Laboratory Stock, Aliquot & Molar Calculator
Plan in-vitro stock solutions from the reference-material mass and solvent volume. Add a target aliquot for its transfer volume, and molecular weight for molar amount and concentration. For laboratory planning only - research use, not for human or animal use.
For in-vitro laboratory stock preparation and aliquot planning only. Use the verified molecular weight and net content for the exact material and salt form.
Calculation method
Stock concentration is vial mass in milligrams divided by solvent volume in millilitres. Results are nominal and use the volume of solvent added; they do not account for solute-volume displacement. Aliquot volume is the target mass divided by that stock concentration after converting micrograms to milligrams. When molecular weight is supplied, molar amount is calculated from mass divided by molecular weight and molar concentration from that amount divided by solution volume.
Worked example: 10 mg in 2 mL gives 5 mg/mL. A 250 microgram aliquot is 0.25 mg, so it requires 0.05 mL, or 50 microlitres. At a molecular weight of 1419.56 g/mol, the same vial contains about 7.04 micromoles and the 2 mL stock is about 3.52 mM.