Some useful links for calculating molecular weights.

Chang Bioscience is dedicated to meet the ever-growing demand of bioinformatics software in biomedical research labs. Founded by Dr. Chang Zhu in 2002, Chang Bioscience has developed a series of software ranging from simple recipe calculator to cutting-edge PCR primer, siRNA, and antibody designers.
ChemCalc
Enter a chemical formula and ChemCalc will calculate it molecular formula, molecular mass, exact mass, and elemental analysis will plot an isotopic distribution graph.
The site contains the description and definitions of SI units, their Anglo Saxon equivalents and conversion factors for interconverting the two. Units in common usage are also included.
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