Free Online Chemistry Calculators
Solve chemistry problems instantly with our suite of free calculators. From molar mass and stoichiometry to pH, gas laws, and molecular visualization — built for students, educators, and researchers.
Chemistry Tools
Molecule Viewer
Visualize 2D molecular structures and view properties like molecular weight, LogP, atom count, and SMILES notation. Supports molecule names and SMILES input.
Stoichiometry Calculator
Calculate amounts of reactants and products in chemical reactions. Convert between grams, moles, and liters with step-by-step solutions.
Molar Mass Calculator
Calculate molecular weight of any chemical compound with a full element-by-element breakdown showing mass contribution and percentage.
Equation Balancer
Automatically balance any chemical equation. Enter unbalanced equations and get perfectly balanced results instantly.
Reaction Predictor
Predict products from reactants for combustion, acid-base, synthesis, decomposition, and replacement reactions.
Dilution Calculator
Solve C1V1 = C2V2 dilution problems. Enter any three values to calculate the fourth for solution preparation.
pH Calculator
Calculate pH, pOH, hydrogen ion and hydroxide ion concentrations. Works from concentration or pH value input.
Gas Law Calculator
Solve ideal gas law problems using PV = nRT. Enter any three of pressure, volume, moles, and temperature to find the fourth.
Why Use ChemistryGo?
Accurate Results
Powered by RDKit and ChemPy, our calculators use the same scientific libraries trusted by researchers worldwide.
Step-by-Step Solutions
Our stoichiometry and gas law calculators show detailed solution steps so you can learn the process, not just the answer.
No Sign-Up Required
All calculators are completely free with no registration and no usage limits.
Works on Any Device
Responsive design means you can use ChemistryGo on your phone, tablet, or desktop anywhere you study.
Frequently asked questions
Is ChemistryGo really free?
Yes. Every calculator is free, there is no account to create, and no result is hidden behind a signup form or a payment. The site is supported by advertising rather than by charging for the tools.
How accurate are the calculators?
The calculations are performed by established scientific libraries, RDKit and ChemPy, using standard IUPAC atomic weights, so results match what a textbook method would give. Each calculator states the assumptions it makes, such as complete dissociation for strong acids or ideal behaviour for gases, and results are valid within those assumptions.
Can I use ChemistryGo for my homework or coursework?
Yes, and the explanatory sections are written with that in mind. Where a calculator shows its working, following the steps is a faster way to learn the method than reading the answer alone. Check your institution's policy on calculation aids if you are unsure what is permitted.
Can I use these calculators for laboratory work?
They are a useful check, but they are a study and reference aid rather than validated laboratory software. Anything consequential, particularly the preparation of a reagent or any decision with a safety dimension, should be verified independently and follow your institution's procedures.
How do I report an error or suggest a calculator?
Write to contact@chemistrygo.com. Reports of incorrect results are dealt with first. Including the exact inputs you used and the answer you expected, along with where that expected value came from, makes a report far quicker to act on.