What this is for: A working solution calculator over 123 common lab chemicals — pick a chemical and its formula, MW and CAS auto-fill; enter molarity and volume to get the weight to use.
The formula: mass (g) = molarity (mol/L) × volume (L) × MW (g/mol)
How to use:
- Pick a chemical from the dropdown in the Solution Calculator — formula, MW and CAS fill in automatically.
- Enter the concentration and volume you want to prepare; read off the mass in grams and milligrams.
- Or search the database table below by name, formula, MW or CAS number.
Solution Calculator — pick a chemical, get the mass to weigh
Pick a chemical from the dropdown — its formula, molecular weight (MW) and CAS number fill in automatically. Then enter the concentration and volume you want to prepare.
Formula
Molecular weight — MW (g/mol)
CAS number
MASS TO WEIGH OUT (g)
…the same mass in milligrams (mg)
The Database
Search the same table the workbook carries (name, formula, MW, CAS, form notes).
Prefer to work offline or keep a copy? The download link is right below.
Download the Chemicals Database workbook (.xlsx)
Download the Chemicals Database workbook (.xlsx)
Notes & limits (from the workbook): Mass = MW × concentration × volume. Check the hydrate form on your bottle: the database lists common forms separately (e.g. calcium chloride anhydrous vs dihydrate) and each has its own MW — pick the one you actually have. Entries flagged as liquids (e.g. glacial acetic acid, DMSO) are normally measured by volume, not weighed. A CAS shown as “—” means no CAS number is recorded for that entry. Purity is not corrected for.