Sharpen a Kitchen Knife
Restore a dull kitchen knife's edge using a sharpening steel or whetstone. Proper technique keeps the blade safe and effective for daily prep.
Quick answer
Hold the knife at a 15–20 degree angle to the sharpener. Draw the blade across the stone or steel from heel to tip, repeating evenly on both sides until the edge catches light uniformly. Rinse, dry, and test on a tomato or sheet of paper.
A blunt knife is more dangerous than a sharp one because it slips under pressure. You do not need expensive gear to fix this. A basic whetstone or sharpening steel, used correctly, will bring the edge back in minutes.
What you’ll need
- sharpening steel or whetstone (1000 grit)
- damp cloth
- honing steel (optional)
- cutting board
Step by step
- 1
Secure your workspace
Lay the damp cloth on a flat surface and place the cutting board on top. This stops everything from sliding. If you are using a whetstone, soak it in water for 10–15 minutes first.
- 2
Set the angle
Hold the knife so the blade meets the stone or steel at roughly 15–20 degrees. Imagine the back of the blade is lifting half a thumb's height off the surface. Consistency matters more than exact precision.
- 3
Draw the blade across the stone or steel
Starting at the heel, sweep the blade toward the tip in one smooth stroke. Apply light, even pressure. If you are using a steel, alternate sides with each stroke. On a whetstone, do 5–10 strokes on one side, then switch.
- 4
Check for a burr
Run your fingertip gently away from the edge on each side. A slight roughness, called a burr, means you have ground steel to the centre. Once you feel it, reduce pressure and do two or three light strokes per side to remove it.
- 5
Hone the edge (optional)
A honing steel realigns the edge but does not remove metal. Hold the steel vertically with the tip on the board. Draw the blade down at the same 15–20 degree angle, alternating sides. Two or three passes per side is enough.
- 6
Rinse and test
Wash the knife in warm soapy water to remove metal particles. Dry it immediately. Test the edge by slicing through a sheet of paper or the skin of a tomato. It should cut cleanly without tearing or slipping.
Sharp blades can cut deeply with little effort. Always draw the edge away from your body and fingers. Keep fingers behind the blade at all times. Store knives in a block or on a magnetic strip so edges do not knock against other tools.
Common mistakes
- Sharpening at too steep an angle, which weakens the edge and makes it blunt faster.
- Using a dry whetstone, causing uneven grinding and possible blade damage.
- Pressing too hard, which removes too much metal and overheats the edge.
- Confusing a honing steel with a sharpener; honing only straightens, it does not grind a new edge.
Frequently asked
How often should I sharpen my kitchen knives?
For home use, sharpen every 2–3 months. Honing can be done weekly to keep the edge aligned between sharpenings.
Can I use a mug or plate bottom instead of a stone?
The unglazed ring on the base of some ceramic mugs can work in an emergency, but it is hard to keep a consistent angle. A proper stone or steel gives far better, safer results.
What is the difference between a 1000 grit and a 3000 grit stone?
1000 grit reshapes and repairs a dull edge. 3000 grit polishes and refines it further. Start with 1000; move to a finer grit only if you want a smoother, sharper finish.
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