Convert between grams per mole and daltons, kilodaltons, or unified atomic mass units, with reverse conversion, scaled units, and per-particle mass.
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Daltons from g/mol Formula
For ordinary chemical calculations, the numerical molar mass in g/mol is approximately the particle mass in daltons. The amount of material in a sample is not needed.
Variables:
- D is the numerical mass per particle expressed in daltons (Da)
- M is the numerical molar mass expressed in g/mol
- 1 Da = 1 u; 1 kDa = 1000 Da
- For the SI relation, N_A = 6.02214076 × 10^23 mol^-1 exactly and m_u ≈ 1.66053906892 × 10^-27 kg per Da (CODATA 2022)
Use D ≈ M for the conventional numerical approximation. For the CODATA 2022 SI relation, use D = M / (1000 × N_A × m_u). The corresponding mass per particle in kilograms is M / (1000 × N_A). The measured molar-mass constant is approximately 1.00000000105 g/mol, so the usual one-to-one relation differs by about 1.05 parts per billion.
| Grams per mole (g/mol) | Daltons (Da) | Kilodaltons (kDa) |
|---|---|---|
| 1 | 1.000 | 0.001 |
| 5 | 5.000 | 0.005 |
| 10 | 10.000 | 0.010 |
| 18.015 | 18.015 | 0.018 |
| 28.014 | 28.014 | 0.028 |
| 32 | 32.000 | 0.032 |
| 44.01 | 44.010 | 0.044 |
| 58.44 | 58.440 | 0.058 |
| 98.079 | 98.079 | 0.098 |
| 180.156 | 180.156 | 0.180 |
| 342.296 | 342.296 | 0.342 |
| 500 | 500.000 | 0.500 |
| 1000 | 1000.000 | 1.000 |
| 5000 | 5000.000 | 5.000 |
| 10000 | 10000.000 | 10.000 |
| 20000 | 20000.000 | 20.000 |
| 50000 | 50000.000 | 50.000 |
| 100000 | 100000.000 | 100.000 |
| 150000 | 150000.000 | 150.000 |
| 300000 | 300000.000 | 300.000 |
| * Results rounded to 3 decimals using the conventional numerical approximation. The 1:1 g/mol-to-Da relation is not exact in the current SI; 1 kDa = 1000 Da exactly. | ||
How to Calculate Daltons from g/mol?
The following steps outline how to calculate the Daltons from g/mol.
- First, determine the molar mass in g/mol.
- Choose the conventional approximation or the CODATA 2022 SI relation; a sample mole count is not required.
- Use D ≈ M, or D = M / (1000 × N_A × m_u) for the measured SI relation.
- Apply the selected relation and convert Da to kDa, MDa or u if needed.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Molar mass M = 5 g/mol
The number of moles in a sample does not change the mass of an individual particle.
Using the conventional approximation, D ≈ 5 Da. Using CODATA 2022 central values, D ≈ 4.99999999 Da (8 decimal places).
