OceanCalc

Molecular Weight Calculator

Calculate the molecular weight of chemical compounds from their formula.

Enter Chemical Formula

Enter formula like H2O, CO2, C6H12O6, NaCl

Quick Select:

Common Molecules
Periodic Table Reference
H
1.01
He
4.00
Li
6.94
Be
9.01
B
10.81
C
12.01
N
14.01
O
16.00
F
19.00
Ne
20.18
Na
22.99
Mg
24.30
Al
26.98
Si
28.09
P
30.97
S
32.06
Cl
35.45
Ar
39.95

Atomic weights in g/mol (amu)

Molecular Weight
H2O
Molecular Weight18.015 g/mol
Composition
H× 2
2.016 g/mol(11.19%)
O× 1
15.999 g/mol(88.81%)
Mass Distribution