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What is Depth of Inventory?

Updated 2026-07-23

Depth of Inventory is a reporting metric that quantifies the total supply of available nights for a given set of properties over a specific period. It is calculated by multiplying the number of properties by the number of nights in the period.

For example, a single property has an inventory depth of 365 nights over a full year. This figure represents the total potential for bookings and serves as a fundamental component for calculating other key performance indicators, most notably the occupancy rate, which measures booked nights as a percentage of this total available inventory.

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How it works

The calculation for depth of inventory is straightforward: Number of Properties × Number of Nights in Period. For a single property over a 30-day month, the inventory depth is 30.

For a portfolio of 50 properties, the depth for that same month is 1,500 (50 × 30). Market-level data providers like AirDNA and KeyData Dashboard use this metric at a larger scale, aggregating the available nights from thousands of listings to analyze total market supply, which can fluctuate as new properties enter or leave the market.

Why it matters

For property managers, understanding depth of inventory is essential for contextualizing performance. It forms the basis for calculating critical metrics like occupancy rate and RevPAR.

By tracking their own inventory depth against the broader market's, managers can accurately benchmark their performance, understand their market share, and identify trends in supply that may impact their pricing and marketing strategies. More details on key metrics can be found in this guide to vacation rental KPIs.

Examples

  • A single cabin rental available for the entire month of August (31 days) has a depth of inventory of 31 available nights.
  • A property management company with a portfolio of 40 units has a total depth of inventory of 1,200 available nights for the month of June (40 units × 30 days).
  • If a city has 10,000 active short-term rental listings on platforms like Airbnb and Vrbo, its total market inventory depth for the fourth quarter (92 days) is 920,000 available nights (10,000 listings × 92 days).

Frequently asked questions

How is Depth of Inventory different from Occupancy Rate?+
Depth of Inventory measures total potential supply—all available nights for booking. Occupancy Rate, in contrast, measures realized demand—the percentage of those available nights that were actually booked. Inventory depth is the denominator in the occupancy rate calculation (Booked Nights ÷ Available Nights). One is the total opportunity; the other is how much of that opportunity was captured.
Do blocked nights for maintenance or owner stays affect the depth of inventory?+
It depends on the context. For market-level data from analytics platforms, nights blocked for owner use or maintenance are typically removed from the total, as they are not truly available for rent. For a property manager's internal reporting, they might be included or excluded. Excluding them provides a more accurate picture of performance on rentable nights, while including them shows the impact of non-revenue-generating blocks on overall potential.
Why would a property manager track depth of inventory for their whole portfolio?+
Tracking portfolio-wide inventory depth is essential for strategic business management. It provides the total capacity figure needed to calculate aggregate performance metrics like overall occupancy and RevPAR. This allows managers to assess the health of the entire business, not just individual properties. It is also fundamental for financial forecasting, staffing models, and understanding potential revenue growth as the portfolio expands or contracts.
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Related terms

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Occupancy Rate

Occupancy Rate is the percentage of booked nights out of the total available nights for a property over a specific period.

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RevPAR (Revenue Per Available Room)

RevPAR is a key performance metric that measures a property's ability to generate revenue from its entire inventory of available rooms.

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Available Nights

Available nights are the total number of nights a property is open and available for booking by guests within a specified period, excluding any dates blocked…

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Acceptance Rate

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