Molecular Weight Calculator
Calculate molecular weight from chemical formula
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How to Use Molecular Weight Calculator
Enter formula
Type a chemical formula (e.g., H2O, NaCl).
Calculate
See molecular weight in g/mol.
Details
View element breakdown and percentages.
Why Choose AllTools Molecular Weight Calculator?
- ✓ Formula parsing
- ✓ 118 elements
- ✓ Element breakdown
- ✓ Mass percentages
- ✓ Common formulas
- ✓ No data stored
Why Use This Tool
- ★ All calculations happen locally in your browser
- ★ Completely free with no usage limits
- ★ No account or registration required
- ★ Based on established scientific formulas and constants
- ★ Works on any device with a modern browser
Related Resources
Frequently Asked Questions
What formulas are supported? ▼
Standard chemical formulas like H2O, NaCl, C6H12O6, Ca(OH)2. Parentheses and subscripts are supported.
Can I use parentheses in formulas? ▼
Yes. Formulas like Ca(OH)2 and Mg3(PO4)2 are fully supported. The parser handles nested parentheses and subscripts correctly.
Does this work on mobile? ▼
Yes. All AllTools tools are fully responsive and work on phones and tablets.
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