Shorter average stays usually create more changeovers for the same number of occupied nights.
Hospitality glossary · Reservation metrics
Average Length of Stay (ALOS)
Definition
Average Length of Stay (ALOS) is the average number of nights guests stay per completed or relevant reservation during a period.
In plain English
What does ALOS mean?
ALOS answers: when a guest books, how many nights do they stay on average?
FormulaALOS = total occupied nights ÷ number of stays or reservations
The reservation population should be defined consistently, especially when excluding cancellations, no-shows, day-use stays, or partially completed stays.
Worked example
If 10 stays account for 35 occupied nights, ALOS = 35 ÷ 10 = 3.5 nights.
Operational meaning
Why it matters in hospitality operations.
Length of stay affects turnover frequency, cleaning workload, guest communication volume, channel economics, and how efficiently gaps between reservations can be managed.
See guest operations in HOS →How to interpret it
Keep the metric or concept attached to its operating context.
Definitions are useful when the underlying data and workflow boundaries stay consistent.
Minimum-stay rules and stay patterns can affect small unsellable gaps between bookings.
Longer stays can change average booking value even when ADR stays similar.
Longer stays may create different in-stay support, housekeeping, or maintenance needs.
Common mistakes
What not to assume.
01
Dividing total nights by available nights instead of number of stays.
02
Including cancelled reservations in the stay count.
03
Assuming longer stays are automatically more profitable.