FormulaWeight2011 is a free scientific program to calculate formula/molecular weights of chemical substances. The newest atomic weights from IUPAC are used in this software. Perhaps no further information is needed if you know something about chemistry. The following is an example of calculating the molecular weight of ethanol that is the second most important liquid material, at least to me, on the earth.

Requirements:
* .NET Framework

The license of this software is Freeware, you can free download and free use this calculator software.