Rental Property Calculator

The Rental Property Calculator helps real estate investors evaluate potential rental properties by analyzing cash flow, key investment metrics, and long-term projections. Whether you're buying your first rental or expanding your portfolio, this calculator provides a comprehensive analysis to help you make data-driven decisions.

Key Metrics Explained

Cap Rate (Capitalization Rate)

Cap rate measures a property's income potential independent of financing. It's calculated as Net Operating Income (NOI) divided by purchase price, expressed as a percentage. A higher cap rate indicates better income relative to price, but may also signal higher risk. Typical ranges:

• 3-5%: Core markets (coastal cities, high appreciation areas)
• 5-8%: Value-add opportunities in stable markets
• 8-12%+: Higher-yield markets, potentially higher risk

Cash-on-Cash Return (CoC)

Cash-on-cash return measures the annual pre-tax cash flow as a percentage of total cash invested (down payment + closing costs + repairs). Unlike cap rate, CoC accounts for financing — making it especially useful for comparing leveraged investments. Most investors target 8-12% or higher.

DSCR (Debt Service Coverage Ratio)

DSCR compares your Net Operating Income to annual mortgage payments. A DSCR of 1.0 means income exactly covers debt service. Most lenders require 1.25 or higher for investment property loans. A DSCR below 1.0 means you'll need to cover the shortfall out of pocket.

GRM (Gross Rent Multiplier)

GRM is the purchase price divided by annual gross rent. A lower GRM suggests better value relative to rental income. It's a quick comparison tool — most properties fall between 4x and 20x depending on the market.

The 1% Rule

A quick screening tool: monthly rent should be at least 1% of the purchase price. A $200,000 property should rent for at least $2,000/month. While not a comprehensive analysis, it's a useful first filter for identifying potential cash flow properties.

Break-Even Ratio

The break-even ratio shows what percentage of gross income goes to operating expenses and debt service. A lower ratio means more cushion. Most investors want this below 85%.

How to Use This Calculator

1. Enter property details: Input the purchase price, down payment percentage, interest rate, and loan term.
2. Add rental income: Enter the expected monthly rent you'll charge tenants.
3. Specify expenses: Fill in property tax, insurance, HOA fees, vacancy rate, maintenance, management fees, and any other costs.
4. Set growth assumptions: Enter expected annual appreciation and rent increase rates.
5. Review the analysis: Examine the deal score, cash flow breakdown, charts, and 30-year projection to evaluate the investment.

Deal Score Grading

The Deal Score (0-100) rates the overall quality of the investment based on four equally weighted factors: cap rate, cash-on-cash return, monthly cash flow, and DSCR. The letter grades are:

Frequently Asked Questions

What is a good cap rate for rental property?

A good cap rate typically ranges from 5% to 10%, depending on the market. In high-demand coastal cities, 3-5% is common because property values are higher. In smaller markets or rural areas, 8-12%+ is achievable. Higher cap rates often come with higher risk or less appreciation potential.

What is cash-on-cash return and why is it important?

Cash-on-cash return measures your actual cash yield on the money you invested. Unlike cap rate (which ignores financing), CoC shows how well your invested dollars are performing. A CoC of 8-12% is generally considered good, meaning you earn $8,000-$12,000 annually for every $100,000 invested.

What is the 1% Rule in real estate investing?

The 1% Rule is a quick screening tool: a rental property's monthly rent should be at least 1% of the purchase price. A $250,000 property should rent for at least $2,500/month. It's a rough guideline, not a guarantee of profitability — always run a full analysis.

What is DSCR and why do lenders care about it?

DSCR (Debt Service Coverage Ratio) compares your property's Net Operating Income to annual mortgage payments. A DSCR of 1.25 means your income is 25% above your debt payments, providing a safety buffer. Lenders typically require 1.25+ because it shows the property can sustainably cover its debt.

How is Net Operating Income (NOI) calculated?

NOI = Gross Rental Income − Vacancy Loss − Operating Expenses. Operating expenses include property tax, insurance, maintenance, HOA, and management fees. Importantly, NOI does not include mortgage payments — it measures the property's income potential before debt service.

What vacancy rate should I use?

A 5% vacancy rate is standard for stable markets (roughly 2-3 weeks vacant per year). In competitive rental markets, 3-4% may be realistic. In areas with higher turnover or seasonal demand, use 8-10%. Being conservative with vacancy helps avoid overestimating returns.

Related Concepts

• Capitalization Rate — Wikipedia
• Gross Rent Multiplier — Wikipedia
• Debt Service Coverage Ratio — Wikipedia