Molecular Weight Calculator
Calculate the molar mass and percentage composition of any chemical compound. Supports standard formulas with parentheses (e.g., C6H12O6, Fe2(SO4)3).
How to use the Molecular Weight Calculator
Enter a chemical formula to calculate its Molar Mass (often called Molecular Weight). The calculator sums the atomic masses of each element in the compound.
Supported Formats
- Elements: Use standard periodic table symbols. Case matters! (e.g.,
Cois Cobalt,COis Carbon + Oxygen). - Numbers: Subscripts indicate the number of atoms (e.g.,
H2Omeans 2 Hydrogen, 1 Oxygen). - Parentheses: Use brackets for groups. You can add a multiplier after the closing bracket (e.g.,
Mg(OH)2).
Examples
- Water:
H2O - Glucose:
C6H12O6 - Table Salt:
NaCl - Calcium Hydroxide:
Ca(OH)2 - Ammonium Sulfate:
(NH4)2SO4
What is Molar Mass?
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). A mole is a unit that represents $6.022 \times 10^23$ particles (Avogadro's number).
The calculation relies on the standard atomic weight of each element, which is the average mass of atoms of an element found in nature (accounting for isotopes).
? Frequently Asked Questions
Chemical symbols are case-sensitive. 'Co' refers to the element Cobalt. 'CO' refers to one atom of Carbon (C) and one atom of Oxygen (O).
This calculator uses standard atomic weights, which are weighted averages of natural isotopes. It does not support specific isotope selection (like Carbon-14).
Grams per mole. It means that if you have 1 mole (6.022 × 10²³ molecules) of the substance, it will weigh that many grams.