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The policy WP:CALC express, in general terms, when an editor can add some calculations (to an article) that are not in the sources, but are an obvious and acceptable interpretation of the source data:
- Routine calculations do not count as original research. Basic arithmetic, such as adding numbers, converting units, or calculating a person's age, is allowed provided there is consensus among editors that the calculation is an obvious, correct, and meaningful reflection of the sources.
This essay supports both, a detailed review of "Routine calculations" at Wikipedia, and a natural extension to this policy:
- The recursive use of routine calculations, such as summation, products of sequences, or the calculation of averages, also do not count as original research, when interpreted by the article's reader as a summary of numerical data — i.e. when used for well-known (and consensual) forms of "numerical synthesis". In this context, the synthesis of numerical data is not original research by synthesis.