Basic Knowledge of Knife Length Measurements | Methods and Nenohi Series Standards

In our previous article, we explained the terminology for different parts of a knife. This time, we'll provide a detailed explanation of blade length measurements.

At Nenohi, we use two different length measurement standards depending on the series: 
Edge Length and Length from the Machi. Both provide important information about a knife's dimensions, but because they measure from different starting points, the same knife can display different numerical values.
In this article, we'll explain the differences between these measurement methods and which standard applies to each series. 
We hope this information helps you make informed decisions when selecting a knife.

■Edge Length

Edge Length refers to the length of the sharpened (cutting) portion of the blade. This measurement is typically used for Western-style knives.

 

■Length from the Machi

As the name suggests, Length from the Machi refers to the length measured from the machi (the notch where the blade meets the handle) to the tip/kissaki. This measurement is typically used for Japanese-style knives.
Note: Deba knives are an exception and are measured by Edge Length (the sharpened portion).

 

■Numerical Differences Due to Measurement Methods

Let's compare how much numerical difference arises between these two measurement methods using Western-style and Japanese-style knives. Please refer to the diagram below.

This diagram shows both Japanese-style and Western-style versions of a Gyuto 210mm.
(Note: Japanese-style knives are often manufactured approximately 3mm longer than their stated length, which is reflected in the diagram above.)
While a "Western-style" Gyuto 210mm has 210mm (+approx. 3mm) of sharpened edge, a "Japanese-style" Gyuto 210mm has 195mm (+approx. 3mm) of sharpened edge—a difference of approximately 15mm from the stated measurement.

This difference varies depending on the knife shape, but if you expect a knife listed with Length from the Machi to have the same edge length as one measured by Edge Length, the actual sharpened portion may feel shorter than anticipated.

When purchasing a knife, if you have concerns about which measurement method is being used, we recommend confirming with store staff or the manufacturer.

 

■Length Measurement Standards for Each Our Series

Below is an outline of which measurement standard—Edge Length or Length from the Machi—applies to each our series.
Note: "Custom-made knives" in the table refers to Sakaki, Ren, and Hiragi series.

 

Blade length measurements are a crucial factor when selecting a knife. Understanding the differences in measurement standards allows you to make more precise size choices suited to your workspace and intended use. We hope this article serves as a helpful resource in choosing the right knife for your needs.

If you have any questions about our products, please contact us through our inquiry form.