Vacancy Rate Calculator

Use this calculator to estimate vacancy rate from vacant days and total days. It helps property investors measure how much rental time was lost to vacancy.

What this calculator does

The vacancy rate calculator measures vacant days as a percentage of total available days.

It uses:

• vacant days
• total days
• vacancy percentage
• rental availability period

This gives a simple vacancy rate for reviewing income loss and occupancy performance.

How to use the vacancy rate calculator

Enter the number of vacant days and the total number of days in the period. For a full year, total days will usually be 365.

Vacant days must not be greater than total days because the property cannot be vacant for more days than the period measured.

Vacancy Rate Formula

Vacancy rate = vacant days / total days x 100

Where vacant days are days without a tenant or rent collection and total days are the full period measured.

Example calculation

If:

• Vacant days = 18
• Total days = 360
• Formula = 18 / 360 x 100
• Vacancy rate = 5.00%

A property vacant for 18 days out of 360 has a vacancy rate of 5.00%.

What is vacancy rate?

Vacancy rate measures the portion of time a property is not occupied or not generating rent. It is a key rental performance metric because even short gaps can reduce annual income.

Vacancy can be caused by tenant turnover, weak demand, repairs, pricing, or seasonal leasing patterns.

Interpreting your result

A lower vacancy rate usually means stronger occupancy and more stable rent collection. A higher vacancy rate may indicate pricing, location, tenant quality, or management issues.

Use vacancy rate in property cash flow assumptions so income estimates are not overly optimistic.

When to use this calculator

Use this calculator when you want to:

• measure lost rental time
• compare occupancy performance
• test cash flow assumptions
• review leasing efficiency

Common mistakes

Common mistakes include:

• using months instead of days
• excluding rent-free gaps
• entering vacant days above total days
• ignoring partial vacancy periods

FAQs

Can vacant days be zero?

Yes. If vacant days are 0, vacancy rate is 0.00%.

Why does vacancy matter?

Vacancy reduces collected rent and can materially affect cash flow and yield.