Knife Sharpening Angle Guide
Find the correct sharpening angle for any knife type — kitchen, hunting, pocket, and Japanese knives.
Calculate the edge bevel and spine height for your whetstone.
Knife sharpening angle is the angle between the blade and the sharpening surface. The angle determines how sharp and how durable the edge will be.
Lower angle = sharper but more fragile Higher angle = less sharp but more durable
Recommended angles by knife type:
| Knife Type | Angle Per Side | Total Included Angle |
|---|---|---|
| Japanese kitchen knives (single bevel) | 10–15° | 10–15° total |
| Japanese kitchen knives (double bevel) | 15° | 30° total |
| Western kitchen knives (chef’s knife) | 17–20° | 34–40° total |
| Pocket / folding knives | 20–25° | 40–50° total |
| Hunting / outdoor knives | 22–25° | 44–50° total |
| Tactical / combat knives | 25–30° | 50–60° total |
| Axes and hatchets | 25–30° | 50–60° total |
| Scissors | 45° (single edge) | — |
| Straight razors | 7° | 14° total |
| Filet / boning knives | 12–15° | 24–30° total |
How to set the angle without a guide (spine height method):
Place the knife flat on the whetstone. Lift the spine to create the target angle. Use this formula to find how high to lift the spine:
Spine Height (mm) = Blade Width (mm) × tan(angle°)
For a 45mm wide blade at 20°:
45 × tan(20°) = 45 × 0.364 = 16.4 mm
Stack coins under the spine until it reaches the right height:
- 1 US quarter ≈ 1.75 mm thick
- 8–9 quarters ≈ 15 mm — good for a 20° angle on a standard chef’s knife
Sharpening progression (grit sequence):
| Stone Grit | Purpose |
|---|---|
| 120–400 | Reprofiling, removing chips — skip if edge is just dull |
| 600–800 | Setting the new bevel |
| 1,000–2,000 | Refining the edge |
| 3,000–6,000 | Polishing the edge |
| 8,000+ | Mirror finish, straight razors |
How many strokes per side?
- Start with the same number of strokes on each side (e.g., 10 per side)
- Test sharpness with the paper test — the knife should slice paper cleanly
- Finish with 5 alternating light strokes per side
- Strop on leather to align the very edge of the burr
Maintenance vs reprofiling:
If a knife is just dull (not chipped), start at 1,000 grit and work up. If there are chips or the edge needs to be reset, start at 400 grit. A stropping steel realigns the edge between full sharpenings — use before each cooking session.