Calculator
Molecular weight calculator
Type a formula like NaCl or Ca(NO3)2, or tap the elements one by one. Then take the molecular weight straight into the mass / molarity calculator.
Use in mass / molarity
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Decimals and rounding
Far left picks a sensible number of decimal places for each value.
How it works
The calculator adds up the atomic weights of every atom in the order you enter them and rounds to two decimals. It uses the same table as the Lab.hacks app, so a value you worked out on your phone matches this page.
Atomic weights are rounded standard values. For work that needs isotope accuracy, use the value from your supplier's certificate.