Chemistry Calculators
Acid-Base Titration Calculator
Solve CaVa = CbVb for acid-base titrations to find an unknown concentration or volume at the equivalence point between an acid and a base solution.
Buffer pH Calculator
Calculate the pH of an acid-base buffer from pKa and the concentrations of the weak acid and its conjugate base using the Henderson-Hasselbalch equation.
Chemical Equation Balancer
Balance a chemical equation by solving the atom-conservation system with exact fractions, returning the smallest whole-number coefficients possible.
Concentration Calculator
Find solution concentration in mol/L from moles of solute and volume of solution, the core molarity relationship behind every solution prep calculation.
Dilution Calculator
Solve the C1V1 = C2V2 dilution equation for any missing variable when scaling a concentrated stock solution down to a target working concentration.
Dilution Ratio Calculator
Calculate the exact stock and diluent volumes needed to prepare a target total volume from a stock:diluent ratio like 1:4 or 1 plus 9.
Empirical Formula Calculator
Derive a compound's empirical formula from elemental mass percentages by converting each to moles and reducing to the simplest whole-number ratio.
Equivalent Weight Calculator
Calculate equivalent weight by dividing molar mass by the n-factor, the mass that delivers exactly one mole of usable reactive capacity.
Gas Law Calculator
Solve the ideal gas law PV = nRT for pressure, volume, moles, or temperature, with automatic Celsius-to-kelvin temperature conversion built in.
Half-Life Calculator
Calculate remaining quantity after radioactive decay, or solve for the half-life itself given starting and ending amounts and the elapsed time.
Henderson-Hasselbalch Calculator
Calculate solution pH from a weak acid's pKa and the ratio of conjugate base to acid concentration using the Henderson-Hasselbalch equation.
Ionic Strength Calculator
Calculate a solution's ionic strength from the concentration and charge of each dissolved ion, required for activity coefficient corrections.
Limiting Reactant Calculator
Identify which reactant limits a reaction's yield by comparing moles divided by stoichiometric coefficient for each reactant in the equation.
Mass Percent Calculator
Calculate the mass percent of a component within a mixture or solution from its mass and the total mass, the way most product labels report concentration.
Molality Calculator
Calculate molality from moles of solute and kilograms of solvent, the temperature-independent concentration unit used in colligative property work.
Molar Mass Calculator
Calculate the molar mass of any chemical formula, including nested parentheses like Ca(OH)2, by summing standard atomic weights element by element.
Molarity Calculator
Solve for molarity, moles, or volume in the molarity relationship, the concentration unit stoichiometry and solution prep calculations are built around.
Molecular Formula Calculator
Scale an empirical formula up to the true molecular formula using the compound's actual molar mass and a computed whole-number multiplier.
Molecular Weight Calculator
Calculate a compound's molecular weight by summing the atomic weight contribution of every atom in its chemical formula, including grouped subscripts.
Moles Calculator
Convert a measured mass into moles using a known molar mass, or enter a chemical formula directly and let the calculator determine molar mass for you.
Normality Calculator
Calculate normality from molarity and the n-factor, accounting for how many reactive equivalents each mole of a compound actually provides.
Osmolarity Calculator
Calculate osmolarity from molar concentration and the van't Hoff dissociation factor, accounting for how many particles each solute produces.
pH Calculator
Convert between pH and hydrogen ion concentration in either direction using pH = -log10[H+], with a reference table of common acids and bases included.
Reaction Yield Calculator
Calculate percent yield from actual and theoretical yield to evaluate how efficiently a chemical reaction converted reactants into isolated product.
Redox Calculator
Calculate standard cell potential from cathode and anode reduction potentials, and determine whether a redox reaction is spontaneous under standard conditions.
Stoichiometry Calculator
Calculate the mass of product formed from a reactant's mass or moles, using the balanced equation's stoichiometric coefficients and molar masses.
Volume of Gas Calculator
Calculate the volume a gas occupies from its moles, temperature, and pressure, using the ideal gas law rearranged to solve for volume directly.
The Formulas That Anchor Every Chemistry Course
A small set of relationships — molarity, the ideal gas law, pH, and stoichiometric ratios — underpins nearly everything taught from introductory to analytical chemistry, and getting comfortable with them is often the real hurdle in a chemistry course, more than memorizing reactions. Twenty-seven calculators here cover that core toolkit plus the more specialized tools used in lab work.
Popular Chemistry Calculators
Highlights across solution chemistry, reactions, and acid-base equilibria:
- Molarity Calculator — finds moles of solute per liter of solution, the standard unit for solution concentration.
- Molar Mass Calculator — sums atomic masses from a chemical formula to find the mass of one mole.
- Stoichiometry Calculator — converts between reactants and products using balanced equation ratios.
- pH Calculator — finds pH from hydrogen ion concentration, or works backward from a known pH.
- Dilution Calculator — applies C1V1=C2V2 to find the volume needed to reach a target concentration.
Why Stoichiometry Trips Up So Many Students
Stoichiometry problems fail for a specific, recurring reason: students convert grams to moles correctly, apply the mole ratio from the balanced equation correctly, but skip identifying the limiting reactant first — and every downstream number is wrong if the wrong reactant is assumed to run out. The same logic extends to reaction yield calculations, where a theoretical yield calculated from the limiting reactant gets compared against an actual measured yield to find percent yield, a number that's always less than 100% in real lab conditions due to side reactions, incomplete reactions, and product lost during purification.
Frequently Asked Questions
What's the difference between molarity and molality?
Molarity is moles of solute per liter of solution (volume-based and temperature-sensitive), while molality is moles of solute per kilogram of solvent (mass-based and temperature-independent) — molality is preferred for precise work involving temperature changes.
Why does the same pH calculator give different answers for strong versus weak acids?
Strong acids dissociate completely, so pH follows directly from concentration, while weak acids only partially dissociate according to their acid dissociation constant (Ka), requiring an equilibrium calculation rather than a direct conversion.
Explore More
Need physical rather than chemical formulas? See the Physics Calculators, or check molecular-level biology in the Biology Calculators.