The Santoku is one of the most popular Japanese knives: versatile, balanced, and precise. But its effectiveness depends directly on the quality of its edge. A dull Santoku loses all of its appeal. In this 2025 guide, discover how to sharpen a Japanese Santoku knife with the right method, which tools to use, and how to extend the life of your blades.
Why sharpen a Japanese Santoku knife regularly?
A demanding all-purpose knife
The Santoku is designed for chopping, slicing, and mincing. A poorly sharpened blade makes each motion more difficult, increases fatigue, and damages food.
Preserve the Japanese edge
Santoku knives are made from hard steel, often Damascus steel. This allows them to stay sharp for a long time, but it requires a specific sharpening technique.
Which tools should you use to sharpen a Japanese Santoku knife?
Japanese water stones
1000 grit → standard re-sharpening
3000 grit → finishing sharpening
8000 grit → polishing for a razor-sharp edge
The right sharpening angle
The Santoku is ideally sharpened at 12° to 15°. This finer angle than Western knives ensures clean, precise cutting.
Useful accessories
Angle guide to maintain consistency
Ceramic honing rod to maintain the edge between sharpenings
Leather or strop to polish and remove the burr
Step-by-step tutorial: how to sharpen a Santoku Japanese knife
Prepare the stone and the blade
Soak the stone for 10–15 minutes.
Keep the blade clean and slightly damp.
Carry out the sharpening
Place the blade on the stone at a 12–15° angle.
Use steady strokes, from the heel toward the tip.
Work first with 1000 grit, then move to 3000, then 8000.
Repeat on each side for balanced sharpening.
Remove the burr and test the cut
Run the blade over leather or a cloth to remove the burr.
Test the sharpness on a sheet of paper: the cut should be smooth and effortless.
Care after sharpening
Cleaning and drying
Carefully wipe your Santoku after sharpening to prevent corrosion.
Storage and protection
Store it in a sheath or on a magnetic block.
Avoid drawers, which can damage the edge.
Our Santoku Japanese knife recommendations
How do you sharpen a Japanese Santoku knife?
Which stone should be used to sharpen a Japanese Santoku knife?
Japanese water stones (1000, 3000, 8000) are ideal.
What angle should be used to sharpen a Japanese Santoku knife?
Between 12° and 15°, to preserve the fineness of the edge.
How often should a Japanese Santoku knife be sharpened?
Every 2 to 3 months depending on use.
Can a Santoku be sharpened with a standard honing steel?
No, choose a ceramic honing steel to avoid damaging the Japanese steel.
How can you test the sharpness after sharpening?
It should cut through a sheet of paper without resistance.
