ToolsFree chemistry calculators
Chemistry tools, on the house.
Six fast, accurate calculators for the bench and the buying desk — molecular weight, molarity, dilution, solution prep, CAS validation and unit conversion. No sign-up, no ads.
Mr
Molecular Weight Calculator
Chemical formula → molar mass (g/mol)
Open tool →MMolarity Calculator
Mass ↔ molarity ↔ volume
Open tool →C₁V₁Dilution Calculator
C₁V₁ = C₂V₂ — find any unknown
Open tool →w/vSolution Preparation Calculator
Grams for % (w/v), molar & ppm solutions
Open tool →CASCAS Number Validator
Verify a CAS Registry Number's check digit
Open tool →⇄Chemistry Unit Converter
Mass ↔ moles, and concentration units
Open tool →Built by a chemical supplier
Tech Serve Solutions has supplied laboratory reagents, fine chemicals and pharmaceutical intermediates to USP, BP and EP grade since 1998. These calculators use standard IUPAC atomic weights and the exact formulae you would use at the bench — so the numbers match your Certificate of Analysis and your prep notes.