Moles Calculator

Convert between mass and moles using molar mass.

Amount (mol) 0.9992

Molecules 6.0171264879267275e+23

Formula: moles = mass ÷ molar mass

Step-by-step with your numbers:

1. Values used:

2. Mass = 18

3. Molar mass = 18.015 g/mol

5. Amount = Mass / Molar mass = 18 / 18.015 = 0.9992mol

6. Molecules = 6.0171264879267275e+23

Did we solve your problem today?

Find how many moles (and molecules) are in a given mass of a substance.

The math behind it

moles = mass ÷ molar mass. Multiply moles by Avogadro's number (6.022 × 10²³) for the molecule count.

18 g of water (molar mass 18.015) → ≈1 mol ≈ 6.02 × 10²³ molecules.

What is molar mass?

The mass of one mole of a substance in grams, equal to its formula/atomic weight.