Atomic Mass Calculator
Calculate molecule atomic mass in seconds
Frequently Asked Questions
How precise are the calculations?
Our calculator uses standard atomic weights from the periodic table with up to 6 decimal places precision.
Can I calculate isotopic masses?
This calculator currently works with standard atomic masses. Isotopic calculations require our dedicated Isotope Calculator.
How to handle complex formulas?
Use standard chemical notation: H2O is H₂O, CO2 is CO₂. For complex molecules, use parentheses as needed.
Why is the result different from lab measurements?
Lab measurements may show variations due to isotopic composition differences. This tool shows standard atomic weights.
What elements are supported?
All elements from periodic table with standard atomic weights available in IUPAC data.
Can I export results?
Yes, use the “Save” feature or screenshot the results for documentation.
Is there a mobile app version?
Yes, download our “Science Toolkit” app from the App Store or Google Play.
Is my data saved?
No data is stored. All calculations are performed locally in your browser.
Can I calculate using atomic numbers?
Yes, use the “atomic number mode” by typing elements with their atomic numbers: (6)C(O16)2
How to use with WordPress?
Embed with Elementor’s HTML widget or paste the code directly in your WordPress page editor using the Text tab.