Here are some Web-based Isotope Pattern Caculators that I recently tracked down for a Usenet post:

Molmass (Java with downloadable ‘lite’ version)


SIS MS Tools

Sheffield Chemputer

For stand-alone there is Isopro for Windows

and the Macintosh Isotope Pattern Calculator

The 16th International Mass Spectrometry Conference will be held in Edinburgh, Scotland, between August 31st and September 5th 2003. That’s still a long way off, but it’s worth bookmarking the 16th IMSC Web page at There’s no link back to the International Mass Spectrometry Society on the page, so here it is: Note that the IMSS site is on a Netherlands server and has a “.nl” rather than a “.com” or “.org” Web address.