Chemistry Tools

Free chemistry calculators — molar mass from any formula with each element's mass percent, grams-to-moles conversion, and hydrate and bracket support.

2 tools
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Chemistry tools

Molar Mass Calculator

Type a chemical formula such as Ca(OH)2 or CuSO4·5H2O to get its molar mass in g/mol, each element's mass percent, and grams-to-moles conversions.

Also in Chemistry

Tools from other categories tagged with Chemistry

Half-Life Calculator

Solve radioactive decay for the amount left, starting amount, half-life or time elapsed, with carbon-14 and other isotope presets and a decay curve.

Why These Tools

Chemistry homework turns on the mole. Before a reaction can be worked with real quantities, each formula has to become grams per mole, and adding up eighteen atomic weights by hand is exactly where slips happen. Molar Mass Calculator reads formulas with nested brackets and hydrate dots, shows each element's mass percent, and converts between grams, moles and particles using the exact 2019 value of the Avogadro constant.

Its atomic weights are the IUPAC values printed on classroom periodic tables, so answers line up with a marking scheme. Half-Life Calculator is listed here from Physics as well, because radioactive decay is taught as nuclear chemistry in most syllabuses. This page is meant to grow into a small bench for general chemistry. An equation balancer, molarity and dilution, pH and the gas laws are planned next.