Mass to Moles Converter
Convert between mass and amount of substance (moles) using molecular weight, and see the number of molecules.
Amount of substance
Working
About this tool
Convert a weighed mass into moles, or a required number of moles into the mass you need to weigh. Enter the molecular weight from a certificate of analysis or from the peptide molecular weight calculator.
How to use it
- Choose what to solve for.
- Enter the molecular weight in g/mol.
- Enter the known quantity and choose its unit.
Formula f(x)
n = m / M and m = n × M
where n is amount in moles, m is mass in grams and M is molar mass in g/mol. Number of molecules N = n × NA, with NA = 6.022 140 76 × 1023 mol−1 (exact).
Worked example check your setup
5 mg of GHK (M = 340.38 g/mol): n = 0.005 g ÷ 340.38 g/mol = 1.469 × 10−5 mol = 14.69 µmol, or about 8.85 × 1018 molecules.