How Many Grams is 1 Mole of Water?
1 mole of water (H₂O, molar mass 18.015 g/mol) has a mass of exactly 18.015 grams.
How to use this tool
- Enter amount (moles) and molar mass in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your mass and the full breakdown beneath it.
Calculate the mass of 1 mole of water using its molar mass of 18.015 g/mol.
Frequently asked questions
- What is a mole?
- A mole (mol) is 6.022×10²³ particles (Avogadro's number). It is the SI unit for amount of substance — the bridge between atomic and macroscopic scales.
- How do I find the molar mass?
- Add up the atomic masses of all atoms in the formula. H₂O: 2×1.008 + 15.999 = 18.015 g/mol. Use the IUPAC periodic table for accurate values.