ALOS (Average Length of Stay)

ALOS (Average Length of Stay) is the average number of nights a guest books per reservation. It's a key demand indicator and has a direct impact on operating costs and revenue per booking.

Formula

ALOS = Total Occupied Room Nights / Number of Bookings

Example

A hotel records 600 room nights from 200 bookings in a month. ALOS = 600 / 200 = 3.0 nights.

Why it matters

• Operating costs — Longer stays reduce check-in/check-out turnover and housekeeping costs per night.
• Revenue management — Properties use MinLOS restrictions to protect high-demand dates from single-night bookings that would block longer, more profitable reservations.
• Segment insight — Leisure markets tend to have longer ALOS than business destinations; tracking ALOS by channel reveals which OTAs bring longer-staying guests.