Convert grams, kilograms, or milligrams to atomic mass units or moles, and calculate mass or molar mass from moles and g/mol values.
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) = ?
