How to Calculate Vacancy Rate for Your Rental Property
Vacancy rate measures how much of a rental property’s available capacity is unoccupied during a specific period. It is one of the simplest but most useful numbers landlords can track because every vacant unit or vacant day can mean lost rental income.
For a multifamily property or a group of units, the basic formula is:
Vacancy Rate = (Vacant Units ÷ Total Units) × 100
For a single rental property tracked over time, a day-based calculation is usually more useful:
Vacancy Rate = (Vacant Days ÷ Total Available Days) × 100
For example, if a single-family rental sits vacant for 30 days during a 365-day year:
30 ÷ 365 × 100 = 8.2% vacancy rate
The calculation itself is simple. Interpreting the result requires more context. Property type, local rental demand, seasonality, pricing, turnover, and even the way “vacancy” is defined can change what the percentage means.