Calculation

ChemBuddy - - Calculators for pH, solution preparation and concentration conversion, acid-base equilibrium, buffer, hydrolysis, and dilution calculations.

Chemical Calculator - - Free Windows program for calculateing conversion factors between compounds, concentration, and amount of substance in solution.

Chemical Calculator - - Chemistry shareware for Windows which calculates the amount of reagent to use when mixing, diluting, and dispensing solutions.

Chemistry Functions - - Molar conversions and an interactive periodic table directly on the webpage. Requires JavaScript.

Elem - - Free program for the interpretation of elemental analysis results. For Windows and Unix; source code available.

Isotope Pattern Calculator v2.0 - - A JavaScript shareware program that calculates isotopic ratio patterns for molecular fragments.

JFormula - - Information System intended to support multi-stepped technological processes that can be defined on a table of mixes and ingredients and do not involve chemical reactions. The system includes an algorithm to calculate material requirements.

Laborant Chemstation - - English version of German freeware data analysis program, for various calculations including stoichiometry, pH, thermochemistry, and kinetics.

MS Tools - - Online exact mass calculator, mass spectrum generator, and isotope distribution calculator.

Norgwyn Montgomery Software - - NGMSI sells software for 3-D molecular modeling, chemical database creation and manipulation, 2-D publication quality drawing, calculation of over 100 physical properties from structure, automatic chemical internet database generation, and QSAR and QSPR analysis as well as chemical databases.

Physicochemical Calculators - - Simple online and offline calculators for boiling point at reduced pressure, unit conversion, and molecular mass.

Reagent Calculator - - Windows software for the calculation of molecular weight, molecular formulas, mass percentages, mass spectroscopy fragments and adducts, and elemental analysis component; also includes a reagent library.

Visual MINTEQ - - A free equilibrium speciation model, which calculates chemical equilibria in aqueous systems at low ionic strength.