What does it mean to have a sharp knife?

Most people can't answer that question with a number. They go by feel, does it slide through a tomato, does it catch on paper, does it feel "sharp enough." That's fine for a gut check. But there's an actual standard for measuring knife sharpness, and it's worth knowing.

The BESS Knife Sharpness Scale

BESS stands for Brubacher Edge Sharpness Scale. It's the standard measurement system used by professional sharpeners to quantify how sharp an edge is. The number represents the grams of cutting force required to sever a certified test media (a uniform poly string). Lower number = sharper knife.

How to read the numbers

Here's what the BESS scale looks like in practice:

• 100 or below — Double-edge razor blade. Surgical sharp.
• 200–300 — New high-end cutlery edge. Where your knife should be after professional sharpening.
• 400–500 — Edges in need of maintenance. Still cuts, but working harder than it should.
• 600–800 — Moderately rolled edge. You'll notice resistance on soft vegetables and proteins.
• 1200–1500 — Severely rolled or bent edge. Likely doing more tearing than cutting.
• 2000 — Unsharpened blank. A butter knife measures around here.

Most kitchen knives come out of the box around 300–400g. After regular home use without honing or sharpening, they'll drift to 600–900g before most people notice anything is wrong. By the time a knife feels obviously dull, it's often above 1000g.

How BESS sharpness is measured

To get a BESS reading, you need an Edge-on-Up tester, a small device that holds a certified poly string at a controlled tension. You press the blade down through the string and the scale records the force in grams at the moment of cut. It takes about 10 seconds per knife and gives you a repeatable, objective number.

At Vivront, we test knives periodically. It's one of the ways we hold ourselves to a standard instead of simply a feel.

What score should your kitchen knife hit?

For a general-purpose chef's knife or santoku, aim for 200–300g BESS. Japanese knives with thinner geometry can go below 200g and still hold their edge for awhile under normal use. German knives with a softer metal and thicker blades typically land in the +200g range after sharpening. 

If your knife is above 500g, it's likely time to sharpen. If it's above 800g, it's been time for a while.

Sharpen your knives

We sharpen by mail — you ship your knives in our prepaid kit, we sharpen and test every edge, and ship them back. Start your order here.