12 free tools
Free chemistry tools and calculators
Quick, accurate calculators and references for lab, quality and trade work. Each one shows its working and explains the maths, runs in your browser and needs no sign-up.
- Free for everyone, no account needed
- Your numbers stay in your browser
- Worked examples with every tool
Lab calculators
Molar mass, solutions, dilutions, buffers and purity, worked out step by step
- Molecular weight calculatorMolar mass from any formula, with hydrates and bracketsNested parentheses and bracketsHydrates and adductsPer element mass percent
- Molarity calculatorMass, volume and concentration of a solutionSolve for mass, molarity or volumeMolar mass from formulaPurity correction
- Dilution calculatorC1V1 equals C2V2, solved for any valueSolve for C1, V1, C2 or V2Diluent volume and dilution factorSerial dilution planner
- Buffer and pH calculatorHenderson-Hasselbalch recipes and pH mathspH from acid and base amountsRecipe for a target pH in gramsCommon buffer pKa presets
- Purity and assay calculatorPercent purity, titration assay and basis conversionPercent purityTitration assayAs is, dried and anhydrous basis
Converters
Units, concentrations and densities used in labs, plants and trade documents
- Unit converterMass, volume, concentration, temperature, pressureMass including metric tonsVolume including drums and IBCsMolar and mass concentration
- Mass percent and ppm converterPercent, ppm, ppb, mg/kg and mg/LPercent, per mille, ppm, ppb, pptmg/kg and mg/LDensity correction
- Density and specific gravity converterg/mL, kg/m³, lb/gal, SG, Baumé and APIDensity unitsSpecific gravityBaumé and API gravity
Lookups and validators
Check identifiers and find customs codes before you quote or ship
Reference guides
Interactive guides to hazard labels and international trade terms
More ways to look things up
Search tools elsewhere on CompoundList that work on our chemical and trade database
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