Dalton (Da) to g/mol Converter
Enter a value in daltons to convert it to grams per mole.
Tip: You can press Enter in the input field to run the calculation.
What does dalton to g/mol mean?
In chemistry and biochemistry, molecular masses are often listed in daltons (Da), while laboratory calculations involving moles usually use grams per mole (g/mol). The useful thing is that these values are numerically the same.
That means if a molecule has a mass of 342.30 Da, its molar mass is 342.30 g/mol.
Why the numbers are identical
A dalton is defined from the unified atomic mass unit (u), and molar mass is linked through Avogadro’s number. Because of how these units are defined in modern SI, the conversion between Da and g/mol is a direct 1:1 relationship:
So this is not an approximation for everyday chemistry work—it is the standard direct conversion used in textbooks, lab reports, and molecular biology protocols.
How to use this calculator
- Type your molecular mass value in daltons.
- Click Convert to g/mol.
- Read the converted value (same number, new unit).
- Optional: check the kDa value shown for large biomolecules.
Quick examples
| Value in Da | Value in g/mol | Common context |
|---|---|---|
| 18.015 | 18.015 | Water (H₂O) |
| 180.156 | 180.156 | Glucose |
| 58,440 | 58,440 | Approx. albumin protein mass |
| 150,000 | 150,000 | Typical monoclonal antibody range |
When to use Da, kDa, and g/mol
Dalton (Da)
Common in molecular biology, mass spectrometry, and protein databases.
Kilodalton (kDa)
Used for large molecules. 1 kDa = 1000 Da. Great for proteins and complexes.
g/mol
Used in stoichiometry, solution prep, and chemical equations where moles are explicit.
Common mistakes to avoid
- Changing the numeric value: You do not multiply or divide between Da and g/mol.
- Confusing Da with grams: Da is not the mass of a sample; it is unit mass per molecule-scale reference.
- Forgetting scientific notation: Very large biomolecules are often easier to read in exponential form or kDa.
FAQ
Is 1 dalton exactly 1 g/mol?
Yes—numerically, for practical chemistry usage, 1 Da corresponds directly to 1 g/mol.
Can I use this for proteins and DNA fragments?
Absolutely. Enter the mass in Da and read the equivalent molar mass in g/mol.
Why does the calculator still help if it is 1:1?
It reduces mistakes, provides clean formatting, and gives quick context values like kDa for large molecules.
Bottom line
Converting daltons to g/mol is simple: keep the same number and change only the unit label. Use the calculator above for quick, error-free conversions during lab work, class assignments, and report writing.