Laboratory math
Concentration and molarity calculators for peptide research
Turn vial mass and diluent volume into mg/mL, µg/µL, and millimolarity. The formulas are on the page. The results are laboratory quantities.
Concentration
Mass divided by diluent volume, plus an optional aliquot volume in microliters.
Molarity and dilution
Millimolarity, a single dilution, a serial dilution, remaining mass, and unit conversion.
Storage reference
How laboratories label stocks, and why the COA still controls the compound in front of you.
mg/mL = mass (mg) ÷ volume (mL) · mg/mL = µg/µL · mM = (grams ÷ g/mol) ÷ liters × 1,000
Questions
Is this a calculator for human administration?
No. It reports laboratory concentration, molarity, and volume from mass, diluent volume, and molecular weight. It does not produce an administration quantity.
Why is mg/mL the same number as µg/µL?
One milligram per milliliter is one microgram per microliter. Both describe the same concentration. The calculator shows both so the unit change is visible.
Are my entries stored?
Calculator entries stay in the browser. An email address is stored only if you submit a newsletter, checklist, or quote form.
Weekly laboratory notes
Methods, documentation, and testing practice. Not a mailing until you confirm, and not until the email platform is connected.