TLC diagram
Build TLC plate diagrams with lanes, spots, solvent front, Rf labels, and SVG/PNG export.
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Free Chemistry Tools, Converters and Calculators
Practical chemistry utilities for everyday lab work, learning, and structure workflows. Draw chemical structures online, open the chemical reaction drawer, convert XYZ to SMILES, browse name to structure, formula to structure, spectroscopy tools, mass spectrum predictor, XYZ/Gaussian to 2D structure, structure to SMILES, SMILES, IUPAC, InChI, CAS, PDB, PDBQT, MOL, SDF, and MOL2 converters plus pH, pKa, percent yield, grams to moles, molecular weight, Lipinski, druglikeness, LogP, TPSA, Lewis structure, periodic table, TLC, equation, and 3D structure tools.
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Interactive periodic table
All 118 elements with atomic mass, electron configuration, and key physical properties.
Open tableChemical equation balancer
Balance reactions with clear steps—homework, labs, and quick stoichiometry checks.
Open balancerChemical reaction drawer
Draw chemical reactions online with reactants, products, arrows, reagents, conditions, and editable examples.
Open reaction drawerLimiting reagent calculator
Find the limiting reactant, excess reagent, leftovers, and theoretical yield.
Open calculatorpH calculator
Calculate pH, pOH, concentration, strong acid/base pH, buffer pH, and pKa.
Open calculatorPDB to PDBQT
Upload PDB files or import PDB IDs, then generate a docking-ready PDBQT draft.
Open converterSMILES to Structure
Convert SMILES strings to 2D structures and export image files.
Open toolStructure to SMILES
Draw a molecule in the 2D editor and copy the realtime SMILES output.
Open toolChemical Reaction Drawer
Draw reaction schemes online with reactants, products, arrows, reagents, conditions, and editable examples.
Open toolName to Structure
Resolve compound names to a structure image, SMILES, formula, molecular weight, and PubChem CID.
Open toolMolecular Formula to Structure
Search PubChem by formula and compare candidate structures, names, CIDs, and SMILES.
Open toolSMILES to 3D Structure
Render molecules in 3D and download common chemistry and model formats.
Open toolXYZ / Gaussian to 2D Structure
Paste or upload XYZ and Gaussian coordinate files, infer bonds, and export a 2D structure image.
Open toolXYZ to SMILES
Paste or upload an XYZ coordinate file, infer likely bonds, review the editable structure, and copy best-effort SMILES.
Open toolProtein Viewer
Load proteins by PDB ID or file using 3Dmol.js with style and export controls.
Open toolMOL to SMILES Converter
Convert MOL/SDF structure blocks to SMILES in a dedicated converter page.
Open toolSMILES to PDB Converter
Convert a SMILES string to downloadable PDB for protein/model pipelines.
Open toolSMILES to PDBQT Converter
Generate docking-friendly PDBQT text from SMILES for AutoDock-style workflows.
Open toolPDB to PDBQT Converter
Convert PDB structures into PDBQT format in a dedicated browser tool page.
Open toolSMILES to InChI Converter
Generate standard InChI identifiers from SMILES strings.
Open toolSMILES to InChIKey Converter
Convert SMILES to compact InChIKey format for indexing.
Open toolInChI to SMILES Converter
Convert InChI strings from literature and databases to SMILES.
Open toolInChIKey to SMILES Converter
Resolve InChIKey identifiers to canonical SMILES via API.
Open toolSMILES to MOL Converter
Convert SMILES strings into MOL files for compatibility workflows.
Open toolSMILES to SDF Converter
Generate SDF output from SMILES for datasets and screening.
Open toolPDB to SMILES Converter
Convert ligand PDB blocks to SMILES in a best-effort workflow.
Open toolIUPAC Name to SMILES Converter
Convert chemical names to SMILES for structure workflows.
Open toolSMILES to IUPAC Name Converter
Convert SMILES strings into IUPAC names for reporting.
Open toolMOL2 to SMILES Converter
Convert MOL2 ligand blocks to SMILES format.
Open toolCID to SMILES Converter
Resolve PubChem CID values to canonical SMILES identifiers.
Open toolCAS Number to SMILES Converter
Resolve CAS Registry Numbers to SMILES, IUPAC name, formula, molecular weight, and CID.
Open toolCAS Number to Structure
Look up a CAS number and view the matching 2D chemical structure with metadata.
Open toolSMILES to MOL2 Converter
Convert SMILES into MOL2 format for docking and med-chem workflows.
Open toolSDF to InChI Converter
Convert SDF or MOL blocks into standard InChI identifiers.
Open toolSDF to InChIKey Converter
Convert SDF or MOL blocks into compact InChIKey strings.
Open toolInChI to InChIKey Converter
Generate compact InChIKeys from full InChI strings.
Open toolInChIKey to InChI Converter
Resolve InChIKey values to full InChI via public chemistry endpoints.
Open toolMOL to InChI Converter
Convert MOL or SDF structure blocks to standard InChI.
Open toolMOL to InChIKey Converter
Convert MOL or SDF blocks to compact InChIKey identifiers.
Open toolSolution Prep Calculator
Calculate exact solute amount needed for target molarity and solution volume.
Open toolDilution Calculator
Use C1V1=C2V2 workflow for quick dilution planning in dedicated page format.
Open toolMolarity Calculator
Compute molarity from mass, molecular weight, and final volume.
Open toolLimiting Reagent Calculator
Find the limiting reactant, excess reagent, leftover amounts, and theoretical yield.
Open toolGrams to Moles Calculator
Convert grams to moles or moles to grams using molar mass from a chemical formula.
Open toolPercent Yield Calculator
Calculate percent yield, actual yield, or theoretical yield with common unit support.
Open toolMolecular Weight Calculator
Calculate molar mass, element breakdown, and percent composition from a formula.
Open toolSMILES to Molecular Formula
Convert a SMILES string to formula with molecular weight and PubChem metadata.
Open toolSMILES to Molecular Weight
Calculate molecular weight from SMILES and show formula and compound metadata.
Open toolExact Mass Calculator
Calculate monoisotopic exact mass from a chemical formula for MS workflows.
Open toolMass Spectrum Predictor
Predict isotope pattern peaks, monoisotopic mass, average mass, and molecular ion region.
Open toolLipinski Rule Calculator
Check Rule of Five properties from SMILES or compound name: MW, LogP, HBD, and HBA.
Open toolDruglikeness Calculator
Calculate a simple Lipinski plus Veber-style druglikeness guideline score.
Open toolLogP Calculator
Retrieve PubChem XLogP from SMILES or compound name for hydrophobicity checks.
Open toolTPSA Calculator
Calculate topological polar surface area from SMILES or compound name.
Open toolpH Calculator
Calculate pH, pOH, concentrations, strong acid/base pH, buffer pH, and pKa.
Open toolpKa Calculator
Calculate pKa from pH, pH from pKa, or Henderson-Hasselbalch buffer ratios.
Open toolLewis Structure Generator
Generate Lewis dot structures from formula and charge with SVG download.
Open toolMolality Calculator
Compute molality from solute amount and solvent mass.
Open tool