fine and even enough to cut cleanly. The chosen angle determines the amount of steel located immediately behind that edge.
With a reduced angle, such as 15°, the blade penetrates food more easily. Cutting vegetables, fish, or meat requires less effort and becomes more precise. This is one of the reasons why Damascus steel Japanese knives are appreciated for kitchen tasks that require a fine edge.
By contrast, a more open angle leaves more material behind the edge. The knife loses a little cutting finesse, but generally withstands greater stress better. There is therefore no ideal angle for all knives: blade geometry, steel hardness, and especially intended use must all be taken into account.
Which angle should you choose according to the type of knife?
The following values are guidelines. The original angle indicated by the manufacturer remains the best reference, because two knives of the same origin can have different geometry.
| Knife type | Indicative angle per side | Desired characteristic |
|---|---|---|
| Maison Damas Japanese knife | 15° | Fine, clean, precise cutting |
| Japanese kitchen knife | About 10 to 16° depending on the model | Very fine cutting performance |
| European kitchen knife | About 15 to 20° depending on the manufacturer | Balance between cutting performance and robustness |
| Hunting or outdoor knife | About 20 to 25° | More durable edge |
| Blade intended for heavy-duty tasks | 20 to 30° depending on its design | Resistance to stress |
It is also important to distinguish double-bevel Japanese knives from traditional single-bevel blades. On the latter, sharpening is asymmetrical and should not be replicated identically on both sides.
What is the difference between a 15° angle and a 20° angle?
The difference of five degrees may seem small on paper, but it genuinely changes the knife’s behavior.
- At 15° per side: the bevel is finer. The knife penetrates food easily and is particularly suited to precise cuts.
- At 20° per side: The edge benefits from more material and gains in strength, at the expense of a slightly less refined cut.
It would therefore be counterproductive to systematically sharpen a knife designed for 15° at 20°. Over successive sharpenings, its geometry would change and part of the desired cutting feel would be lost. For an Akashi santoku knife, for example, it is advisable to keep the original 15° sharpening angle on each side.
Conversely, greatly reducing the angle of a blade initially intended to be sharpened at 20° can make its edge too fragile for its steel or its intended use. Reprofiling a blade is possible, but it is a different operation from simple maintenance.
How do you sharpen a Japanese knife at 15° on a whetstone?
The whetstone remains one of the most precise tools for controlling the bevel and removing only the amount of steel needed. A 1000/6000 sharpening stone, for example, allows you to use a 1000 grit to restore the edge, then a 6000 grit to refine and polish the cutting edge.
1. Prepare the stone and observe the bevel
Place the stone on a perfectly stable surface and prepare it according to the instructions provided for the model used. Before starting, observe the width of the existing bevel. The goal of routine maintenance is not to create a new angle, but to follow the one already present.
One tip is to lightly color the bevel with a marker. After two or three passes on the stone, observe the removed area: if the entire colored surface has disappeared evenly, your angle is close to the original bevel.
2. Position the blade at 15°
Place the knife edge on the stone, then gradually raise the spine of the blade until you reach approximately 15°. To visualize this tilt, you can use an angle guide or estimate it based on the blade height.
As a geometric reference, on a blade about 50 mm high, an angle of 15° corresponds to a spine positioned approximately 13 mm above the stone surface. This calculation is only a guide: once the motion has begun, the consistency of the angle matters more than millimeter-level precision.
3. Work along the full length of the cutting edge
Slide the blade across the stone with a controlled motion, from heel to tip. Maintain the same tilt from start to finish and avoid pressing too hard. Excessive pressure does not necessarily speed up sharpening and makes it harder to control the angle.
Work gradually across the different sections of the blade. When you feel a slight burr appearing on the other side of the edge, switch to the second side and repeat the process.
4. Gradually reduce the pressure
Once the edge has been reformed, alternate sides and gradually reduce the pressure. If you use a multi-grit stone, then move to the fine surface to achieve a cleaner finish and remove the last irregularities from the edge.
The goal is not to multiply the strokes, but to obtain a homogeneous bevel לאורך the full length.
How do you maintain a constant angle while sharpening?
This is often the main difficulty for a beginner. The hand naturally tends to move up or down during the motion, which gradually rounds the bevel.
A few habits make the work much easier:
- lock the wrist and move mainly the arms;
- make slow movements before looking for speed;
- regularly check the bevel using the marker technique;
- use the full surface of the stone to limit uneven wear;
- use a suitable guide when you still lack reference points.
Some Japanese knife accessories can also make maintenance easier. Be careful, however, with sharpeners that have a preset angle: they should only be used if their geometry matches that of your knife.
Stone, honing rod, or sharpener: which tool should you choose?
These tools do not serve exactly the same purpose. An abrasive stone allows you to work the bevel precisely and recreate a true cutting edge. It is the most versatile option for carrying out a complete sharpening.
The honing rod is mainly used to maintain or realign the edge between two sharpenings, depending on its material and abrasiveness. On hard Japanese steels, it is best to use a suitable tool and work without impact or excessive pressure.
A guided sharpener is easier to get started with, because it helps maintain a constant angle. Its main drawback appears when the imposed angle does not match the knife: a system set only to 20° is not suitable for a blade you want to keep at 15°.
What happens if the sharpening angle is wrong?
A one-time mistake does not immediately ruin a blade, but repeated sharpening at the wrong angle eventually changes its geometry.
- Angle too low: the edge becomes very fine but may lose strength and chip more easily depending on the steel and use.
- Angle too high: the cutting edge gains durability, but the blade penetrates food less easily.
- Uneven angle: the bevel rounds off, the edge becomes less precise, and sharpening requires more passes.
- Excessive pressure: unnecessary steel is removed and blade wear accelerates.
A well-maintained knife should above all preserve the geometry intended in its design. If you are still hesitating between several blade shapes, our guide to the best kitchen knives also helps you understand the differences between a chef knife, santoku, nakiri, paring knife, and bread knife.
Which angle should you use in practice?
For a knife whose characteristics you know, keep the original angle whenever possible. It is the safest way to preserve the balance between cutting finesse and durability intended for the blade.
For Maison Damas Damascus Japanese knives, therefore keep 15° on each side . For a European knife or another brand, check the manufacturer’s recommendations rather than automatically assuming it should be sharpened at 20°. Modern steels, heat treatments, and geometries vary enough that a universal figure does not really make sense.
Finally, it is better to perform light, regular maintenance than to wait until the knife is completely dull. A few controlled passes at the correct angle remove less material and help preserve the edge much longer.
FAQ on a knife’s sharpening angle
Does 15° correspond to the total edge angle?
No, when Maison Damas indicates 15° for its double-bevel Damascus Japanese knives, that means 15° on each side. The edge therefore forms a total angle of about 30°.
Can a 20° sharpener be used on a knife sharpened to 15°?
It is not recommended if you want to preserve its original geometry. Repeated passes at 20° would gradually create a new, wider bevel and change the cutting feel.
How can I tell if I am really holding my knife at 15°?
An angle guide is the simplest solution. You can also color the bevel with a marker: if the stone removes the color evenly across its full width, your position is close to the existing angle.
Can a 20° angle be turned into a 15° angle?
Yes, technically, but this is re-profiling rather than simple sharpening. The process removes more material, and the new angle must remain compatible with the steel’s hardness and the knife’s intended use.
How often should a knife be sharpened?
There is no fixed frequency. Sharpen when the blade starts slipping on the skin of a tomato, crushes certain foods, or requires more pressure. Light maintenance performed at the right time removes less steel than late, intensive sharpening.
Which grit stone should be used to maintain a knife?
An intermediate grit around 1000 works well to restore a dull edge. A much finer grit, such as 6000, is then used to refine and polish the edge. A very damaged blade may first require coarser work.
Is a serrated knife also sharpened at 15°?
Not with the same method as a smooth blade. Serrations have a specific geometry and generally require a suitable tool or sharpening done tooth by tooth. You should therefore not automatically apply the stone method used for a santoku or a chef knife.