Rental Property ROI Calculator

Eliminates gut-feel investing. Many first-time landlords buy a rental property because it "feels right", the location is nice, the numbers seem round. The calculator forces you to quantify every input: exact mortgage payments, vacancy losses, management fees, maintenance, and surfaces properties where optimistic assumptions mask a cash-flow-negative deal before you close.

Sensitivity analysis in seconds. Rent assumptions are uncertain; vacancy is unpredictable. Sliding the Monthly Rent input down by $200 or the Vacancy Rate up from 5% to 10% shows you exactly how sensitive your cash flow is to those assumptions. Properties with thin margins (barely positive cash flow) carry much more risk than properties with comfortable buffers.

Separates two distinct metrics. Many online sources conflate cap rate and cash-on-cash return. Seeing both in the same output makes their relationship clear: cap rate is about the property, cash-on-cash is about your financing. High-leverage investors benefit from cheap debt; high-rate environments flip this advantage.

Models the actual cost stack. A common mistake is modeling only mortgage, rent, and taxes. The calculator includes insurance, maintenance, and management fees, the three line items most frequently omitted by optimistic buyers. Management fees alone (8–10% of rent) can swing a marginally positive deal negative.

First-time rental property investors. Before purchasing your first investment property, running the numbers through this calculator prevents the most common mistake: buying a cash-flow-negative property on the assumption that appreciation will save the investment.

House hackers considering renting out a unit. If you plan to live in one unit of a duplex or triplex and rent the others, this calculator helps you model whether the rental income covers the mortgage, a key metric for house hacking viability.

Experienced investors evaluating new acquisitions. Veteran landlords use this tool to quickly screen potential deals and compare properties across different markets. Adjusting the Mortgage Rate slider to current rates shows whether a property underwritten at 3% still makes sense at 7%.

Real estate agents and lenders. Showing a client the ROI analysis of a prospective investment property adds analytical depth to the buying conversation. The shareable URL (auto-populated in the browser) lets you send a pre-filled analysis for any property.

Portfolio landlords managing multiple properties. Running each property through the calculator annually, updating rent to market levels, adjusting expenses for inflation, gives you a comparative performance snapshot across your portfolio.

Monthly Cash Flow is the bottom-line number: how much money you pocket (or lose) each month after all expenses are paid. It equals effective rental income minus all monthly costs, mortgage principal and interest, property tax, insurance, maintenance, and management fees. Positive cash flow means the property pays for itself and generates income; negative cash flow means you are subsidizing the property from other income each month.

Annual Cash Flow simply annualizes the monthly figure. This is the number to compare against your down payment for cash-on-cash return. It also helps you model whether your rental income covers a meaningful portion of your annual living expenses.

Cash-on-Cash ROI is the annual cash flow divided by your total cash invested (down payment). This is the most relevant ROI metric for leveraged real estate, it measures the return on the dollars you actually put in. A 6–8% CoC return is generally considered a good result in most markets.

Cap Rate is the net operating income (NOI, which excludes your mortgage payment) divided by the purchase price. This rate is independent of your financing and lets you compare this property against others in the market, or against the cap rates listed for comparable sales. A cap rate below current mortgage rates generally means you cannot achieve positive cash flow without a large down payment.

Gross Yield is the simplest metric: annual gross rent divided by purchase price. It ignores all expenses and vacancy, so it is not useful for final analysis, but it is the fastest screening metric for comparing dozens of listings quickly before drilling into full analysis.

Monthly Mortgage shows the pure principal-and-interest payment, useful for understanding what share of your rental income goes to debt service versus expenses versus profit.

1. Enter the Purchase Price, the price you are paying or analyzing. Do not subtract the down payment here; the calculator computes the loan amount from the purchase price and down payment percentage.

2. Set the Down Payment percentage, for conventional investment property loans, lenders typically require 20–25%. Enter 20 for the minimum conventional down payment. Higher down payments reduce your mortgage and improve cash flow but reduce cash-on-cash return (more cash invested for the same cash flow).

3. Enter the Mortgage Rate and Loan Term, use your actual quoted rate or the current 30-year investment property mortgage rate. Investment property loans typically carry a rate 0.5–0.75% higher than primary residence loans. The term is almost always 30 years for investment property.

4. Enter Monthly Rent, use a realistic market rent estimate. Check local listings (Zillow Rental Manager, Realtor.com, or Rentometer) for comparable properties. Avoid using the top of the range, market rents can soften.

5. Set the Vacancy Rate, default to 8% (approximately one month vacant per year) unless you have data suggesting otherwise. Higher-turnover areas or properties need higher vacancy assumptions.

6. Enter Annual Property Tax Rate, find this on the county assessor's website. The effective property tax rate in the US ranges from 0.3% in Hawaii to 2.5% in New Jersey; the national average is around 1.1%.

7. Enter Monthly Insurance, landlord insurance (dwelling fire and liability) typically runs $100–200/month for a single-family home. Request a quote from your insurer for accuracy.

8. Enter Monthly Maintenance, a conservative rule is 1% of property value per year (so a $300,000 property = $3,000/year = $250/month). This covers routine repairs, appliances, and minor capital items.

9. Set Property Management Fee, if you are self-managing, enter 0. If using a manager, 8–10% of gross rent is typical. Even if you plan to self-manage, consider running the numbers with 8–10% to understand what a manager would cost and whether the deal still works.

10. Read the results panel, the Monthly Cash Flow result tells you immediately whether the deal is positive or negative. Adjust inputs to stress-test: lower rent by 10%, raise vacancy to 12%, and check whether the deal survives those assumptions.