How to calculate it
Divide rooms-department costs by room nights sold for the same period. The cost base may include departmental payroll, cleaning, linen, guest supplies and other relevant expenses under the report’s classification. Do not casually add restaurant expenses or whole-business costs to the same measure.
Keep the cost scope, currency, recognition period and treatment of complimentary stays consistent. This explanation uses sold room nights; an internal report using a different occupied-night count needs to identify that choice. With zero sold nights, CPOR is undefined even when expenses exist. The denominator is neither the number of reservations nor the number of guests.
A hypothetical example
For one month, the defined rooms-department expenses total €12,600 and 420 room nights are sold. CPOR is €30. If the same expense total is spread across 350 sold nights, it becomes €36. That increase comes from a smaller denominator, without any increase in the department’s total spending.
What a change can mean
CPOR can move because of supply prices, wage costs, service standards or occupancy. Stay length also affects the relationship between room nights and turnovers. To understand a change, examine expense categories, sold nights, arrivals and departures separately. A single average cannot distinguish a staffing change from a change in the mix of stays.
When it is useful
Use it to monitor operating costs and discuss work schedules or purchasing. Compare equivalent periods and properties offering similar service standards. A luxury room with extensive daily amenities and an apartment with a different cleaning schedule do not provide a useful like-for-like CPOR comparison without further analysis of what each operation delivers.
It is not automatically a minimum selling rate
Average CPOR is not necessarily the incremental cost of accepting one more booking. Some expenses remain fixed while others vary with volume, so it cannot set a selling-rate floor by itself. A falling CPOR does not prove improved operations either if the reduction comes from inadequate cleanliness or weaker guest service.