Result
Tip: edit atomic weights below to reflect isotopes.
Total molar mass: 0 g/mol
Formula parsed:
Distinct elements: 0
Mass percent shown to selected precision.
| Element | Count | Atomic weight (g/mol) | Mass contribution (g/mol) | % by mass |
|---|---|---|---|---|
| Total | 0 | 100.00 | ||
Override atomic weights
Adjust values for isotopic labeling or standards. Changes persist in this session and export.
Example data
| Compound | Formula | Molar mass (g/mol) |
|---|
Click Use to load the formula into the calculator.
Common compounds reference
| Compound | Formula | Molar mass (g/mol) |
|---|
Atomic weights snapshot
| Element | Atomic weight (g/mol) |
|---|
Grouping and hydration examples
| Example | Interpretation | Molar mass (g/mol) |
|---|
Use any row to prefill the calculator and verify parsing behavior.
Formula used
The molar mass of a compound is the sum over elements of ni·Ar,i, where ni is the count of atoms of element i, and Ar,i is its relative atomic mass.
Parentheses and brackets denote grouped subunits with multipliers applied after the group. Hydration dots (·) split formula parts whose molar masses are additive.
How to use
- Enter a chemical formula, e.g., Al2(SO4)3·18H2O or K4[Fe(CN)6].
- Choose decimal places and press Calculate.
- Review per-element breakdown; optionally override atomic weights for isotopic labeling.
- Export your results as CSV or PDF, or copy a shareable link.
Notes: Values use standard atomic weights. For a specific isotope, override the atomic weight accordingly.