All Calculators
Use this page as the starting point for common chemistry calculations. Each tool keeps the formula visible, shows a worked result, and links to related calculators so you can move through a full problem without losing your place.
Chemistry Calculators
Choose a chemistry calculator for mole conversions, molar mass, solutions, concentration, stoichiometry, yield, and composition work.
Mole and Mass Calculators
Mole conversions are the backbone of stoichiometry. Start with the grams to moles calculator when a problem gives mass and asks how many moles are present. Use the moles to grams calculator when a balanced equation gives moles and you need a measurable mass for the lab.
The molar mass calculator supports both workflows because molar mass is the conversion factor between grams and moles. For example, 18.015 g/mol lets you convert between grams of water and moles of water with one division or multiplication.
When you need to go from moles to individual particles, use the moles to molecules calculator (multiplies by Avogadro's number) or the moles to atoms calculator (also accounts for atoms per molecule, so you get the true atom count for compounds like H₂O or CO₂).
Solution and Concentration Calculators
Solution problems often ask for concentration, dilution, or the amount of solute needed to prepare a volume. The molarity calculator uses M = n / V for moles per liter. The dilution calculator uses C1V1 = C2V2 for stock solutions and working solutions.
If your problem uses grams per liter, milligrams per milliliter, or another amount-per-volume unit, use the solution concentration calculator. For acid-base or equivalent-based problems, the normality calculator helps connect molarity to reactive equivalents.
Reaction and Composition Calculators
When a balanced chemical equation includes more than one reactant, the limiting reagent calculator helps identify which reactant runs out first and controls the theoretical yield. After the experiment, the percent yield calculator compares actual yield with theoretical yield.
For mixture or formulation questions, the mass percent calculator finds what fraction of a sample is represented by one component. This is useful for alloys, hydrates, solutions reported as weight percent, and introductory composition problems.
Suggested Workflow
- Find molar mass if the chemical formula is part of the problem.
- Convert grams to moles before using mole ratios from a balanced equation.
- Use the limiting reagent when two or more reactants are present.
- Convert the predicted moles of product back to grams if the answer needs mass.
- Use percent yield after the actual lab result is known.
This order mirrors how chemistry problems are solved on paper: identify the unit, convert to moles, apply the formula or mole ratio, then convert into the requested final unit.
If you are unsure which calculator to open first, look at the unit in the question. Problems that start with grams usually need molar mass and mole conversion. Problems that include liters usually involve molarity, dilution, or concentration. Problems that compare actual and theoretical product belong in the reaction and yield tools.