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Vacancy Rate Calculator

Calculate your property or portfolio vacancy rate percentage, occupancy rate percentage, and estimated lost rental revenue based on either vacant days per year or vacant units.

Vacancy Units / Days & Rental Rate

Vacancy & Occupancy
Vacancy Rate
6.03%
Occupancy Rate
93.97%
Estimated Lost Rental Income$1,760.00
Potential Gross Rental Income$29,200.00
Effective Collected Income$27,440.00

Vacancy Rate & Lost Rental Revenue Formula

Vacancy Rate (%) = (Vacant Units or Days รท Total Available Units or Days) ร— 100 | Lost Rent = Vacant Count ร— Rate per Unit/Day
  • Occupancy Percentage (%) = 100% โˆ’ Vacancy Rate (%).
  • Estimated Lost Rental Income = Vacant Units or Days ร— Optional Rental Rate per Unit or Day.
  • Effective Collected Income = Potential Gross Rental Income โˆ’ Estimated Lost Rental Income.

Step-by-Step Worked Example

Scenario: Calculating annual vacancy rate and lost revenue for a rental property that sat vacant for 22 days out of 365 days at an $80/day equivalent rent

Calculation Steps:

  1. Vacancy Rate = (22 รท 365) ร— 100 = 6.03% (Occupancy Rate = 93.97%)
  2. Estimated Lost Rental Income = 22 ร— $80 = $1,760.00
  3. Effective Collected Income = (365 โˆ’ 22) ร— $80 = $27,440.00
Result: Your annual vacancy rate is 6.03% (93.97% occupancy), resulting in $1,760.00 of lost rental revenue.

How to Use This Calculator

  1. 1Select whether you want to measure vacancy by Rental Days (for a single property over a year) or Rental Units (for a multi-unit building or portfolio).
  2. 2Enter the total available days or units and the number of vacant days or units.
  3. 3Optionally enter the rental rate per day or per unit to quantify lost rental income in dollars.

Assumptions & Limitations

  • Physical vacancy measures unoccupied units or days; economic vacancy can also include non-paying occupied units.

Frequently Asked Questions

How many vacant days per year equals a 5% vacancy rate?

Out of 365 calendar days, a 5% vacancy rate equals approximately 18.25 vacant days per year (or roughly one 36-day tenant turnover every two years).

What is the difference between physical vacancy and economic vacancy?

Physical vacancy is the percentage of units or days that are physically empty. Economic vacancy is the percentage of potential gross rent not collected due to empty units, move-in concessions, free rent promotions, or tenant delinquency.

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