Molarity and mole calculator
Unit arithmetic between mass, amount of substance and molar concentration. You enter every number, including the molecular weight; nothing is pre-filled or suggested. Use a decimal point (2.5, not 2,5).
Mass and molecular weight to amount of substance (mol, mmol, µmol, nmol, pmol).
Result
Enter your numbers and choose Calculate.
Formulas
- Amount: mol = mass (g) ÷ molecular weight (g/mol).
- Mass: g = mol × molecular weight (g/mol).
- Molarity: mol/L = mol ÷ volume (L). 1 mM = 1000 µM.
- Mass for a molarity: g = mol/L × volume (L) × molecular weight (g/mol).
- Units: 1 g = 1000 mg = 10⁶ µg. 1 L = 1000 mL = 10⁶ µL.
The molecular weight is the value you type. The compound list only copies the molecular weight shown on each product page; for a salt form, use the formula mass of the form you actually weigh (see counter-ions in synthetic peptides).
Research use only. For laboratory research use only. Not for human or veterinary use. This page performs arithmetic on the numbers you enter and gives no recommendations about amounts. Check results against your own protocol and records. All laboratory tools · Laboratory guides · Glossary