Mole Calc
Free software for Windows for the calculation of molecular weights. Also available in French.
Formol
Open source command-line molar weight calculator. C++ source code and Linux packages available.
McDalton
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 of the result.
Molecular Weight Calculator
Calculate the molecular weight and percent composition.
ChemCalc
Online calculator for molecular formula, molecular weight, elemental composition, and isotopic distribution. Java recommended.
Molecular Weight Calculation
Very simple web-based utility for finding the molecular mass, elemental composition, and degree of unsaturation given a chemical formula.
Molecular Weight Calculator
A web-based program that calculates the number of constituent atoms, molecular weight, and percent composition based on a molecular formula.
Molecular weight and elemental analysis calculator
This unix program calculates the formula weight and the element distribution for a given chemical formula.
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