Landlord Vacancy Rate Calculator: Empty Months as a Share of Total
Work out a rental property's vacancy rate — the headline measure of how much rental income is lost to empty units, and the figure underwriting models include before they show a net yield.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Vacancy rate | Occupancy rate |
|---|---|---|
| 3 of 60 unit-months | 5.00% | 95.00% |
| 1 of 12 unit-months | 8.33% | 91.67% |
| 8 of 120 unit-months | 6.67% | 93.33% |
| 4 of 24 unit-months | 16.67% | 83.33% |
How This Calculator Works
Enter vacant unit-months and total unit-months. For a single rental, count months across one unit. For a portfolio, sum vacant months across all units and compare against units times months. The calculator divides one by the other to give vacancy rate, with occupancy shown alongside.
The Formula
Part as a Percentage of a Whole
Part is the portion, Whole is the total it belongs to
Worked Example
Three vacant unit-months out of a five-unit, twelve-month period (60 unit-months) is a 5% vacancy rate, with 95% occupancy. Stabilized residential markets often run 4% to 7% vacancy; commercial swings wider with the cycle.
Key Insight
Vacancy rate is the difference between gross potential rent and effective rent. A 5% vacancy on a $30,000-a-year unit is $1,500 of foregone income — enough to wipe out a year of careful cost control. Underwrite the vacancy you expect, not the zero-vacancy fantasy a pro-forma starts with.
Why 5% is the 'natural vacancy rate' for healthy markets
Real estate economists describe ~5% vacancy as 'natural' or 'frictional' vacancy — the minimum vacancy rate consistent with normal tenant turnover and re-leasing time. Below 5%, the market is 'tight' (rents rising rapidly, hard for tenants to find units). Above 8-10%, the market is 'loose' (rent pressure flat or down, landlords competing).
Tenant turnover drives most natural vacancy. The average U.S. residential lease is 12-24 months. After lease end: ~50-70% of tenants renew; ~30-50% move out. The vacancy between move-out and move-in averages 14-30 days even in good markets. With 40% annual turnover and 21-day average vacancy, structural vacancy is ~2.3% from turnover alone — plus time for re-leasing, marketing, repairs adds another 2-3%.
Class A properties achieve lower vacancy (3-6%) through (a) lower turnover (longer average tenancy due to better amenities); (b) faster re-leasing (high tenant demand, marketing efficiency); (c) shorter prep time (lower maintenance per turn). Class C properties show higher vacancy (10-20%) due to higher turnover, longer re-leasing time, and more deferred maintenance work.
Vacancy as risk indicator — when 5% becomes 15%
Vacancy rates can shift rapidly in response to local economic shocks. Hospital, military base, or major employer closure can shift vacancy from 5% to 15% in 12 months as relocations cascade. Examples: Detroit's auto industry decline (1985-2010) drove vacancy rates from ~10% to 25%+ across the city; Gary, Indiana similar pattern; some Texas oil patch towns during downturns.
Risk management: avoid heavy property concentration in mono-economy markets. Multifamily investors with portfolios concentrated in single industry markets (energy / oil; auto manufacturing; single major employer) face structural vacancy risk if that industry contracts. Diversification across 3+ markets with different industry mixes reduces this risk substantially.
Conversely, dramatic vacancy DECLINES can create acquisition opportunities. Markets that overcorrected (Phoenix 2009-2011 with 20%+ vacancy) provided extraordinary returns to investors who could underwrite the recovery. Buying at 20% vacancy and watching it normalize to 8% over 5 years provided ~50-100% IRR for skilled operators. The challenge is identifying which 20% vacancy markets will recover vs structural decline (Detroit 1990-2010 didn't recover; Phoenix 2009-2013 did).
U.S. residential vacancy benchmarks (Census HVS 2024)
Reference U.S. vacancy rates by region and property type.
| Category | 2024 vacancy rate | Notes |
|---|---|---|
| U.S. National rental vacancy | ~6.5% | Census quarterly data |
| U.S. National homeowner vacancy | ~0.9% | Owner-occupied |
| Northeast region | ~5.5% | Tight market |
| Midwest region | ~7.5% | |
| South region | ~7.0% | |
| West region | ~5.5% | Tight market |
| Class A multifamily (avg) | ~4-6% | Tight market, low turnover |
| Class B multifamily (avg) | ~6-10% | |
| Class C multifamily (avg) | ~10-15% | Higher turnover |
| Single-family rental | ~4-7% | Lower turnover than apt |
| Vacation / short-term (occupied days) | 30-60% vacancy | Different metric |
Census Housing Vacancy Survey is the most authoritative U.S. source for residential vacancy data. Regional and class-specific variation is substantial. For specific market underwriting, supplement Census data with CoStar / RealPage market reports for current local conditions.
Frequently Asked Questions
How is vacancy rate calculated?
Divide vacant unit-months by total unit-months over the same period, then multiply by 100. Three vacant months out of 60 unit-months is a 5% vacancy rate.
What is a normal vacancy rate?
Stabilized US residential markets typically run 4% to 7%. Hot metros run lower; college towns spike between school years. Commercial real estate runs wider, often 5% to 15% depending on segment.
Should I include intentional vacancy?
Yes — vacancy for renovation or marketing time still represents lost rent. Many landlords track 'economic vacancy' separately from 'physical vacancy' to see what was unavoidable versus what was strategic.
How does this differ from occupancy rate?
They are complements. Vacancy = 100% minus occupancy. The calculator shows both — occupancy is the more common rental-listing metric, vacancy the more common underwriting one.
How can I lower vacancy?
Slightly lower asking rent, longer marketing windows before lease-end, easier move-in terms, and pre-leasing programs. The cost of higher vacancy almost always exceeds the cost of a slightly lower rent.
When is this calculator unreliable?
As a forward projection (vacancy depends on tenant mix, market conditions, and property management quality — all can shift), when comparing across very different property types (multifamily, single-family, vacation rentals have very different natural vacancy rates), or when local economic shocks materially change market vacancy beyond historical patterns.
References & Authoritative Sources
- U.S. Census Bureau — Housing Vacancies and Homeownership — Quarterly Housing Vacancy Survey · consulted June 1, 2026 · Official U.S. residential vacancy rate data
- National Multifamily Housing Council (NMHC) — Annual Apartment Market Index · consulted June 1, 2026 · Industry benchmarks for U.S. multifamily occupancy
- RealPage / CoStar — Apartment Market Reports — Quarterly U.S. Apartment Market Reports · consulted June 1, 2026 · Industry data on U.S. apartment vacancy and rent trends
Related Calculators
Methodology & Review
Vacancy rate equals vacant unit-days / total unit-days × 100. For a single property: (months vacant per year / 12) × 100. The calculator returns vacancy rate as a percentage. For real estate underwriting purposes, vacancy is typically modeled as a percentage of gross potential rent ('vacancy allowance'): typical 5-8% for well-managed Class A residential; 8-15% for Class B/C; 15-25% for high-turnover or distressed properties. Vacancy allowance is one of the key 'expense' line items in NOI calculation even though it represents foregone income rather than expense. RELIABILITY: Reliable for backward-looking analysis with documented vacancy. Less reliable as a forward projection — vacancy depends on tenant mix, market conditions, and property management quality, all of which can shift. National multifamily vacancy data (Census, RealPage) provides regional benchmarks but individual properties can vary substantially.
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