Real Estate Investment Calculator

Analyze Any Real Estate Investment in Minutes

Real estate investing involves more variables than almost any other investment — purchase price, financing terms, rental income, vacancy, operating expenses, property taxes, insurance, maintenance, property management, appreciation, and tax benefits all interact to determine whether a property is a goldmine or a money pit. Our calculator models all of these factors to produce the metrics that matter: cash flow, cap rate, cash-on-cash return, total ROI, and break-even occupancy.

Enter the property details (price, down payment, mortgage terms), income assumptions (monthly rent, vacancy rate), and expense estimates (taxes, insurance, maintenance, management). The calculator produces a comprehensive investment analysis including monthly and annual cash flow, cap rate, cash-on-cash return, and multi-year projections with appreciation.

Key metrics explained: Cap rate = Net Operating Income ÷ Property Price (measures return independent of financing). Cash-on-cash return = Annual pre-tax cash flow ÷ Total cash invested (measures return on your actual dollars invested). A property with a 7% cap rate and 10% cash-on-cash return is performing well in most markets.

The Five Numbers That Define Every Real Estate Deal

1. Net Operating Income (NOI)

NOI = Gross rental income - Vacancy loss - Operating expenses. This is the property’s income before mortgage payments and taxes. Operating expenses include property taxes, insurance, maintenance/repairs (budget 1–2% of property value/year), property management (8–12% of collected rent if using a manager), utilities paid by owner, HOA fees, and landscaping.

Example: $2,400/month rent × 12 = $28,800 gross income. Minus 8% vacancy ($2,304). Minus operating expenses ($9,600: $3,600 taxes + $1,800 insurance + $2,400 maintenance + $1,800 management). NOI = $16,896/year.

2. Cap Rate (Capitalization Rate)

Cap rate = NOI ÷ Purchase price. It measures the property’s return independent of how you finance it — as if you paid all cash. Cap rate = $16,896 ÷ $250,000 = 6.76%. Higher cap rates indicate higher returns (but often higher risk). Cap rates vary by market — 4–5% in expensive coastal cities, 7–10% in smaller markets and secondary cities. A cap rate below your mortgage interest rate means the property generates negative cash flow without significant down payment.

3. Cash-on-Cash Return

Cash-on-cash = Annual pre-tax cash flow ÷ Total cash invested. This measures the return on your actual out-of-pocket investment. If you invested $60,000 (down payment + closing costs) and the property produces $4,896/year in cash flow after mortgage: cash-on-cash = 8.16%. This is the most useful metric for comparing real estate to other investments (stocks, bonds) because it measures return on your deployed capital.

4. Monthly Cash Flow

Monthly cash flow = Monthly rent - Vacancy allocation - Monthly operating expenses - Monthly mortgage payment. Positive cash flow means the property puts money in your pocket each month. Negative cash flow means you’re subsidizing the investment from other income. The goal for most investors: positive cash flow from day one, even if modest.

5. Total Return (ROI)

Total return combines four sources of real estate profit: cash flow (monthly income after all expenses and mortgage), appreciation (property value increase over time — historically 3–4% nationally), loan paydown (each mortgage payment includes principal that builds your equity), and tax benefits (depreciation deductions, mortgage interest deductions, capital gains treatment).

A property might produce only 3% cash-on-cash return but 12%+ total annualized return when you include appreciation, loan paydown, and tax benefits. This is why real estate can be a powerful wealth-building tool even when monthly cash flow seems modest.

The 1% Rule and 50% Rule (Quick Screening)

The 1% rule: Monthly rent should be at least 1% of the purchase price. A $200,000 property should rent for at least $2,000/month. Properties meeting this threshold are more likely to generate positive cash flow. In expensive markets (San Francisco, New York, Boston), the 1% rule is nearly impossible — these markets rely on appreciation rather than cash flow.

The 50% rule: Approximately 50% of gross rental income goes to operating expenses (excluding mortgage). On $2,400/month rent, expect approximately $1,200/month in expenses. This leaves $1,200 for mortgage payment and cash flow. If your mortgage payment exceeds $1,200, the property likely has negative cash flow. This rule is a rough estimate — actual expenses vary, but it’s useful for quick mental math when screening properties.

These rules are starting filters, not final analysis. Always run complete numbers through the calculator before making an offer.

Financing Strategies for Investment Properties

Conventional investment property loans require 20–25% down payment, carry rates 0.5–0.75% higher than primary residence loans (approximately 7–8% in 2026), and require strong credit (700+) and cash reserves (6 months of payments). Maximum 10 financed properties per borrower under conventional guidelines.

DSCR (Debt Service Coverage Ratio) loans qualify based on property cash flow rather than personal income — ideal for self-employed investors and those scaling beyond 10 properties. The property’s rent must cover the mortgage payment by 1.0–1.25×. Rates are typically 0.5–1.5% higher than conventional. Down payment: 20–25%.

House hacking: Buy a 2–4 unit property as your primary residence (3.5% down with FHA, 5% with conventional), live in one unit, and rent the others. The rental income offsets your mortgage, often covering 50–100% of the payment. This is the lowest-barrier entry into real estate investing — you get owner-occupied rates and low down payment while building a rental portfolio.

BRRRR strategy: Buy, Rehab, Rent, Refinance, Repeat. Purchase a below-market property, renovate to increase value, rent it out, refinance based on the new higher value (pulling out most or all of your invested cash), and use those funds to purchase the next property. This allows scaling a portfolio with limited capital but requires renovation expertise and access to initial capital (hard money or private lending for the purchase and rehab).