Chemistry Calculators & Tools
Stoichiometry, Gas Laws, Solutions, Thermochemistry, and Organic Chemistry.
Chemistry calculations often involve moles, concentrations, and balanced relationships between substances. These tools take the bookkeeping off your plate and show the setup, so the chemistry stays clear even when the numbers get messy.
Acid-Base Titration Calculator
Calculate concentration from titration data. Get quick, accurate results with this free online calculator, including formulas and worked examples.
Activation Energy Calculator
Calculate activation energy using the Arrhenius equation.
Total Alkalinity Calculator
Calculate total alkalinity (mg/L as CaCO₃) from titration volume and normality.
Avogadro's Number Calculator
Convert between moles and number of particles. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Boiling Point Elevation Calculator
Calculate the boiling point elevation of a solution.
Boyle's Law Calculator
Calculate pressure or volume using Boyle's law (constant temperature). Fast, accurate, and free, with formula and example.
Buffer pH Calculator (Henderson-Hasselbalch)
Calculate buffer pH from pKa and the ratio of conjugate base to acid.
Buffer pH Calculator
Calculate buffer pH using Henderson-Hasselbalch equation.
Charles's Law Calculator
Calculate volume or temperature using Charles's law (constant pressure). Get instant results, the formula, and a clear example.
Chemical Dosing Calculator
Calculate chemical mass needed to dose a volume of water to a target concentration.
Chlorine Dosing Calculator
Calculate chlorine (or bleach) needed to reach a target free-chlorine dose in water.
Dilution Calculator
Calculate dilution using C₁V₁ = C₂V₂.
Electron Configuration Calculator
Generate electron configuration for elements.
Electronegativity Difference Calculator
Determine bond type from electronegativity difference.
Electroplating Calculator (Faraday's Law)
Calculate metal mass deposited during electroplating from current, time, and valence.
Empirical Formula Calculator
Determine the empirical formula from percent composition.
Enthalpy of Reaction Calculator
Calculate enthalpy change using Hess's law. A free, easy-to-use calculator giving instant results plus the formula and a step-by-step example.
Equilibrium Constant Calculator
Calculate the equilibrium constant Kc or Kp.
Freezing Point Depression Calculator
Calculate the freezing point depression of a solution.
Gibbs Free Energy Calculator
Calculate Gibbs free energy change.
Half-Life Calculator (Chemistry)
Calculate radioactive or chemical half-life.
Ideal Gas Law Calculator (PV = nRT)
ideal gas law calculator. Solve for pressure, volume, temperature, or moles using PV = nRT.
Octet Rule Calculator
Calculate electrons needed for the octet rule.
Limiting Reactant Calculator
Find the limiting reactant from moles and stoichiometric coefficients.
Mass to Moles Converter
Convert between mass and moles.
Mass Percent Calculator
Calculate mass percent composition: (mass of component / total mass) × 100%.
Molality Calculator
Calculate the molality of a solution.
Molar Mass Calculator
Calculate the molar mass of common compounds.
Molarity Calculator
Calculate the molarity of a solution.
Moles Calculator
Convert between mass, molar mass, and moles using n = m / M.
Nernst Equation Calculator
Calculate cell potential under non-standard conditions.
Osmotic Pressure Calculator
Calculate the osmotic pressure of a solution.
Oxidation Number Calculator
Calculate oxidation states in compounds.
Percent Composition Calculator
Calculate the percent composition of elements in a compound.
pH Calculator
Calculate pH, pOH, [H⁺], and [OH⁻] from any one value.
pH Adjustment Calculator
Estimate acid or base needed to shift solution pH, and find [H⁺] from pH. Free, accurate results with step-by-step explanations.
PPM / PPB Calculator
Convert concentrations between ppm, ppb, percent, and mg/L.
Purity Calculator
Calculate the percent purity of a sample from pure mass and total sample mass.
Radioactive Decay Calculator
Calculate remaining radioactive material.
Rate Law Calculator
Calculate reaction rate from rate law expression.
Reaction Rate Calculator
Calculate reaction rate from concentration changes.
Solubility Product (Ksp) Calculator
Calculate solubility from Ksp.
Solution Mixing Calculator
Calculate the final concentration when mixing two solutions.
Specific Heat Calculator
Calculate heat transfer using q = mcΔT.
Stoichiometry Calculator
Calculate amounts in chemical reactions using mole ratios.
Theoretical Yield Calculator
Calculate theoretical and percent yield.
Water Hardness Calculator
Convert water hardness between mg/L (ppm) as CaCO₃, grains per gallon, and degrees.
How to choose the right Chemistry tool
- Converting between mass, moles, and particles? Use the stoichiometry tools.
- Mixing or diluting solutions? The molarity and dilution calculators handle that.
- Working with gases? Reach for the gas law tools and keep temperature in kelvin.
- Acid and base questions usually start with the pH and concentration calculators.
Who these tools are for
For chemistry students, lab prep, and teachers who want a quick way to verify a worked example.
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Explore Other Categories
Popular tools from our other scientific categories
Absolute Value Calculator
Calculate the absolute value of any number. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
AC to DC Converter Calculator
Convert AC voltage to DC voltage for different rectifier configurations. Free online calculator with instant, step-by-step results.
ABV Calculator
Calculate alcohol by volume from original and final gravity. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Amortization Schedule Calculator - Free Online
Free Generate a complete amortization schedule. Step-by-step solutions and formulas included. Free, accurate results with step-by-step explanations.
Average Cost Basis Calculator - Free Online
Free Calculate average cost per share. Step-by-step solutions and formulas included. Fast, accurate, and free, with formula and example.
1031 Exchange Calculator - Free Online
Free Calculate tax deferral in a 1031 exchange. Step-by-step solutions and formulas included. Fast, accurate, and free, with formula and example.
A1C Calculator - Free Online
Free Convert between A1C percentage and estimated average glucose. Step-by-step solutions and formulas included. Simple, fast, and free.
Batting Average Calculator
Calculate batting average in baseball/cricket. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Air Density Calculator
Calculate air density from temperature and pressure using the ideal gas law. Fast, accurate, and free, with formula and example.
Age Calculator
Calculate exact age in years, months, and days. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
Acceleration Converter
Convert between acceleration units. Get quick, accurate results with this free online converter, including formulas and worked examples.
Circle Area Calculator
Calculate the area and circumference of a circle. Free online calculator with instant results, step-by-step explanations, and a clear worked example.
Angle Between Two Lines Calculator
Calculate the angle between two lines given their slopes. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Apache Log Parser, Free Online Developer Tool
Parse Apache/NGINX combined access log lines into IP, time, request, status and size fields. Get instant results, the formula, and a clear example.
Add Text to Beginning, Free Online Text Tool
Add custom text to the beginning of every line in your text instantly. Get instant results, the formula, and a clear example.
Accessible Color Pair Finder
Check if a text/background pair meets WCAG and suggest a fix. Free tool with instant calculations, the underlying formula, and an easy-to-follow example.