To sharpen a knife, hold it at a consistent angle (about 15 to 20 degrees) against a whetstone, draw the blade across the stone from heel to tip on each side until a burr forms, then refine on a finer grit and finish with a few light passes. A sharp knife is safer and easier to use, and sharpening is a skill any cook can learn. The keys are a consistent angle and finishing with honing. This guide explains how to sharpen a knife step by step.
Hold the blade at about 15 to 20 degrees on a whetstone, draw it heel to tip on each side until a burr forms, refine on a finer grit, then finish with light passes and a hone. A consistent angle is the key.
What You Need
- A whetstone (a dual-grit stone is ideal), or an electric or pull-through sharpener.
- Water or oil for the stone (check the type).
- A damp cloth to stop the stone sliding.
- A honing rod to finish. See best knife sharpeners.
How to Sharpen a Knife on a Whetstone
- Soak or wet the stone as required and set it on a damp cloth.
- Hold the blade at about 15 to 20 degrees (lower for Japanese knives, higher for German).
- Draw the blade across the coarse grit from heel to tip, as if shaving a thin layer off the stone.
- Repeat on the other side, keeping the same angle, until you feel a small burr along the edge.
- Switch to the fine grit and repeat with lighter pressure to refine the edge.
- Finish with a few very light alternating passes, then hone with a steel.
- Test sharpness on paper or a tomato.
Key Takeaway: Angle consistency beats everything. Holding the same angle on every stroke matters far more than pressure or speed; if you wobble, you round the edge. Use a guide clip if you struggle to hold the angle.
Electric and Pull-Through Sharpeners
Electric sharpeners and pull-throughs are faster and need no skill: just draw the knife through the slots following the instructions. They are convenient but remove more metal than a stone, and harsh pull-throughs are not ideal for fine Japanese edges. See whetstone vs electric sharpener.
Honing vs Sharpening
Honing realigns the edge and should be done often; sharpening removes metal to create a new edge and is done occasionally. See honing vs sharpening and how often to sharpen.
Safety Notes
- Sharpen with the edge moving away from your body.
- Keep the stone or sharpener stable.
- Wipe the blade afterward to remove metal dust.
- A sharp knife is safer than a dull one.
FAQ
How do you sharpen a knife?
Hold the blade at about 15 to 20 degrees on a whetstone, draw it heel to tip on each side until a burr forms, refine on a finer grit, then finish with light passes and a hone.
What angle do you sharpen a knife at?
Around 15 to 20 degrees per side. Japanese knives use a lower angle (around 15 degrees) and German knives a slightly higher one (around 20 degrees).
Is a whetstone better than an electric sharpener?
A whetstone gives the best, most controlled edge and removes less metal, but needs practice. Electric sharpeners are faster and easier.
Bottom Line
Sharpen a knife by holding a consistent 15 to 20 degree angle on a whetstone, raising a burr, refining on fine grit and finishing with a hone. With practice it becomes quick and satisfying. See our best knife sharpeners and honing vs sharpening guides.
