Chemistry
Chemistry Calculators
Solve molarity, dilution, pH, stoichiometry, and lab concentration problems.
21 tools
Mole Calculator
Mole calculator: convert grams to moles from sample mass and molar mass for chemistry homework and labs. Free, formula shown, runs locally, no signup.
Significant Figures Calculator
Significant figures calculator: round any number to your chosen sig figs with step-by-step counting rules shown. Free, runs locally in your browser, no signup.
Average Atomic Mass Calculator
Average atomic mass calculator: compute the weighted atomic mass of an element from its isotopes' masses and natural abundances. Free, runs in your browser.
Buffer Solution Calculator
Buffer solution calculator: use the Henderson-Hasselbalch equation to find buffer pH from pKa and acid to conjugate base ratio. Free, private, runs locally.
C1V1 = C2V2 Calculator
C1V1 = C2V2 calculator: solve the dilution equation for any missing concentration or volume when mixing stock solutions. Free, private, runs in your browser.
Dilution Calculator (C1V1=C2V2)
Dilution calculator: solve C1V1 = C2V2 for stock volume, final volume, or final concentration when preparing lab dilutions from a stock solution. Free, no signup.
Electron Configuration Calculator
Electron configuration calculator: write full and noble gas orbital configurations plus valence electrons for any element. Free, private, runs locally, no signup.
Empirical Formula Calculator
Empirical formula calculator: convert percent composition into mole ratios and the simplest whole-number empirical formula step by step. Free, no signup.
Equilibrium Constant Calculator
Equilibrium constant calculator: compute Kc from equilibrium concentrations or solve for a missing concentration in a reaction. Editable, free, runs locally.
Gas Laws Calculator
Gas laws calculator: solve ideal gas and combined gas problems for pressure, volume, temperature, or moles of a gas. Free, runs in your browser, no signup.
Limiting Reagent Calculator
Limiting reagent calculator: identify the limiting reactant and theoretical yield from moles and a balanced equation. Free, private, runs locally, no signup.
Molar Mass Calculator
Molar mass calculator: compute molecular weight from any chemical formula using standard atomic weights, with a per-element mass breakdown. Free, no signup.
Molarity Calculator
Calculate molarity from moles and volume, with solution prep details. Free molarity with the formula shown - runs entirely in your browser, no signup.
Molarity from Mass Calculator
Molarity from mass calculator: convert grams of solute and molar mass into molar concentration in seconds. Free, editable units, runs locally in your browser.
Percent Solution Calculator
Percent solution calculator for w/v, v/v, and w/w concentrations: compute solute amount or solution strength instantly. Free, runs locally, no signup.
Percent Yield Calculator
Percent yield calculator: compare actual and theoretical yield from a chemistry reaction to get percent yield and reaction efficiency. Free, no signup.
Reaction Rate Calculator
Reaction rate calculator: find average reaction rate from concentration change over time, or predict rates from kinetics data. Free, runs locally, no signup.
Serial Dilution Calculator
Serial dilution calculator: work out dilution factor, tube concentrations, and transfer volumes step by step for lab work. Editable, free, runs locally.
Stoichiometry Calculator
Stoichiometry calculator: use mole ratios from a balanced equation to convert between reactant and product amounts in moles or grams. Free, runs in your browser.
Titration Calculator
Titration calculator: find solution molarity from titrant volume and concentration, with equivalence point handling. Free, runs in your browser, no signup.
pH Calculator
pH calculator: convert hydrogen ion concentration to pH and pOH, or convert pH back to concentration for acids and bases. Free, runs in your browser, no signup.