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Lease expiration concentration calculator
Divide leases expiring in a month or period by total active leases to identify timing concentration.
The short answer
Last updated: July 2026
Lease expiration concentration equals expiring leases divided by total active leases. It is a descriptive metric, not a renewal or vacancy forecast.
After the estimate:
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Measure leases expiring in one period.
Divide leases expiring in a chosen month or period by the total active leases you enter.
Total active leases
leases
Leases expiring in one period
leases
Input-driven result
Your inputs
Formula
Result below
Expiry concentration
33.3%
4 expiring leases ÷ 12 active leases.
Estimate based on your inputs. Not a promise of results.
Descriptive planning metric only. It does not predict renewals, vacancies, or required notice timing.
How it works
How this tool works.
Lease expiration concentration calculator is a simple landlord planning worksheet based on values you enter.
The output is arithmetic, not a prediction, contract, or professional recommendation.
Make the result useful
How to measure lease-expiration concentration in a rental portfolio
Lease-expiration concentration shows what share of active leases will roll in one selected month or period. A high result does not automatically mean trouble, but it highlights where renewal outreach, pricing review, and turnover capacity may be tested at the same time.
Use active lease counts on a consistent date and separate fixed-term expirations from month-to-month agreements. The goal is to make the workload visible early enough to offer renewals, stagger terms when appropriate, and plan vendor capacity.
Calculation lens
expiration concentration = leases expiring in the selected period / active leases
The output is the share of leases rolling together. It identifies timing exposure, not expected vacancy or renewal results.
The calculator does not predict renewals, lawful notice requirements, market demand, resident decisions, or actual vacancy.
What concentration is too high?
There is no universal threshold. Compare the cluster with your leasing, maintenance, and cash-reserve capacity.
Should month-to-month tenancies be included?
Track them separately or state a consistent assumption, because they do not have the same fixed expiration date.
Does a high concentration mean I should change every lease term?
Not automatically. Consider resident preference, local requirements, and the operational reason for changing a term before proposing it.
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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