bu to mm Converter

Convert Bu to mm instantly.

Free online converter with accurate results and clear explanations.

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How This Tool Works

This converter treats bu as the Japanese length unit 分. Under the modern shakkanho relationship, 1 bu = 1/330 meter, which is 3.030303 millimeters.

The formula is: millimeters = bu × 3.030303. In reverse, bu = millimeters ÷ 3.030303.

  • Input: Japanese bu (分)
  • Conversion factor: 1 bu = 3.030303 mm
  • Output: Millimeters

Common Mistakes to Avoid

  • Do not use a 1:1 ratio: One Japanese bu is about 3.03 millimeters, not 1 millimeter.
  • Check the unit context: This page converts Japanese bu (分) as a length unit. Other similarly named historical units can mean different things.
  • Keep precision until the end: Use the full converted value for technical work, then round only to the precision your project requires.

Frequently Asked Questions

Common questions about the bu to mm Converter

A bu is a traditional Japanese unit equal to about 3.03 mm (0.1 sun). Used in traditional crafts and martial arts equipment sizing.
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Sources & References

International System of Units (SI): length and distance

Length and distance is measured in the metre (m); 1 inch = 25.4 mm exactly. Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.
→Source: NIST — International System of Units (SI)

International System of Units (SI)

Authoritative definitions for length and distance, from the BIPM SI Brochure (9th edition), the defining reference for the SI.
→Source: BIPM — SI Brochure (9th ed.)

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