Rental Property ROI Calculator

Evaluating Rental Property Returns: The Core Metrics

Real estate investment is only as strong as its numbers. Emotions and appreciation hopes don't pay mortgages—cash flow does. This calculator provides the three essential metrics every investor needs before making an offer.

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📊 The Three Key Return Metrics

1. Cap Rate (Capitalization Rate) > Cap Rate = Net Operating Income (NOI) ÷ Purchase Price × 100

Assumes you paid all cash. Measures the property's inherent earning power independent of financing. Use this to compare properties apples-to-apples regardless of how you finance them.

| Cap Rate | Market Interpretation | |---|---| | Below 4% | Low-yield (premium location, high appreciation) | | 4–6% | Moderate yield (suburban markets) | | 6–8% | Strong yield (Midwest, Sun Belt secondary cities) | | Above 8% | High yield (may indicate higher risk or lower appreciation) |

2. Cash-on-Cash Return (CoC) > CoC = Annual Pre-Tax Cash Flow ÷ Total Cash Invested × 100

Measures your actual return on the cash you put in (down payment + closing costs). This is what actually hits your bank account. Unlike cap rate, CoC reflects your financing structure.

A property with a 6% cap rate and 20% down at 7% mortgage rate will have a CoC return lower than 6%—because your debt service consumes some of the NOI.

3. Net Operating Income (NOI) > NOI = Gross Rental Income − Vacancy − Operating Expenses (excl. mortgage)

The property's raw earnings before debt service. Higher NOI = more cushion to cover mortgage and still cash flow.

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📋 The Full Expense Stack: What Investors Underestimate

Beginner investors often only subtract the mortgage from rent. Here's the complete operating expense picture:

| Expense Category | Typical Rate | |---|---| | Vacancy & Credit Loss | 5–10% of gross rent | | Repairs & Maintenance | 1% of property value/year | | Property Management | 8–12% of gross rent (if using manager) | | Property Taxes | 0.5–2.5% of value/year (varies by state) | | Landlord Insurance | $1,000–$3,000/year | | HOA Fees (if applicable) | $0–$5,000+/year | | Capital Expenditures (roof, HVAC, appliances) | 1–2% of value/year reserved |

Example: $500,000 property, $3,000/month rent

| | Monthly | |---|---| | Gross Rent | $3,000 | | Vacancy (8%) | −$240 | | Repairs (1% of value/12) | −$417 | | Property Management (10%) | −$300 | | Property Tax (1.2%/12) | −$500 | | Insurance | −$150 | | CapEx Reserve (1.5%/12) | −$625 | | Net Operating Income** | **$768/month | | Mortgage (20% down, 7% rate) | −$2,661 | | Monthly Cash Flow** | **−$1,893 |

This property cash-flows negatively at these numbers—illustrating why detailed analysis beats gut feel.

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📏 The 1% Rule: A Quick Filter, Not a Decision

The 1% Rule: monthly rent ≥ 1% of purchase price. A $300,000 property should rent for $3,000+/month.

In most 2026 US markets, achieving the 1% rule is difficult:

• San Francisco / NYC: Often 0.3–0.5% (appreciation play)
• Dallas / Atlanta: 0.6–0.8% (balanced markets)
• Cleveland / Detroit: 1.0–1.5% (cash flow markets, lower appreciation)

Use the 1% rule as a screening filter to eliminate obviously poor performers, then run complete numbers on survivors.

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🏦 Leverage: How Financing Amplifies Returns

With 20% down on a $400,000 property ($80,000 invested):

• No appreciation: CoC return equals cap rate minus debt cost
• 5% annual appreciation**: Property gains $20,000/year → $20,000 gain on $80,000 invested = **25% return on invested cash—even if the property cash-flows modestly

This leverage effect is why real estate creates wealth—appreciation on the full asset value, not just your down payment. It also amplifies losses in declining markets.