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Molar Mass Calculator

Calculate the molar mass of a compound by entering atom counts for up to 9 common elements using IUPAC standard atomic weights.

Atomic mass: 12.011 g/mol
Atomic mass: 1.008 g/mol
Atomic mass: 15.999 g/mol
Atomic mass: 14.007 g/mol
Atomic mass: 32.06 g/mol
Atomic mass: 30.974 g/mol
Atomic mass: 35.45 g/mol
Atomic mass: 22.990 g/mol
Atomic mass: 40.078 g/mol

Results

Molar Mass180.156 g/mol

📖What is it?

Molar mass (g/mol) is the mass of one mole (6.022 x 10^23 molecules) of a compound. It equals the sum of atomic masses of all atoms in the molecular formula, using IUPAC 2021 standard atomic weights.

🎯How to use

Enter the number of atoms of each element in your molecule. For glucose (C6H12O6): C=6, H=12, O=6 -- giving 180.156 g/mol. Set all unused elements to 0.

💡Example scenario

Aspirin (C9H8O4): C=9, H=8, O=4 -> 9x12.011 + 8x1.008 + 4x15.999 = 108.099 + 8.064 + 63.996 = 180.159 g/mol. ATP (C10H16N5O13P3): C=10, H=16, N=5, O=13, P=3 -> 507.181 g/mol.

🏆Pro tip

Molar mass is used to convert between grams and moles: moles = mass(g) / molar mass. For ionic compounds, use the formula unit mass. Note: these are monoisotopic masses averaged over natural isotope abundances -- mass spectrometry uses monoisotopic masses instead. For proteins, divide molecular weight (Da) by 1000 to get kDa.