Chemistry calculators
Balance equations, work out molar masses and reaction yields, find electron configurations and oxidation states, and calculate pH. Each result shows the method behind it.
7 calculators
Chemical Equation Balancer
Balance chemical equations, including ionic and redox reactions in acidic or basic solution.
Electron Configuration Calculator
Electron configurations of all 118 elements and simple ions, with orbital diagrams and exceptions explained.
Molar Mass Calculator
Molar mass and percent composition of any formula, including brackets, hydrates and ions.
Oxidation State Calculator
Oxidation states of every element in a compound or ion, with the rule behind each one.
pH, pOH and Buffer Calculator
pH of strong and weak acids and bases and of buffers, solved exactly, with Ka and pKa conversions.
SMILES to IUPAC Name
Look up the IUPAC name of a structure from its SMILES, or find the structure of a named compound.
Stoichiometry Calculator
Limiting reactant, excess left over, and theoretical and percentage yield from any reaction.
No calculator in this category matches that filter.
About these calculators
The chemistry calculators use standard atomic weights published by the IUPAC Commission on Isotopic Abundances and Atomic Weights, and fundamental constants from the 2019 revision of the SI. Each calculator states the assumptions it makes, such as ideal behaviour or a temperature of 25 °C.