Scientific calculators

Solution Preparation Calculator

Required solute mass for a target concentration and final volume, by molarity or mass concentration.

By molarity

mass = concentration × final volume × molecular weight. Supply the molecular weight either directly or as a chemical formula — not both.

Target concentration

Unit

Final volume

Unit

Molecular weight — one source only

Direct value (g/mol)

Or chemical formula

Formulas are calculated from CIAAW standard atomic weights; the formula you enter (including any hydrate) is authoritative for the calculation.

By mass concentration

mass = mass concentration × final volume. No molecular weight is required.

Target concentration

Unit

Final volume

Unit

Related tools: Molecular Weight Calculator · Dilution Calculator (diluting an existing stock has its own calculator — this tool prepares from solid solute).