Unveiling The Secrets: How To Read Japanese Tape Measures Like A Master

Japanese tape measures, known as “me???” (mejaa), are essential tools for precise measurements in various industries, including construction, woodworking, and sewing. However, their unique markings can be a puzzle to those unfamiliar with the Japanese system. This blog post will provide a comprehensive guide on how to read Japanese tape measures, empowering you with the knowledge to accurately measure and execute your projects.

Understanding the Markings

Japanese tape measures typically display two sets of markings: metric and traditional Japanese units.

Metric Markings

The metric markings are similar to those found on Western tape measures, using millimeters (mm) and centimeters (cm). The large numbers indicate centimeters, while the smaller tick marks represent millimeters.

Traditional Japanese Units

In addition to metric markings, Japanese tape measures often include traditional Japanese units:

• Sun (?): Equivalent to 3.03 cm or approximately 1.19 inches
• Bu (?): 1/10 of a sun, or 0.303 cm
• Rin (?): 1/10 of a bu, or 0.0303 cm

Reading Metric Markings

To read metric markings, simply identify the large numbers for centimeters and the smaller tick marks for millimeters. For example, a marking at “20.5 cm” indicates 20 centimeters and 5 millimeters.

Reading Traditional Japanese Markings

Reading traditional Japanese markings requires a bit more understanding.

• Sun: Each large number represents a sun. For example, “3” indicates 3 suns or 9.09 cm.
• Bu: Each small tick mark between large numbers represents a bu. For example, a marking between “3” and “4” indicates 3 suns and 1 bu, or 9.39 cm.
• Rin: Small tick marks within a bu represent rin. For example, a marking halfway between two bu tick marks indicates 3 suns, 1 bu, and 5 rin, or 9.15 cm.

Converting Japanese Units to Metric

To convert traditional Japanese units to metric:

• 1 sun = 3.03 cm
• 1 bu = 0.303 cm
• 1 rin = 0.0303 cm

Practical Applications

Understanding how to read Japanese tape measures is essential in various fields:

Construction

Japanese tape measures are widely used in construction to ensure precise measurements for framing, plumbing, and electrical work.

Woodworking

Accurate measurements are crucial in woodworking for joinery, cabinet making, and furniture construction.

Sewing

Japanese tape measures are preferred by many sewers for their precision and ease of use in measuring fabric and patterns.

Advanced Techniques

Reading Diagonal Measurements

To measure diagonal distances, use the Pythagorean theorem: a² + b² = c². Measure the two adjacent sides (a and b) and calculate the hypotenuse (c) using the formula.

Using the Reverse Side

Some Japanese tape measures have a reverse side with markings for specific materials, such as leather or fabric. This allows for more accurate measurements in specialized applications.

Wrapping Up

Mastering how to read Japanese tape measures unlocks a world of precise measurements and empowers you to tackle projects with confidence. By following these guidelines and practicing regularly, you’ll become an expert in deciphering the markings and ensuring accuracy in all your measurements.

What You Need to Learn

Q: What is the difference between a metric tape measure and a Japanese tape measure?
A: Metric tape measures use only metric units (mm, cm), while Japanese tape measures include both metric and traditional Japanese units (sun, bu, rin).

Q: How do I convert 2 suns and 3 bu to centimeters?
A: 2 suns = 6.06 cm, 3 bu = 0.909 cm. Total: 6.969 cm.

Q: What is the most common unit of measurement on Japanese tape measures?
A: Centimeters (cm) are the most commonly used unit, followed by millimeters (mm).