Chemistry

Chemistry Calculators & Laboratory Tools

Solve common chemistry and laboratory calculations with 26 focused tools. Formula parsing, unit conversion and supported calculations run locally in your browser.

I want to explore element properties in an interactive periodic table I need to calculate Molecular Weight / Molar Mass I need to calculate Molarity Dilution Calculator — C₁V₁ = C₂V₂ I need to calculate Stoichiometry Chemical Equation Balancer 2D Molecule Sketcher FTIR, UV-Vis & NMR Spectra Predictor

39 Chemistry Tools

Calculate molar mass, molarity, dilutions, stoichiometry, pH, buffers, gas laws and other laboratory quantities locally in your browser.

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I want to explore element properties in an interactive periodic table

Explore all 118 elements by atomic number, symbol, atomic mass, group, period, category, phase and atomic radii.

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I need to calculate Molecular Weight / Molar Mass

Calculate molar mass from a chemical formula with parentheses, brackets and hydrate notation, plus element-by-element mass percentages.

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I need to calculate Molarity

Calculate molarity from mass or moles and solution volume, or calculate the solute mass needed for a target molarity.

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I need to calculate Molality

Calculate molality from solute mass, molar mass and solvent mass in kilograms.

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I need to calculate Normality

Calculate normality from molarity and the reaction-specific equivalent or n-factor.

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Dilution Calculator — C₁V₁ = C₂V₂

Solve any missing concentration or volume in the dilution equation C₁V₁ = C₂V₂ with automatic unit conversion.

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I need to calculate Solution Preparation

Calculate how many grams of a compound to weigh for a target molarity and final volume, with an optional purity correction.

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Mass ↔ Moles Calculator

Convert grams or other mass units to moles and moles back to mass using the formula-derived molar mass.

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Moles ↔ Molecules / Particles Calculator

Convert between moles and molecules, atoms, formula units or other particles using the exact Avogadro constant.

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I need to calculate Stoichiometry

Balance a reaction and convert a known reactant or product amount into moles and grams of another species using stoichiometric coefficients.

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I need to calculate Limiting Reagent

Find the limiting reagent from a balanced reaction and reactant amounts, then calculate product theoretical yields and leftover reactants.

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I need to calculate Theoretical Yield

Calculate the maximum theoretical product yield from a limiting reactant amount and a balanced chemical equation.

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I need to calculate Percent Yield

Calculate percent yield from actual and theoretical yield and flag results above 100% for review.

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Chemical Equation Balancer

Balance neutral chemical equations with the smallest whole-number coefficients and verify element conservation.

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I need to calculate Percent Composition

Calculate each element’s mass contribution and mass percent from a chemical formula.

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I need to calculate Empirical Formula

Determine an empirical formula from elemental masses or mass percentages by converting to mole ratios and integer subscripts.

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I need to calculate Molecular Formula

Calculate a molecular formula from an empirical formula and measured molar mass using the nearest whole-number multiplier.

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I need to calculate pH / pOH

Convert among pH, pOH, hydrogen-ion concentration and hydroxide-ion concentration using Kw = 1.0×10⁻¹⁴ at 25 °C.

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I need to calculate Henderson–Hasselbalch

Calculate buffer pH from pKa and the conjugate-base to weak-acid concentration ratio.

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I need to calculate Buffer Preparation

Calculate acid/base mole amounts for a target buffer pH, pKa, total concentration and volume, with optional masses from molar weights.

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I need to calculate Acid–Base Titration

Calculate the titrant volume required at equivalence from acid/base molarity, analyte volume and stoichiometric equivalent factors.

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I need to calculate Beer–Lambert Law

Solve A = εbc for absorbance, molar absorptivity, path length or concentration by leaving one field blank.

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I need to calculate Serial Dilution

Generate concentration and cumulative dilution factor for each step of a repeated serial dilution.

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I need to calculate PPM / PPB / PPT Concentration

Calculate ppm from solute and total mixture mass, or convert ppm, ppb, ppt, percent and mg/L.

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I need to calculate Ideal Gas Law

Solve PV = nRT for pressure, volume, moles or absolute temperature with pressure and volume unit conversion.

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I need to calculate Nernst Equation

Calculate a non-standard electrochemical cell or electrode potential from E°, electron count, reaction quotient and temperature.

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I need to view SMILES

Render a SMILES string as a 2D structure and generate an interactive 3D conformer locally in your browser.

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2D Molecule Sketcher

Draw chemical structures in a browser-based 2D molecule editor and get a live SMILES string while you edit.

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SMILES to MOL2 Converter

Convert one or many SMILES strings to 3D MOL2 locally, with bulk ZIP and combined-file output.

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I need to view Molecular Structure

Open MOL2, SDF, PDB and XYZ molecular structures locally in an interactive 3D viewer.

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SMILES to SDF Converter

Convert single or bulk SMILES to 3D SDF files locally in your browser, then download combined SDF or ZIP.

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SDF to MOL2 Converter

Convert single or multi-record SDF files to MOL2 locally while preserving coordinates and connectivity.

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MOL2 to PDB Converter

Convert single or bulk MOL2 structures to PDB locally, preserving atom coordinates and connectivity where possible.

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SDF to PDB Converter

Convert single or multi-record SDF files to PDB locally without changing the stored coordinates.

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Molecule to XYZ Converter

Convert SMILES, SDF, MOL2 or PDB to XYZ locally, one structure or many at once. XYZ is output-only.

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FTIR, UV-Vis & NMR Spectra Predictor

Draw or load a molecule and predict approximate FTIR, UV-Vis and 1H/13C NMR spectra directly in your browser.

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I want to check Basic SMILES Syntax

Free browser-based Basic SMILES Syntax Validator. Process sequence data locally without uploading it to a server.

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SMILES Deduplicator (Exact)

Free browser-based SMILES Deduplicator (Exact). Process sequence data locally without uploading it to a server.

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I need to extract SMILES Salt Stripper / Largest Fragment

Free browser-based SMILES Salt Stripper / Largest Fragment Extractor. Process sequence data locally without uploading it to a server.

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Frequently asked questions

Which chemistry calculations are available?

The collection covers periodic-table lookup, molar mass, concentration and dilution, stoichiometry and yields, acid–base calculations, spectroscopy, gas laws and electrochemistry.

Do these chemistry calculators upload my values?

No. The chemistry calculators in this collection run with local JavaScript in your browser.

Can I use the tools for laboratory preparation?

Yes for calculation and planning, but always follow your laboratory SOPs, reagent specifications, safety data and required measurement practices.

About this tool

Free chemistry calculators for molar mass, molarity, dilution, stoichiometry, equation balancing, pH, buffers, titration, gas laws and electrochemistry. Browser-based and no signup.

Toolardo chemistry tools are calculation aids. For laboratory work, verify reagent form, purity, temperature-dependent constants, activity corrections and your local SOP before using a calculated value operationally.