This is not really hard to confirm if you’re not aware of it:
In standard top/left/right modes, middle click, it’s a measuring tool. This screen below is a placeholder event in the default map at 1/20 attenuation (on the main macros) with the measuring tool for the reference.
Now, at that distance, if I’m testing this ingame, the volume is already quite low between 12 to 15 (1200 to 1500 UU). But with a curve like that it’s pretty normal : )
Thing is, either the macro attenuation or the override attenuation are both just a portion of the volume control. You could have automations in your sequencer which could also have influence on your volume.
At least, what I can say is, with the default setup and normal configuration of both UE5 and FMOD, the conversion of UU to FMOD Units is /100.