Research use only · laboratory education · not for human or veterinary use

Calculator

Molarity, dilution, and units

Move from a mass concentration to millimolarity, dilute a stock, plan a short dilution series, or convert mg, µg, mL, µL, mM, and µM. Every result stays in laboratory units.

Molarity

Use the g/mol value from the supplier or a reference database.

Enter mass, molecular weight, and volume.

Single dilution

Keep one concentration unit and one volume unit for every field. The tool only dilutes.

Enter stock concentration, stock volume, and target concentration.

Serial dilution

A factor of 10 makes each step one tenth of the previous concentration.

Mass remaining

Useful when a labeled stock is partly used and you need the mass still in the container.

Unit conversion

mg/mL and µg/µL are the same number. 1 mg = 1,000 µg. 1 mL = 1,000 µL. 1 mM = 1,000 µM.

Need only mass over volume? Use the concentration calculator. The formulas are on the lab math page.