1 Da = 1.66 yg (yoctograms), approximately. So that kinda works out. Another unit that is occasionally used for atomic scale masses is eV, as in electronvolt.

1 Da = 1.66 yg (yoctograms), approximately. So that kinda works out. Another unit that is occasionally used for atomic scale masses is eV, as in electronvolt. 1 Da = 0.93 GeV