Chemical working tools
Chemical calculators & CAS lookup tools
Check identifiers, compare records and calculate amounts.
Batch CAS validation
Batch CAS check
Check formatting, checksums and catalog matches.
Compare substances
Compare identifiers and molecular properties side by side.
Mass ↔ moles
Calculate amounts using a sourced molar mass.
Bring the right information together
Use the compare button on any record to build a side-by-side view of up to four substances. Export the result as CSV for your own notes.
Open comparison