Weight and Mass Conversion
Convert units of weight and mass
Features
Abundant weight and mass units
Covers over 70 units including kg, g, tons, and pounds
Convert to all units at once
Enter just one value to list the values for all corresponding units
Supports shakkanho and special units
Converts kan, kin, and momme as well as carats and atomic mass units
Copy results with one click
Grab each converted value instantly with its copy button
How to use
Select the base unit
Specify the unit of the entered value from the base unit dropdown
Enter the value to convert
Entering a number in the value field runs the conversion instantly
Check and copy the results
Check the converted values for all units in the list on the right and copy them to use
Use cases
Converting quantities in overseas recipes
Reinterpret ingredients given in pounds or ounces into grams
Checking weight for mailing and shipping
Convert a package's weight into the required unit to determine the shipping tier
Aiding science and physics study
Grasp the magnitude of atomic mass units and celestial masses on a kg basis
Measuring gems and precious metals
Convert carats and troy pounds into familiar units
Reinterpreting Japanese measurement units
Convert shakkanho values like kan, kin, and momme into grams
Basic Knowledge
How many grams are in a pound and ounce?
1 pound (lb) is 453.6g, and 1 ounce (oz) is 1/16 of that, approximately 28.35g. These units are widely used in contexts originating from the United States, such as boxing weight classes and food quantities.
What are kan and monme?
Kan (貫) and monme (匁) are units of weight in Japan's traditional system of measurement. 1 kan equals 3.75kg, and 1 monme equals 1/1,000 of that, or 3.75g. Monme is still used as an international unit in pearl trading.
Safety and privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
Unit conversion is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
Input values and conversion results and input suggestions are not stored on the server.
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RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
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Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
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If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
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Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.