Actually, I am looking for a good (read: high precision values) comprehensive table of units and conversion factors to add to this. Before I add new units however I need to add a filter that rejects converted values if they get too large (ie if I ask for 1500 miles I don't want to know how much that is in milimeters).

But that's on the wishlist - for now, I needed to scratch an itch, and most every unit conversion CGI page I found out there was at least mildly painful. The too large filter is actually a bit more complex than the nobrainer too small filter. I'll update the script and add more many units when I have a few spare brain cycles (time is plentiful, but my mind is always elsewhere :-) ).

Makeshifts last the longest.