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Chemistry calculators

Start with mass and moles, find a solution concentration, or count the entities in a sample. Each tool keeps the formula, units and working visible.

MASS ↔ AMOUNT
Grams to moles calculator
Convert mass and moles using a chemical formula or known molar mass. Includes element breakdowns, hydrates, flexible units and batch conversions.
Convert grams and moles
SOLUTION CONCENTRATION
Molarity calculator
Use solute mass, a formula or molar mass, and the final solution volume to find mol/L. See the grams-to-moles step and the concentration calculation.
Calculate solution molarity
MOLECULES, FORMULA UNITS & ATOMS
Grams to molecules calculator
Convert a sample mass into a count with Avogadro’s constant. Explicitly choose molecules, formula units or elemental atoms so the result names what you are counting.
Find an entity count

Useful chemistry tools, free to reuse. If a calculation needs a correction or a clearer explanation, email contact@gramstomoles.org.