# Vacancy Rate & Loss Calculator Price vacancy in unit-days, add concessions and delinquency, and see economic vacancy against physical. --- - **Canonical URL:** https://dothecalculation.com/calculators/vacancy-rate-loss-calculator - **Category:** Real Estate & Property - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology --- ## Vacancy Rate, Economic Vacancy, and What Empty Days Cost Price vacancy in unit-days rather than a guessed percentage, then add the concessions, delinquency, and turnover costs that separate physical vacancy from economic vacancy. - Physical vacancy from actual vacant days, not a rule of thumb - Economic vacancy including concessions and delinquency - Turnover cost shown separately, because it is not an income loss ## Quick Answer — How Do You Calculate a Vacancy Rate? Physical vacancy divides vacant unit-days by available unit-days: \(\text{Physical Vacancy} = \frac{\text{Vacant Unit-Days}}{\text{Units} \times 365} \times 100\). Economic vacancy divides every dollar of lost income by gross potential rent, which is a larger and more useful number. The chain, in order: • **Gross Potential Rent** = Units × Monthly Rent × 12 • **Vacancy Loss** = Vacant Unit-Days × (Annual Rent per Unit ÷ 365) • **Economic Loss** = Vacancy Loss + Concessions + Delinquency • **Effective Gross Income** = Gross Potential Rent − Economic Loss **Worked example:** a four-unit building at **$1,450** a unit has **$69,600** of gross potential rent and a daily rent of **$47.67** per unit. **96** vacant unit-days is **6.58%** physical vacancy and **$4,576.44** of lost rent. Add **$1,450** of concessions and **1.5%** delinquency (**$1,044**) and total income loss is **$7,070.44** — an **economic vacancy of 10.16%**, well above the physical figure. Effective gross income is **$62,529.56**. Turnover costs sit outside that calculation because they are expenses, not lost income. Two turnovers at **$1,800** each adds **$3,600**, taking the total hit to **$10,670.44** — over 15% of gross potential rent. ## How to Use This Calculator: A Four-Unit Building Start with the unit count and the average monthly rent, which set gross potential rent — the income the property would produce fully occupied at asking rent, with everyone paying. That is the denominator for everything that follows. Enter vacant days as **unit-days across the whole property**, not days per unit. Four units with 96 vacant unit-days averages **24 days empty per unit** over the year, which is a normal-looking result for a building with two turnovers. Pricing it in days rather than as a percentage is the point: at **$47.67** a day, every extra week a unit sits empty costs **$333.70**, which makes the value of a faster turn concrete. Concessions are the free-rent and discount promotions used to fill units. A single month free on one lease is **$1,450** of income that never arrives even though the unit shows as occupied. This is the classic gap between the occupancy report and the bank statement. Delinquency is unpaid rent on occupied units. At **1.5%** of gross potential rent that is **$1,044** here. Together, concessions and delinquency raise the loss from the **6.58%** physical figure to a **10.16%** economic one — a difference of **$2,494** that a physical vacancy rate alone would never show. Feed the resulting effective gross income into the [net operating income calculator](/calculators/net-operating-income-calculator) rather than starting from gross rent, which is the most common way rental underwriting inflates itself. ## A Second Example: One Unit, One Slow Turn Small portfolios feel vacancy far more sharply because there is nothing to average against. Take a **single** unit renting at **$2,200** that sat empty for **45 days** between tenants, with no concessions and no delinquency. Gross potential rent is **$26,400** and the daily rent is **$72.33**. Forty-five vacant days is **12.33%** physical vacancy — nearly double the four-unit example — and **$3,254.79** of lost rent. Effective gross income falls to **$23,145.21**. Add a single turnover at **$2,600** for paint, cleaning, a locksmith, and a leasing fee, and the total impact is **$5,854.79**, or **22.2%** of gross potential rent. On a property that might have been underwritten at a 5% vacancy allowance, the real first-year figure is more than four times that. This is why the standard 5% planning assumption is dangerous for single units. Five percent of a year is 18 days — barely enough to turn a unit at all if anything needs doing. A more honest approach for a single-family rental is to budget the actual expected downtime between tenants and the actual expected tenancy length: a unit that turns every two years with a 45-day gap runs closer to 6% vacancy on average, and one that turns annually runs at 12%. The [break-even rent calculator](/calculators/break-even-rent-calculator) converts that directly into how many empty days the property can absorb before it stops covering itself. ## Physical Vacancy, Economic Vacancy, and Turnover Cost **Physical vacancy** counts empty units. It is what occupancy reports show and what most underwriting uses, and it systematically understates the problem because a unit can be occupied and still not producing full rent. **Economic vacancy** counts lost dollars. It captures the same empty units plus free-rent concessions, below-market renewals, and rent that was billed but never collected. In the four-unit example it is 10.16% against a 6.58% physical rate — the gap is more than half again as large as the headline number. When a property's occupancy is reported at 95% but its income is 10% below gross potential, the difference is concessions and delinquency, and it is worth finding out which. **Turnover cost** is a third category and belongs in the expense line, not the vacancy line. Make-ready painting, cleaning, carpet, locks, and the leasing fee for finding a new tenant are real cash out the door, but they reduce net operating income as expenses rather than reducing effective gross income. Mixing them into a vacancy rate double-counts them against cap rate and makes the expense ratio look artificially low. The practical lever in all three is tenant retention. A renewal at a slightly below-market rent avoids the vacant days, the concession needed to fill the unit, and the turnover cost all at once — which is why the [rent increase calculator](/calculators/rent-increase-calculator) and this page are best used together. An increase that gains $100 a month but triggers a 45-day vacancy plus a $2,600 turn is a loss of roughly $4,600 in exchange for $1,200 a year. ## Limitations This calculator performs exact arithmetic on the figures you enter, and the output is only as good as your record of vacant days. Most landlords underestimate them, because the count that matters runs from the day the previous tenant's rent stops to the day the new tenant's rent starts — not from the day the unit was listed. Days spent on make-ready work before listing are vacant days. It uses a single average rent across all units, so a building with a wide spread between unit types will produce an approximate gross potential rent. It also uses a simple 365-day year and does not model seasonality, even though leasing markets are strongly seasonal in most places and a lease that expires in December is materially more expensive to turn than one expiring in June. Nor does it model lease-expiration clustering, where several units come up at once and a soft month hits the whole property. Delinquency here is entered as a percentage of gross potential rent and treated as permanently lost. In practice some arrears are recovered, some are recovered only after an eviction that costs more than the arrears, and the accounting treatment differs between cash and accrual reporting. Treat the figure as a planning allowance. This is a general educational tool, not investment advice — verify assumptions against your own operating history and consult a qualified professional before making decisions on a specific property. ## Related Calculators Feed the effective gross income from this page into the [Net Operating Income Calculator](/calculators/net-operating-income-calculator) rather than starting from gross rent — that single substitution fixes most of the optimism in a rental pro forma. The [Break-Even Rent Calculator](/calculators/break-even-rent-calculator) converts the same numbers into how many vacant days the property can survive, the [Property Cash Flow Calculator](/calculators/property-cash-flow-calculator) carries them through to monthly cash, and the [Rental Property ROI Calculator](/calculators/rental-property-roi-calculator) puts them into a full return. Before raising a rent that might trigger a turn, price the risk with the [Rent Increase Calculator](/calculators/rent-increase-calculator). ## Frequently asked questions ### How do you calculate a vacancy rate for a rental property? Divide vacant unit-days by available unit-days and multiply by 100. A four-unit building with 96 vacant unit-days over a year has 96 ÷ (4 × 365) = 6.58% physical vacancy. Pricing it in days rather than a guessed percentage is what makes the number defensible. ### What is the difference between physical and economic vacancy? Physical vacancy counts empty units; economic vacancy counts lost dollars. A property can be fully occupied and still lose income to free-rent concessions, below-market leases, and unpaid rent. In the worked example, 6.58% physical vacancy corresponds to 10.16% economic vacancy — a $2,494 difference on a $69,600 rent roll. ### What is a good vacancy rate? It depends heavily on market and property type, and a single-family rental behaves very differently from a multi-unit building. The 5% planning figure used in most pro formas is 18 days a year, which is barely enough to turn a unit at all — realistic for a stabilised building with long tenancies, optimistic for a single unit that turns often. ### How much does one vacant month cost? One month at the daily rate, plus whatever it takes to fill the unit. At $1,450 a month the daily rent is $47.67, so 30 empty days is $1,430 — before any concession offered to fill it and before make-ready costs. On a $2,200 unit, a 45-day gap is $3,254.79. ### Should turnover costs be included in the vacancy rate? No. Turnover costs are operating expenses, not lost income, and they reduce net operating income rather than effective gross income. Folding them into a vacancy rate double-counts them and makes the operating expense ratio look artificially low. Track them separately, as this calculator does. ### What counts as a vacant day? Every day between the last tenant's rent stopping and the next tenant's rent starting, including time spent on make-ready work before the unit was even listed. Counting only from the listing date is the most common way vacancy gets understated. ### How do concessions affect the vacancy rate? They do not touch the physical rate at all, which is exactly the problem. One month free on a $1,450 unit is $1,450 of income that never arrives while the unit reports as occupied. Concessions belong in economic vacancy, which is why a property can show 95% occupancy and 10% economic vacancy at the same time. ### How do you reduce vacancy loss? Retention is the biggest lever, because a renewal avoids the vacant days, the concession, and the turnover cost simultaneously. A $100 monthly increase that triggers a 45-day vacancy plus a $2,600 turnover costs roughly $4,600 to gain $1,200 a year. Beyond that: start marketing before the current tenant leaves, and shorten make-ready time. ## Related concepts - **Gross Potential Rent** — What the property would collect fully occupied at asking rent with no losses. The denominator every vacancy figure is measured against. - **Effective Gross Income** — Gross potential rent less vacancy, concessions, and delinquency. The correct starting point for a net operating income calculation. - **Economic Vacancy** — Every dollar of rent not collected, expressed as a percentage of gross potential rent. Always at least as large as physical vacancy, often much larger. ## Related guides - [Airbnb ROI Guide: How to Calculate Cap Rate, Cash Flow, and Cash-on-Cash Return](https://dothecalculation.com/blog/property/airbnb-roi-guide) — Underwrite short-term rentals like a professional. Learn how to calculate cap rate, monthly net cash flow, and occupancy-driven returns using actual vacation rental math. - [How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide](https://dothecalculation.com/blog/site-guides/how-to-use-calculators) — Learn the fastest reliable workflow for using Do The Calculation calculators, reading results, checking formulas, and using save, print, share, and export actions correctly. ## Related calculators - [Rental Yield Calculator (Gross & Net)](https://dothecalculation.com/calculators/rental-yield-calculator) — Calculate gross and net rental yield from purchase price, rent, vacancy, and operating expenses to see real return, not just the headline number. - [Home Staging Cost & ROI Calculator](https://dothecalculation.com/calculators/home-staging-roi-calculator) — Price a staging budget against the price lift and the carrying costs saved by a faster sale. - [Jumbo Loan Calculator](https://dothecalculation.com/calculators/jumbo-loan-calculator) — Check a loan against the 2026 conforming limits, price the payment and reserves, and compare ways to stay conforming. - [Net Operating Income (NOI) Calculator](https://dothecalculation.com/calculators/net-operating-income-calculator) — Calculate a rental property Net Operating Income from gross rent, other income, vacancy loss, and a full operating expense breakdown. - [Property Management Fee Calculator](https://dothecalculation.com/calculators/property-management-fee-calculator) — Add leasing, renewal, markup and flat fees to the headline rate for the effective cost of management. - [Second Mortgage Calculator](https://dothecalculation.com/calculators/second-mortgage-calculator) — Borrowing capacity against a combined loan-to-value ceiling, the payment, and the blended rate across both liens. --- _This calculator performs exact arithmetic on the figures you enter, and its accuracy depends entirely on an honest count of vacant days — measured from when the last tenant's rent stopped, not from when the unit was listed. It uses a single average rent across units, a flat 365-day year, and no seasonality, so a building with varied unit types or clustered lease expirations will need a more detailed model. Delinquency is treated as permanently lost, which is a planning assumption rather than an accounting fact. This is a general educational tool, not investment advice — verify against your own operating history and consult a qualified professional before deciding on a specific property._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/vacancy-rate-loss-calculator). Quote freely with attribution and a link to this page._