- Average Room Rate : Average Room Rate  is the total Room Revenue for a given period (day, month, month to date, year to date), divided by the number of rooms occupied for the same period.
The ADR is ratio that indicates average room rate, and to what extent rooms are being discounted or up-sold, and is frequently used as a measure of economic performance.
Other definition:
Average room rate is the total guest room revenue for a given period divided by the
number of rooms occupied for the same period.