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Interactive Sharpening Tool

Whetstone Angle & Coin-Stack Calculator

Never guess your sharpening angle again. Select your knife type to reveal the precise bevel angle, recommended stone grits, and the physical coin trick to lock in your angle.

Japanese San Mai / Damascus

Japanese Gyuto (Chef Knife)

15°Per Side
30°Included Angle
The Physical Coin Height Rule:

Place 2 standard coins (quarters) stacked directly under the spine of the knife while resting on the whetstone.

Physical spine elevation: approx. 3.5mm under spine

25¢
25¢
= 15° Angle
Recommended Stone Grits:

1000 grit (sharp) -> 6000 grit (polish)

Use the medium grit to form an even wire burr; transition to the high-grit waterstone to polish the apex.

Cutting Motion:

Push-cutting or gentle forward draw slicing.

The premier all-purpose Japanese knife. An acute 15-degree bevel slices through proteins and vegetables with minimal resistance.

Bilateral Symmetry Counter (Keep Both Sides Equal)

Uneven passes cause your cutting bevel to migrate off-center. Tap to count strokes per side: