How to Sharpen a Kitchen Knife With a Whetstone: A Calm, Repeatable Method

Quick answer: to sharpen a knife on a whetstone, soak or wet the stone as its maker directs, set it on a damp towel and start on the coarser side, usually around 1000 grit. Hold the blade at a steady angle of about 15 degrees for many Japanese knives or about 20 degrees for many German-style knives, and push it across the stone in smooth strokes until you feel a small burr along the whole edge. Repeat on the other side, then refine both sides on the finer grit.

What you’ll need

• A whetstone. A combination stone with about 1000 grit on one side and 3000 to 6000 on the other suits most home cooks
• Water, and a bowl or sink if your stone is the soaking type
• A damp kitchen towel or a non-slip stone holder
• A flattening plate or coarse flattening stone
• A marker (optional, for checking your angle)
• A sheet of paper or a tomato for testing

Not sure which stone to buy? Our guide to the best whetstones for Japanese knives covers grit choices and soaking versus splash-and-go stones.

Know your knife’s angle before you start

Many Japanese-style knives are sharpened at roughly 12 to 15 degrees per side, and many Western or German-style knives at about 17 to 20 degrees. Harder Japanese steels take a finer edge; softer German steels hold up better with a slightly wider one. Your knife maker’s care guide is the best source, so check it if you can.

You don’t need a protractor. A common trick: holding the spine straight up from the stone is 90 degrees, halfway down is 45, halfway again is about 22, and a bit lower than that is about 15. Some people stack two coins under the spine as a rough visual guide. Consistency matters more than hitting an exact number.

If your knife has a single bevel, like some traditional Japanese blades, the method is different and you should follow the maker’s instructions. The steps below are for common double-bevel kitchen knives.

Step by step

1. Prepare the stone. Soak a soaking stone in water until it stops releasing bubbles, often 10 to 15 minutes. Splash-and-go stones just need water on the surface. Keep a little water on top as you work.
2. Secure it. Set the stone, coarse side up, on a damp towel or in its holder on a stable counter. It shouldn’t slide at all.
3. Mark the edge (optional). Color the bevel with a marker. After a few strokes, check where the ink is gone. If only the top of the bevel is clean, lower the angle; if only the very edge is clean, raise it slightly.
4. Find your angle and grip. Hold the handle in your dominant hand with the edge facing away from you. Rest two or three fingers of the other hand flat on the blade near the edge to keep light, even pressure.
5. Sharpen the first side. Push the blade forward across the stone, edge leading, while sweeping from heel to tip so the whole edge makes contact. Use moderate pressure on the push and lighter pressure on the return. Work in sections if the knife is long.
6. Feel for the burr. After 10 to 20 strokes, carefully run a fingertip from the spine off the opposite side of the edge, never along it. A slight rough lip, called a burr, should run from heel to tip. Keep going until it does.
7. Switch sides. Flip the knife and repeat at the same angle until a burr forms on the first side.
8. Refine on the finer grit. Turn the stone to the fine side, wet it and repeat with lighter pressure, fewer strokes and alternating sides. This polishes the edge and shrinks the burr.
9. Remove the burr. Finish with a few very light, alternating single strokes per side, or strop the edge, spine first, on leather, cardboard or newspaper.
10. Test, rinse and dry. Slice a sheet of paper or a tomato. A sharp edge cuts cleanly without tearing. Rinse and dry the knife and let the stone air-dry before storing it.

Common mistakes

Rocking the angle. Lifting and lowering your wrist during a stroke rounds the edge. Slow down. Fewer, steady strokes beat many sloppy ones.

Moving on before a burr forms. Without a burr along the full length, the two bevels haven’t met and the knife won’t be truly sharp. Patience on the coarse stone saves time overall.

Skipping the tip. The curve near the tip needs you to lift the handle slightly as you go. Check for a burr there specifically.

Pressing too hard. Heavy pressure can chip harder steels and gouge the stone. Let the abrasive do the work.

Letting the stone go dished. Stones wear unevenly and develop a low spot in the middle. Flatten yours every few sessions by rubbing it on a flattening plate until pencil lines drawn across the surface disappear.

Staying safe at the stone

• Keep fingers behind the edge. Rest them on the flat of the blade, never in front of where it’s traveling.
• Check the burr crosswise. Always feel from spine toward edge, not along it.
• Work on a clear, dry counter. Water and metal slurry make things slippery, so keep the towel under the stone and wipe up as you go.
• Clean the blade carefully. Wipe from spine to edge with a folded towel, never by pinching the edge.

For more habits like these, see our kitchen knife safety tips for beginners.

Sharpening versus honing, and when a stone isn’t for you

A whetstone removes metal to create a new edge. A honing rod only straightens an edge that has rolled over. Most home cooks need to sharpen every few months and can hone more often; see how to hone a knife with a honing rod for that routine.

If a stone feels like too much work, a guided or pull-through sharpener is a reasonable alternative. Our guide to the best knife sharpeners for beginners compares the trade-offs, including which types are gentler on thinner blades.

Whetstone FAQ

What grit whetstone should I start with?

A 1000-grit stone handles most routine sharpening. Pair it with a finer stone around 3000 to 6000 for polishing, and add a coarse stone only for chips or very dull knives.

How long should I soak a whetstone?

Many soaking stones need 10 to 15 minutes, or until bubbles stop rising. Splash-and-go stones only need a wet surface. Follow the instructions that came with your stone.

How often should I sharpen my kitchen knife?

For most home cooks, every two to four months, depending on use. If honing no longer brings the edge back, it’s time for the stone.

Can I use oil on a water stone?

No. Water stones are made to be used with water, and oil can clog them. Oil stones are a different type and say so on the label.

How do I know my knife is sharp enough?

It should slice paper cleanly and glide through a tomato skin without pressing. If it snags or tears, return to the fine stone and check for a remaining burr.