Enter a mass (e.g., in grams (g)) into the Atomic Mass Units Calculator. The calculator will evaluate and display the equivalent mass expressed in atomic mass units (amu, also called daltons, Da).
Atomic Mass Units Formula
The following formula is used to calculate the Atomic Mass Units.
\text{AMU}=\frac{g}{1.66053906660\times10^{-24}}\approx g\times 6.02214076\times10^{23}- Where AMU is the number of atomic mass units (amu, also called Da)
- g is the total mass in grams (g)
To calculate atomic mass units from grams, divide the mass in grams by 1.66053906660×10⁻²⁴ g/amu (equivalently, multiply by approximately 6.02214076×10²³ amu/g).
| Atomic Mass Units (amu) | Grams (g) |
|---|---|
| 1.000 | 1.660539e-24 |
| 2.000 | 3.321078e-24 |
| 5.000 | 8.302695e-24 |
| 10.000 | 1.660539e-23 |
| 12.011 | 1.994473e-23 |
| 14.007 | 2.325917e-23 |
| 15.999 | 2.656696e-23 |
| 18.015 | 2.991461e-23 |
| 22.990 | 3.817579e-23 |
| 24.305 | 4.035940e-23 |
| 28.085 | 4.663624e-23 |
| 32.060 | 5.323688e-23 |
| 35.450 | 5.886611e-23 |
| 39.098 | 6.492376e-23 |
| 55.845 | 9.273280e-23 |
| 63.546 | 1.055206e-22 |
| 79.904 | 1.326837e-22 |
| 107.868 | 1.791190e-22 |
| 180.156 | 2.991561e-22 |
| 342.296 | 5.683959e-22 |
| * Values are shown in scientific notation and rounded to 6 significant figures. Note: 1 Da = 1 amu, and 1 amu = 1.66053906660×10⁻²⁴ g. Metric relations: 1 kg = 1000 g, 1 mg = 0.001 g. | |
How to Calculate Atomic Mass Units?
The following example problems outline how to calculate Atomic Mass Units.
Example Problem #1:
- First, determine the total mass in grams (g).
- The total mass in grams (g) is given as: 5.
- Finally, calculate the Atomic Mass Units using the equation above:
AMU = g / (1.66053906660e-24)
The values given above are inserted into the equation below and the solution is calculated:
AMU = 5 / (1.66053906660e-24) = 3.01107e+24 (amu)
Example Problem #2:
For this problem, the variables needed are provided below:
total mass in grams (g) = 8
This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer.
AMU = g / (1.66053906660e-24) = ?
