Free calculator
Vacancy rate calculator
Measure the physical vacancy rate of a unit or a small portfolio over any period — days vacant divided by days available, or vacant unit-months divided by total unit-months. Your own occupancy math, not a market benchmark.
The short answer
Last updated: July 2026
Physical vacancy rate is the share of available rental time a space sat empty: days vacant ÷ days available × 100 (or vacant unit-months ÷ total unit-months for a portfolio). A unit empty 36 days out of 365 has a vacancy rate of roughly 10%. This calculator computes it from your own records — an estimate, not a market benchmark.
After the estimate:
Self-management softwareVacancy rate calculator
What share of the time it actually sat empty.
Measure your physical vacancy rate over any period — a single unit in days, or a small portfolio in unit-months. The result is your own occupancy math, not a market benchmark.
How do you want to measure?
One unit (days)
Portfolio (unit-months)
Days vacant
30 days
0
365
Period measured
365 days
30 days
365 days
The window you're measuring over — a full year (365), a quarter (~90), or any stretch you choose.
Input-driven result
Your inputs
Formula
Result below
Vacancy rate
8.2%
30 days vacant ÷ 365 days available.
Occupancy rate
91.8%
The flip side — the share of available time the space was rented.
Occupied versus vacant share
Occupied share
91.8%
Vacant share
8.2%
Days vacant
30
Estimate based on your inputs. Not a promise of results.
Estimate only. This is physical vacancy — time the space sat empty. It doesn't measure economic vacancy (rent billed but not collected) and it doesn't compare your number to any market average.
How it works
How this tool works.
Most landlords remember a vacancy as an event — “the unit sat empty in March.” A vacancy rate turns those events into a number you can track year over year: of all the time the space was available to rent, what share of it was actually empty? It’s the difference between a vague sense that turnover was rough and knowing your building ran at 6% vacancy last year versus 3% the year before.
This calculator works two ways. For a single unit, enter the days vacant and the period you’re measuring (a year, a quarter, any stretch). For a small portfolio, count in unit-months: four units over twelve months is 48 unit-months of availability, and each month a unit sat empty adds one to the vacant count. Either way the output is your physical vacancy rate and its flip side, your occupancy rate — computed from your records, not compared to anyone else’s.
Make the result useful
Vacancy-rate measurement
Available units or days define the denominator and must match the reporting period.
Vacant units or days are the numerator; distinguish a point-in-time count from a period total.
Physical vacancy does not automatically capture unpaid or discounted rent.
Use the rate with lost-rent dollars and turnover timing for operational decisions.
Calculation lens
vacancy rate = vacant inventory ÷ available inventory
Use the output as a documented scenario result, not a guarantee.
Does not predict lease-up or quantify all economic loss.
Questions landlords ask
Questions about this tool and its limits.
Built by a landlord who's done every one of these jobs by hand.
Aptoria was built by an owner-operator managing a Brooklyn portfolio — the 11pm calls, the awkward rent texts, the April receipt-pile — not by a software team guessing at the problem.
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