Is it common to have calculations behind reparations? What were the calculations for the reparations to the Japanese Americans interned during WWII? What were

Is it common to have calculations behind reparations? What were the calculations for the reparations to the Japanese Americans interned during WWII? What were the calculations for the reparations to the survivors and their descendants for the Rosewood massacre in Florida? Or for when California set aside $7.5 million in reparations for survivors of the state's (ex-) eugenics laws?