We are constantly adding to the units conversions and physical constants and properties database which is supplied with our products such as Calc98 and ObjectiF. We post these updates for downloading free of charge. As a user, you can of course modify the database. But it is often far more convenient if you can have your own modifications added to the "official" version of the data file.

The solution is to submit your data using the form below. If your browser does not support forms, then please use email instead. If you have concerns about submitting information about yourself using this form, please refer to our Online Privacy Statement.

When we have received your input, we will check its accuracy and add it to the next version of the database. We are only able to add data which is of general use. We are also unable to add values which are not of a constant nature (for example currency exchange rates). Please do not submit data which is proprietary.

If you do not have a value for the constant, you can still submit the request for inclusion, and we will try to track it down for you.

Please remember to press the Send Data button at the end after completing your form.

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What type of data do you wish to submit?:

Units conversion
Physical constant
Physical property
Other

Please give the name and value or conversion factor (to SI)