Average Length of Stay (ALOS)

Keep the counting basis consistent

For a room-based analysis, add the length of each selected room stay and divide by the number of those room stays. A reservation for two rooms creates two room stays. Do not divide room nights by guest count, or by group reservations containing different numbers of rooms.

Choose a consistent cohort, such as stays arriving within one month, and use their full lengths. When a stay crosses into the next month, do not count only the first month’s nights while retaining the same arrival count. State the treatment of cancellations and unfinished stays. With no eligible stays, the average is undefined.

A hypothetical example

Four stays, each using one room, last 2, 3, 5 and 6 nights. Their combined duration is 16 room nights, giving an ALOS of 4 nights. The result does not change because one room held a couple and another a solo traveller: the counting unit remains the room stay.

What the result tells you

The same number of room nights sold does not imply the same number of arrivals and departures. Many short stays may require more room turnovers, while fewer long stays create a different housekeeping and communication schedule. ALOS helps interpret that difference alongside actual operational records.

It also provides context when reviewing minimum-stay restrictions or gaps between reservations. The average cannot determine a suitable restriction by itself; demand patterns and the particular dates affected still matter.

When it helps operations

Compare average stay length by season and booking source to understand guest turnover. A decline can increase departures and cleaning work even when room nights sold stay unchanged. Review the distribution of stay lengths before changing minimum-stay restrictions.

An average is not a booking rule

An ALOS of four nights does not mean most bookings last four nights, nor that you should impose a four-night minimum. A few long stays can raise the average. Also examine how many stays fall into each length band, together with their achieved rates and associated costs.