To sharpen an 8-inch chef knife, soak or splash a whetstone, hold the blade at a steady angle, and push the edge across the stone in even strokes until a thin burr forms. Then repeat on the other side and finish on a finer surface. Go slowly, and read the maker’s care guide for any warnings about your blade.
Gather Your Setup
- A whetstone, with coarse and fine sides if possible
- A stand or damp towel that holds the stone still
- A cloth for wiping the blade
- A sheet of paper for a final test
Many stones need soaking in water for a short while. Others only need a splash on the surface, so check the instructions that came with yours.
The Sharpening Sequence
- Set the stone on the towel, long side toward you.
- Choose an angle. Many kitchen knives are ground somewhere around 15 to 20 degrees per side, but your maker may specify otherwise.
- Hold the handle with one hand and rest the fingertips of the other on the flat of the blade near the edge.
- Push the blade away from you across the stone as if slicing a thin layer off it, moving from heel to tip.
- Repeat about ten to fifteen times, then feel gently along the back of the edge, never along it, for a rough ridge called a burr.
- Flip the knife and do the same on the other face, using the same number of strokes.
- Switch to the finer side and use lighter strokes, alternating sides.
- Rinse and dry the knife.
Common Mistakes
| Mistake | Result | Fix |
|---|---|---|
| Changing the angle mid-stroke | Rounded edge | Lock your wrist and elbow |
| Heavy pressure | Gouged stone | Use firm but light contact |
| Skipping the burr check | Uneven edge | Look for the ridge along the full length |
Testing Your Work
Hold a sheet of paper by one corner and draw the blade through it gently. A sharp edge slices cleanly without snagging. You can also test on a ripe tomato skin. If it catches in spots, go back to the coarse side for a few more passes in that area.
Sharp edges can cause cuts quickly, so keep fingers clear of the edge, work on a stable surface and follow the maker’s safety guide.
Between sessions, a honing steel or ceramic rod realigns a slightly bent edge, which postpones the stone for a while. Honing does not remove metal in the same way as a stone, so it cannot replace sharpening, but it keeps a good edge cutting well.
FAQ
How often should a chef knife be sharpened?
It depends on use. Hone or tidy the edge as you cook, and use the stone when the knife stops slicing cleanly.
Do I need oil on the stone?
Not with water stones. Some other types do use oil, so check your stone’s instructions.
The Short Version
Set the stone, keep a steady angle, raise a burr on each side, then refine with a finer grit. Test on paper and clean up before storing the knife.