Quoted from the linked site:
> Convenience functions have been added, and the search engine can now perform simple calculations and unit conversions. Try 1 pint in cubic centimeters, or 50+sqrt(pi). This functionality is still under development, be patient if it doesn't work.
Why would you make any ever so small effort to implement calculations? I don't get it.
If your search engine enabled me to find more useful search results to my queries than google or yacy or whatever, I wouldn't care one tiny bit about being able to do calculations with it.
Why not focus on the search functionality?