Learning Objectives

By the end of this lesson you will be able to:

• Define and calculate the eight core real estate financial metrics
• Explain what each metric measures and why it matters
• Apply the metrics to a real property listing to determine whether it warrants further analysis
• Recognize the limitations of each metric in isolation
• Use the metrics together to form a complete deal analysis

Core Content

The Eight Core Metrics

1. Gross Rental Income (GRI)

GRI = Total rent if all units are occupied at 100% for 12 months

GRI is the theoretical maximum income. No property operates at 100% occupancy indefinitely. GRI is the starting point, not the final number.

2. Gross Rent Multiplier (GRM)

GRM = Purchase Price ÷ Annual Gross Rent

GRM is a quick screening tool. Lower is generally better.

Example: A $240,000 property with $24,000 annual gross rent has a GRM of 10.

If the market standard GRM is 12, this property is priced attractively relative to income. If the market standard is 8, the property may be overpriced.

GRM does not account for expenses, vacancy, or financing. It is a filter, not an analysis.

3. Net Operating Income (NOI)

NOI = Gross Rental Income
    - Vacancy Allowance
    - Operating Expenses (taxes, insurance, management, maintenance, utilities)

NOI is the property's income before debt service. It represents what the property earns regardless of how it is financed.

NOI is the most important income metric. It is used to calculate cap rate, property value, and debt service coverage.

4. Capitalization Rate (Cap Rate)

Cap Rate = NOI ÷ Purchase Price (or Current Market Value)

Cap rate converts income into value and is used to compare properties across markets and sizes.

Example: A property with $20,000 NOI purchased for $333,333 has a 6% cap rate.

Cap rates are market-specific and property-type specific:

• Low cap rate (3–5%) = expensive market, lower risk perceived
• High cap rate (7–10%) = less expensive market, higher risk perceived

5. Cash-on-Cash Return (CoC)

CoC = Annual Cash Flow After Debt Service ÷ Total Cash Invested

CoC measures the return on your actual out-of-pocket investment, incorporating financing.

Example:

• Cash invested: $60,000 (down payment + closing costs + repairs)
• Annual cash flow: $5,400
• CoC = $5,400 ÷ $60,000 = 9%

6. Debt Service Coverage Ratio (DSCR)

DSCR = NOI ÷ Annual Debt Service (mortgage payments)

DSCR measures the property's ability to cover its mortgage. Lenders use this metric to approve loans.

• DSCR of 1.0 = income exactly covers the mortgage
• DSCR of 1.25 = income is 25% higher than the mortgage (common lender minimum)
• DSCR below 1.0 = income does not cover the mortgage; investor must contribute cash monthly

7. 50% Rule (Estimation Tool)

A quick estimation: operating expenses on a residential rental are approximately 50% of gross rents.

This includes taxes, insurance, management, maintenance, capital expenditures, and vacancy — but not the mortgage.

The 50% Rule is not precise. It is a screening tool to quickly estimate whether a property deserves deeper analysis.

If 50% of gross rent cannot cover the mortgage, the property probably does not cash flow.

8. 1% Rule (Screening Tool)

A property passes the 1% Rule if:

Monthly Rent ≥ 1% × Purchase Price

Example: A $200,000 property should generate at least $2,000/month in rent to pass the 1% Rule.

In many markets today, the 1% Rule is difficult to achieve. It remains useful as a screening threshold to identify markets and property types worth analyzing further.

Applying the Metrics Together

No single metric makes a deal good or bad. Use them together:

1. Screen with GRM and the 1% Rule
2. Calculate NOI to assess income quality
3. Calculate cap rate to compare against market standards
4. Apply financing and calculate DSCR to confirm lender eligibility
5. Calculate CoC to determine your actual return on invested capital
6. Stress-test: what happens to CoC if vacancy increases by 5%? If rents fall 10%?

Common Mistakes

• Using GRI without vacancy — properties are never 100% occupied. Always apply a vacancy factor.
• Ignoring capital expenditures — roofs, HVAC systems, appliances, and plumbing eventually need replacement. Budget for them.
• Underestimating maintenance — older properties have higher maintenance costs. Budget 10–15% of GRI for properties over 20 years old.
• Ignoring management fees — even self-managed properties have a management cost (your time). Budget for professional management to keep analysis honest.
• Cap rate confusion — cap rate measures income yield, not total return. A low cap rate in a high-appreciation market may still produce strong total returns.

Application

Find a residential rental property listing in any market. Using the asking price and estimated rents:

1. Calculate the GRM
2. Estimate NOI using the 50% Rule
3. Calculate the cap rate
4. Estimate CoC assuming 25% down at a 7% interest rate, 30-year mortgage
5. Does the property pass initial screening? Why or why not?