Category
Chemistry
Moles, molarity, gas laws, thermochemistry, and atomic chemistry — with formulas and step-by-step results in your browser.
Convert between moles and grams, calculate molarity and dilutions, apply gas laws, and work through thermochemistry problems with clear formulas. Built for high-school and introductory college chemistry — every calculation runs privately in your browser with step-by-step context.
29 tools · Private · Browser-only
Featured calculators
Popular starting points for chemistry homework and quick checks.
Mole Calculator
Convert between moles, particles, and mass.
OpenMolarity Calculator
Calculate molarity from moles and volume.
OpenIdeal Gas Law Calculator
Solve PV = nRT for any variable.
OpenMolar Mass Calculator
Find molar mass from a chemical formula.
OpenDilution Calculator
Use C₁V₁ = C₂V₂ to dilute stock solutions.
OpenHalf-Life Calculator
Model radioactive decay over time.
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Guides & comparisons
What Is a Mole? Understanding Amount of Substance
The mole is chemistry's counting unit — 6.022 × 10²³ particles. This guide explains why it exists and how to convert between moles, grams, and molecules.
How to Calculate Molarity Step by Step
Molarity is moles of solute per liter of solution. Learn the formula, how to prepare stock solutions, and when to use C₁V₁ = C₂V₂ for dilutions.
Understanding the Ideal Gas Law (PV = nRT)
PV = nRT connects the four variables that describe a gas sample. This guide explains each term, unit choices for R, and when real gases deviate.
Limiting Reactant Explained for Stoichiometry
The limiting reactant runs out first and caps product yield. This guide walks through mole-ratio comparison with a worked example.
Basic chemistry
Mole Calculator
Convert between moles, particles, and mass.
OpenMolar Mass Calculator
Find molar mass from a chemical formula.
OpenMolecular Weight Calculator
Compute molecular weight of any compound.
OpenGrams to Moles Calculator
Convert a mass in grams to moles.
OpenMoles to Grams Calculator
Convert moles to mass in grams.
OpenMass Percent Calculator
Find mass percent composition of a compound.
OpenPercent Yield Calculator
Compare actual vs. theoretical yield.
OpenEmpirical Formula Calculator
Derive the simplest whole-number ratio.
OpenMolecular Formula Calculator
Find the true molecular formula from empirical data.
OpenLimiting Reactant Calculator
Identify the limiting reagent in a reaction.
OpenSolutions
Molarity Calculator
Calculate molarity from moles and volume.
OpenMolality Calculator
Express concentration as moles per kilogram.
OpenNormality Calculator
Find normality for acid-base and redox work.
OpenDilution Calculator
Use C₁V₁ = C₂V₂ to dilute stock solutions.
OpenSolution Concentration Calculator
Convert between common concentration units.
OpenGas laws
Ideal Gas Law Calculator
Solve PV = nRT for any variable.
OpenBoyle's Law Calculator
Relate pressure and volume at constant temperature.
OpenCharles's Law Calculator
Relate volume and temperature at constant pressure.
OpenCombined Gas Law Calculator
Link P, V, and T when moles are constant.
OpenGay-Lussac's Law Calculator
Relate pressure and temperature at constant volume.
OpenDalton's Law Calculator
Find partial pressures in gas mixtures.
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