Free formula mass calculator for Windows, uses the latest values of atomic weights as recommended by IUPAC. For educational purposes, shows calculations as well as the uncertainty ...
http://hem.fyristorg.com/ch.s/mcdalton/
This unix program calculates the formula weight and the element distribution for a given chemical formula.
http://www.st.hirosaki-u.ac.jp/~rmiya/xmolwt/xmolwt-e.html
Very simple web-based utility for finding the molecular mass, elemental composition, and degree of unsaturation given a chemical formula.
http://www.chemie.fu-berlin.de/cgi-bin/molform
A web-based program that calculates the number of constituent atoms, molecular weight, and percent composition based on a molecular formula.
http://www.humboldt1.com/~medusa/page/molecalc/index.html
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