Rental Property Calculator
Calculate the gross yield, net yield, cash-on-cash return, and monthly net income on any rental property before committing to the investment.
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Enter your values above to see the results.
Tips & Notes
- ✓Use the 1% rule as a screening tool — monthly rent should equal at least 1% of purchase price for a property to be worth analyzing further in most interest rate environments.
- ✓Budget 35-45% of gross rent for operating expenses (taxes, insurance, maintenance, management, vacancy) before calculating cash flow — ignoring expenses produces dangerously optimistic projections.
- ✓The debt service coverage ratio (annual NOI divided by annual mortgage payments) should exceed 1.25 — below this, the property cannot service its own debt without drawing on reserves.
- ✓Vacancy rate matters more than most new investors realize — a 5% vacancy assumption on a $2,000/month property reduces annual income by $1,200, which can flip a marginally positive to negative cash flow.
- ✓Management fees of 8-12% of rent dramatically reduce net cash flow — factor these in even if you plan to self-manage initially, since circumstances change.
- ✓Local rent-to-price ratios determine viability — high-appreciation markets often have rent-to-price ratios that make positive cash flow impossible with financing; high-yield markets compensate with cash flow rather than appreciation.
Common Mistakes
- ✗Projecting cash flow without accounting for vacancy — assuming 100% occupancy inflates income by 5-10% compared to realistic 90-95% occupancy assumptions.
- ✗Underestimating maintenance and capital expenditure reserves — budget 1-2% of property value annually for maintenance plus set aside for major systems (roof $10,000-$20,000, HVAC $5,000-$10,000, water heater $1,500).
- ✗Not including property management fees in the analysis even when self-managing — self-management has real time and opportunity costs, and you may need to hire management later.
- ✗Confusing gross yield with net yield — a 9% gross yield property with 40% expense ratio produces only a 5.4% net yield, which changes the investment thesis entirely.
- ✗Ignoring the financing cost when comparing to all-cash returns — cap rate measures unlevered return; cash-on-cash measures the levered return on invested capital, which is what actually matters for leveraged investors.
- ✗Purchasing based on pro-forma income projections provided by sellers — always verify current rent rolls, vacancy history, and actual operating expenses before accepting any seller-provided numbers.
Rental Property Calculator Overview
A rental property calculator evaluates the financial performance of an income-producing real estate investment. Unlike a primary residence where the mortgage is the main metric, rental property analysis requires modeling all income and all expenses to determine whether the investment generates positive cash flow, what return it produces on invested capital, and whether it justifies the risk.
The three core return metrics — gross yield, net yield, and cash-on-cash return — answer different questions and should all be evaluated before any purchase decision.
What each field means:
- Property Value — the purchase price of the investment property
- Interest Rate — the mortgage rate; investment properties carry 0.5-0.75% premium over primary residence rates
- Loan Term — repayment period; 30-year maximizes cash flow, shorter terms build equity faster
- Down Payment — percentage required; typically 20-25% for investment properties
What your results mean:
- Monthly Payment — principal and interest on the mortgage; the primary fixed cost
- Loan Amount — the financed balance after down payment
- Total Paid — all mortgage payments over the full term
- Total Interest — complete financing cost over the loan life
- Gross Yield — annual rent divided by property value; the top-line return before any expenses
- Net Yield — annual rent minus all operating expenses divided by property value; the true income return
Example — $320,000 property, 25% down ($80,000), 7.5% rate, 30-year term, $2,100/month rent:
Loan amount: $240,000 Monthly P&I: $1,678 Gross yield: ($2,100 x 12) / $320,000 = 7.88% Operating expenses (35% of rent): $735/month Net Operating Income: $2,100 - $735 = $1,365/month Cash flow after mortgage: $1,365 - $1,678 = -$313/month (negative) Cash-on-cash return (if positive): NOI x 12 / $80,000 down This property is cash flow negative — the 1% rule ($3,200/month needed) is not met. For positive cash flow: need rent of at least $2,400/month or a lower purchase price.
EX: Same property — how purchase price changes the investment viability Purchase at $320,000 + $2,100 rent: -$313/month cash flow (negative) Purchase at $280,000 + $2,100 rent: -$110/month cash flow (negative but closer) Purchase at $250,000 + $2,100 rent: +$104/month cash flow (marginally positive) Purchase at $220,000 + $2,100 rent: +$328/month cash flow (viable investment) At 7.5% rates, the rent must be 1.1-1.2% of purchase price for positive cash flow.
Monthly cash flow by rent and mortgage payment:
| Monthly Rent | P&I $1,400 | P&I $1,700 | P&I $2,000 |
|---|---|---|---|
| $1,800 | -$170 | -$470 | -$770 |
| $2,200 | +$230 | -$70 | -$370 |
| $2,600 | +$630 | +$330 | +$30 |
| $3,000 | +$1,030 | +$730 | +$430 |
Cap rate vs cash-on-cash return — $320,000 property, 25% down, 7.5% rate:
| Monthly Rent | Gross Yield | Cap Rate (est.) | Cash-on-Cash |
|---|---|---|---|
| $2,100 | 7.9% | 5.1% | negative |
| $2,500 | 9.4% | 6.1% | 2.1% |
| $3,000 | 11.3% | 7.3% | 6.2% |
| $3,500 | 13.1% | 8.6% | 10.3% |
Most residential rental properties purchased with significant leverage at current mortgage rates produce negative or breakeven cash flow unless rent is unusually high relative to price. Investors who purchase negative cash flow properties are betting on appreciation to generate returns — a strategy that has worked in major markets over long periods but requires capital reserves to sustain losses during vacancies and market downturns. Positive cash flow from day one provides a margin of safety that appreciation alone cannot replicate.
Frequently Asked Questions
Gross rental yield above 8% is generally considered strong for residential rental property. Net yield (after operating expenses) above 5-6% is typically the threshold for a cash-flowing investment. Cash-on-cash return — the actual cash flow divided by the down payment — should ideally exceed 6-8% to justify the risk and illiquidity of real estate versus other investments. These benchmarks vary significantly by market: high-appreciation markets typically have lower yields compensated by price growth, while high-yield markets offer stronger cash flow with more modest appreciation. A property generating 10%+ gross yield in a stable market is exceptional.
The 1% rule states that monthly rent should equal at least 1% of the purchase price for a property to generate positive cash flow. A $250,000 property should rent for at least $2,500/month. This is a quick screening tool only — at current interest rates of 7-8%, the 1% rule often produces barely positive or negative cash flow after full operating expenses. At lower historical interest rates (3-4%), the 1% rule produced robust positive cash flow. In many markets today, finding properties that meet the 1% rule requires focusing on smaller markets, fixer-uppers, or multi-family properties rather than turnkey single-family homes in competitive markets.
Cash flow = Gross rent minus operating expenses minus mortgage payment. Operating expenses typically include: property taxes (1-2% of value annually), insurance (0.25-0.5% of value annually), maintenance and repairs (1% of value annually), property management (8-12% of rent), vacancy allowance (5-10% of rent), and capital expenditure reserve (5-10% of rent). A simplified estimate: operating expenses total approximately 35-45% of gross rent. Net Operating Income (NOI) = Gross rent minus operating expenses. Cash flow = NOI minus mortgage payment. Positive cash flow means the property generates income; negative means the investor funds the shortfall monthly.
Cap rate (capitalization rate) is Net Operating Income divided by property value, expressed as a percentage. It measures the unlevered return on a property — what it would yield if purchased all-cash. A $300,000 property generating $18,000 in annual NOI has a 6% cap rate. Cap rates allow comparing properties of different sizes and prices in the same market, and comparing your property to prevailing market cap rates. Higher cap rates indicate higher income relative to price (and typically higher risk or less desirable locations). Lower cap rates indicate lower income relative to price (typically higher quality or high-appreciation markets). Buying above the prevailing market cap rate means you overpaid relative to the income the property generates.
Leverage amplifies both gains and losses. A property that appreciates 5% generates a 5% return if purchased all-cash but a 25% return on a 20% down payment (5% gain on 100% of value with only 20% invested). However, the mortgage creates a fixed obligation that must be paid regardless of market conditions, vacancies, or expenses. Negative cash flow properties require the investor to fund the shortfall monthly from other income. The optimal leverage level balances the return amplification against the cash flow risk — most experienced investors target properties that cash flow positively with 20-25% down, ensuring the investment sustains itself without external subsidies.
Rental property owners can deduct: mortgage interest, property taxes, insurance premiums, maintenance and repair costs, property management fees, advertising costs, professional fees (accounting, legal), travel expenses related to the property, and depreciation. Depreciation is particularly powerful — residential rental property is depreciated over 27.5 years, allowing a $250,000 property (minus land value) to generate approximately $8,000-$9,000 in annual non-cash deductions that offset rental income. When combined with mortgage interest and operating expense deductions, many properties show a tax loss even when generating positive cash flow. Consult a tax professional familiar with real estate investing before making depreciation decisions.