Calculate vacancy rate

Convert annual empty days into vacancy percentage, lost rent, turnover expense, and effective collected rent.

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ToolVacancy Rate Calculator
Input
Output
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How it works

Void days receive a daily share of 12 months of potential rent and divide by 365 for vacancy rate. Cleaning, advertising, or reletting cost is multiplied by separate vacancy events; both turnover inputs default to 0 so an event is not invented.

Formula
lost rent = monthly rent × 12 ÷ 365 × void days
  • Effective rent removes lost rent but not turnover expense, which remains a separate cash cost.
  • Event count matters only when a per-turnover cost is entered.

Worked example

A 1,000 a month let empty for 30 days a year
With a 250 turnover cost each time it changes tenants
Input
											Monthly rent: 1000
Void days per year: 30
Void turnover cost: 250
Voids per year: 1
Output
												Vacancy rate percent: 8.22
Lost rent: 986.3
Turnover costs: 250
Total cost of vacancy: 1236.3
Effective annual rent: 11013.7
Effective monthly rent: 917.81

When to use this

Landlord budgets, property-management turnover planning, and buy-to-let underwriting translate annual void assumptions into effective rent and reletting cost.

Edge cases

  • At 365 void days, effective annual and monthly rent become 0 while turnover costs can remain positive.
  • Several short void events can lose the same rent as one long event but incur more turnover cost.
  • Void days above 365 are rejected rather than implying more than a full year of lost rent.