# Average Length of Stay (ALOS) for Short-Term Rentals — Formula and Impact

> ALOS measures how many nights guests book on average. Learn how it affects your cleaning costs, RevPAR, and overall STR profitability.

Canonical: https://www.underwriteapp.com/learn/average-length-of-stay


## Definition

**Average length of stay** (ALOS) is the average number of nights per reservation over a given period. It measures how long guests typically book your property.

$$\text{ALOS} = \frac{\text{Total Nights Booked}}{\text{Number of Reservations}}$$

ALOS answers: **how many nights does a typical guest stay?**

Unlike [ADR](/learn/average-daily-rate) or [occupancy rate](/learn/occupancy-rate), ALOS is an operational metric as much as a financial one — it directly controls how often you turn over the property, which drives one of the largest variable costs in STR investing: cleaning.

## Formula

$$\text{ALOS} = \frac{\text{Total Nights Booked}}{\text{Number of Reservations}}$$

**Worked example — 2BR beach house, July:**

- 4 reservations in the month
- Reservation lengths: 7, 5, 7, 3 nights
- Total nights booked: 22
- **ALOS: 22 ÷ 4 = 5.5 nights**

Calculate ALOS monthly, then track it alongside occupancy and ADR to understand how your booking mix is evolving.

## Why ALOS Matters

### 1. Cleaning cost dilution

Cleaning is typically a fixed cost per turnover, not per night. A $150 cleaning fee spread over 7 nights costs $21/night. The same fee over 2 nights costs $75/night — 3.5× more expensive.

| Stay Length | Cleaning Fee | Cleaning Cost Per Night |
|-------------|-------------|------------------------|
| 2 nights    | $150        | $75.00                 |
| 4 nights    | $150        | $37.50                 |
| 7 nights    | $150        | $21.43                 |

Increasing ALOS from 2 to 4 nights cuts per-night cleaning costs in half. For a property with $200 ADR and 75% occupancy, that improvement alone can add thousands of dollars to annual NOI.

### 2. Platform booking fees

Most OTAs charge a per-reservation service fee rather than a per-night fee. Fewer, longer reservations mean fewer fee events for the same total revenue. This effect is modest for most operators but meaningful at high volume or for hosts paying premium placement costs.

### 3. Turnover labor and wear

Each turnover requires cleaning crew time, restocking supplies, and general wear on linens, furniture, and appliances. A higher ALOS reduces turnover frequency and extends the life of your inventory. Properties with ALOS below 2.5 nights often face accelerated maintenance costs.

## ALOS Trade-Off with Occupancy Rate

Longer stays don't automatically mean better performance. ALOS and [occupancy](/learn/occupancy-rate) trade off against each other in important ways.

**The gap problem:** A 7-night minimum stay policy can leave awkward 1–3 night gaps between reservations that go unfilled. A property with 85% occupancy on 3-night stays can outperform one with 60% occupancy on 7-night stays.

**The ADR tension:** Guests booking shorter stays often have higher willingness-to-pay per night. A business traveler booking 2 nights may accept $250/night; the same room on a 14-night booking might only clear $180/night.

The optimal ALOS isn't "as high as possible" — it's the length that maximizes [RevPAR](/learn/revpar) net of cleaning costs.

$$\text{RevPAR (net)} = \text{ADR} \times \text{Occupancy} - \frac{\text{Cleaning Fee}}{\text{ALOS}}$$

Run this calculation at different ALOS scenarios for your specific property to find the sweet spot.

## Industry Benchmarks by Market Type

ALOS varies significantly by market segment:

| Market Type | Typical ALOS | Driver |
|-------------|-------------|--------|
| Urban / city center | 2–3 nights | Weekend trips, corporate travel |
| Suburban / drive-to | 3–4 nights | Family getaways, bleisure |
| Mountain / ski | 4–7 nights | Ski week bookings, holiday demand |
| Beach / coastal | 5–8 nights | Summer week rentals |
| Rural / remote cabin | 3–5 nights | Nature retreats, couples |
| Luxury / estate | 5–10 nights | High-end travelers book longer |

Use these as starting points, not targets. Your local submarket may diverge significantly from these ranges. AirDNA and Rabbu both offer ALOS data by submarket and property type.

## How to Optimize ALOS

### 1. Set minimum stay policies by season

The most direct lever. Match your minimum stay to local demand patterns:

- **Peak weeks** (holidays, summer): 4–7 night minimums fill the calendar with long stays and screen out high-turnover short stays
- **Shoulder season**: 2–3 night minimums capture more demand without leaving gaps
- **Off-peak**: 1–2 night minimums prioritize fill rate over turnover reduction

Most dynamic pricing tools (PriceLabs, Wheelhouse) let you automate minimum stay rules by date range or demand signal.

### 2. Price shorter stays higher to discourage them

Rather than blocking 1-night bookings, price them at a meaningful premium — 30–50% above your base nightly rate. This preserves optionality (a last-minute 1-night booking at $350 beats an empty calendar) while naturally steering guests toward longer stays.

### 3. Offer longer-stay discounts strategically

Weekly and monthly discounts increase ALOS for demand-constrained periods. A 10% weekly discount that converts a 4-night stay into a 7-night stay typically wins on net: more total revenue, lower effective cleaning cost, and one fewer turnover. Model the math before setting discount levels — don't guess.

### 4. Target the right guest segments

Guests traveling for work, family reunions, or retreats book longer than weekend tourists. Positioning your listing for these segments — through photos, description, and amenity choices — shifts your booking mix toward longer stays organically.

## Common Mistakes

**Chasing ALOS at the expense of occupancy.** A 7-night minimum that drops occupancy from 80% to 55% almost always loses on RevPAR. Calculate the full impact before tightening restrictions.

**Ignoring cleaning cost in performance analysis.** [RevPAR](/learn/revpar) and [ADR](/learn/average-daily-rate) don't account for cleaning cost per night. A property with 3-night ALOS and $150 cleaning fees is more expensive to operate than one with 6-night ALOS and the same ADR. Always include cleaning costs when comparing strategies.

**Setting uniform minimum stays year-round.** Demand patterns change by season. A 4-night minimum that works in August can destroy fill rates in January. Use seasonal minimum stay rules.