PITI, PMI, Equity & Appreciation
Last reviewed: April 2026
A real estate calculator evaluates the financial aspects of buying, selling, or investing in property. It can estimate mortgage payments, closing costs, rental yields, and return on investment to help you make informed decisions in the housing market.
Real estate returns depend on several metrics: cap rate (net operating income ÷ property value), cash-on-cash return (annual cash flow ÷ total cash invested), and gross rent multiplier (property price ÷ annual gross rent). This calculator helps evaluate whether a rental property is a good investment by running these key metrics.
Cap rate ignores financing — it measures the property's return as if you paid all cash. Cash-on-cash accounts for your actual mortgage, so it reflects your return on the money you put in. A property with a 6% cap rate might produce a 12% cash-on-cash return with leverage (a mortgage) because you're investing less of your own money. For detailed rental analysis, see our Rental Property Calculator.
| Metric | Formula | Good Target |
|---|---|---|
| Cap rate | NOI / Purchase price | 5–10% |
| Cash-on-cash return | Annual cash flow / Cash invested | 8–12% |
| 1% rule | Monthly rent ≥ 1% of price | Rent ≥ 1% |
| GRM | Price / Annual gross rent | <15 |
| DSCR | NOI / Annual debt service | >1.25 |
Real estate investment analysis centers on a handful of financial metrics that separate profitable deals from money traps. Cap rate (capitalization rate) is the most fundamental — it measures the property's net operating income divided by its purchase price, expressed as a percentage. A $300,000 property generating $24,000 in annual net operating income has an 8% cap rate. Typical cap rates range from 4–6% in premium urban markets to 8–12% in secondary and tertiary markets. Lower cap rates imply lower risk but also lower returns, while higher cap rates suggest either more risk or an undervalued property in a less competitive market.
| Metric | Formula | Good Benchmark |
|---|---|---|
| Cap Rate | NOI / Purchase Price | 5–10% (varies by market) |
| Cash-on-Cash Return | Annual Cash Flow / Cash Invested | 8–12% |
| GRM | Price / Gross Annual Rent | 8–15 |
| DSCR | NOI / Annual Debt Service | >1.25 |
| 1% Rule | Monthly Rent / Purchase Price | ≥1% |
Cap rate evaluates the property as if purchased entirely with cash. Cash-on-cash return measures the actual return on the money you invested — factoring in leverage, mortgage payments, and closing costs. A property with a 7% cap rate purchased with 25% down and a 6.5% mortgage might produce a 10–12% cash-on-cash return because leverage amplifies the returns on invested capital. Conversely, if the mortgage rate exceeds the cap rate, leverage works against you and the cash-on-cash return drops below the cap rate. Understanding this relationship determines whether financing helps or hurts each specific deal.
Net operating income (NOI) is gross rental income minus all operating expenses — but many new investors underestimate operating costs. A common rule of thumb is the 50% rule: expect approximately 50% of gross rent to go toward operating expenses excluding the mortgage. On a property renting for $2,000 per month ($24,000 annually), expect roughly $12,000 in operating expenses, leaving $12,000 in NOI before debt service.
| Expense Category | % of Gross Rent | Annual Cost ($2,000/mo rent) |
|---|---|---|
| Property taxes | 10–15% | $2,400–$3,600 |
| Insurance | 3–5% | $720–$1,200 |
| Maintenance/repairs | 8–12% | $1,920–$2,880 |
| Vacancy allowance | 5–8% | $1,200–$1,920 |
| Property management | 8–10% | $1,920–$2,400 |
| Utilities/HOA | 2–5% | $480–$1,200 |
| Capital expenditures | 5–10% | $1,200–$2,400 |
The 1% rule states that a rental property's monthly rent should be at least 1% of the purchase price for the numbers to work. A $250,000 property should rent for at least $2,500 per month. This rule functions as a rapid screening tool — properties that pass the 1% test are worth deeper analysis, while those falling far below 0.7–0.8% rarely produce positive cash flow after expenses and debt service. In expensive coastal markets, meeting the 1% rule is nearly impossible, which is why many investors focus on Midwest and Southern markets where purchase prices are lower relative to rental income.
Real estate investors generally pursue one of two strategies — or a blend. Cash flow investors prioritize monthly income, targeting properties with high cap rates that generate profit from day one, typically in affordable markets with steady rental demand. Appreciation investors accept lower or even negative cash flow in exchange for exposure to markets with strong price appreciation driven by job growth, population influx, and limited housing supply. Over long holding periods, appreciation often contributes more to total returns than cash flow, but it requires patience and carrying costs during periods of flat or declining values.
The ideal scenario combines both: a property that cash-flows positively from purchase while also sitting in a growth market. These opportunities are rarer and require more research, but they exist consistently in markets experiencing the early stages of economic expansion — areas with new employer relocations, infrastructure investment, or university expansion that have not yet been fully priced into real estate values.
Rental property owners benefit from several significant tax advantages. Depreciation allows you to deduct the cost of the building (not the land) over 27.5 years for residential property, even as the property actually appreciates in value. On a $300,000 property where the building is worth $240,000, annual depreciation is $8,727 — a phantom expense that reduces taxable income without any cash outlay. Mortgage interest, property taxes, insurance, repairs, property management fees, and travel to the property are all deductible against rental income. If total deductions exceed rental income, the resulting paper loss may offset other income through the passive activity loss rules, subject to income limits.
Investment property financing differs significantly from primary residence loans. Conventional loans require 15–25% down with interest rates typically 0.5–0.75% higher than owner-occupied rates. DSCR loans qualify based on the property's income rather than the borrower's personal income — ideal for investors with complex tax returns. Commercial loans, portfolio loans, hard money loans, and seller financing each serve different investor profiles and property types. Understanding which financing vehicle matches your situation affects both your initial capital requirements and long-term returns. Use this calculator to model different down payment percentages and rate scenarios to find the structure that maximizes your cash-on-cash return.
A 1031 exchange allows investors to sell a rental property and defer all capital gains taxes by reinvesting the proceeds into a like-kind replacement property within strict timelines: 45 days to identify replacement properties and 180 days to close. This mechanism enables investors to continuously trade up into larger or higher-performing properties without triggering a taxable event. An investor who bought a duplex for $200,000, sells it for $400,000 after 10 years, and exchanges into a fourplex defers the $200,000 gain entirely. Over multiple exchanges across a career, investors can compound returns on the full pre-tax amount, building significantly more wealth than if they paid capital gains at each sale.
Input your purchase price, expected rent, operating expenses, financing terms, and holding period to see projected returns across multiple metrics simultaneously. Compare different properties side by side by saving each analysis and adjusting one variable at a time to understand which factors most influence profitability in your target market.
→ Run multiple scenarios. Try different inputs to see how changes affect the outcome. Small differences in rates, terms, or amounts can have a large impact over time.
→ Use conservative estimates. When projecting future returns or growth, err on the low side. Optimistic assumptions lead to plans that fall short.
→ Compare before committing. Use the results alongside other financial calculators on this site to see the full picture before making a financial decision.
→ Bookmark for periodic check-ins. Financial situations change — revisit this calculator quarterly or when your circumstances shift to keep your plan on track.
See also: Extra Payment Calculator · Mortgage Points Calculator · PMI Calculator · House Hacking Calculator · Closing Cost Calculator