# Is formula mass measured in atomic mass units (amu)?

....but most of the time we report formula mass in grams... Chemists usually work in gram quantities, and there is a relationship between $\text{amu}$ and $\text{grams}$; the constant of proportionality is $\text{Avogadro's number}$....where $6.022 \times {10}^{24} \cdot \text{amu} \cong 1 \cdot g$