Rental Property Cash Flow Calculator
Analyze the potential profitability of your real estate investment by calculating monthly cash flow, Cap Rate, and Cash-on-Cash Return.
Purchase Details
Income & Expenses
Investment Analysis
Understanding Rental Property Cash Flow
Successful real estate investing relies on accurate math, not just intuition. This calculator helps you determine if a property is an asset (puts money in your pocket) or a liability (takes money out). Below is a breakdown of the key metrics used in this specific calculation.
1. Net Operating Income (NOI)
NOI is a critical metric that calculates the profitability of an income-generating real estate property before adding in any costs from financing (like your mortgage) or taxes. It is calculated as:
NOI = (Total Monthly Income) – (Operating Expenses excluding Mortgage)
2. Capitalization Rate (Cap Rate)
The Cap Rate measures the natural rate of return on the property, assuming it was bought entirely with cash. It is the gold standard for comparing properties of different prices and locations. A higher Cap Rate generally indicates a better return, though often with higher risk.
- Formula: (Annual NOI / Purchase Price) × 100
- Target: Investors often look for Cap Rates between 4% and 10%, depending on the market.
3. Cash-on-Cash Return
This is arguably the most important metric for leveraged investors. It measures the cash income earned on the cash invested (your down payment and closing costs). Unlike Cap Rate, this metric takes your debt service (mortgage) into account.
- Formula: (Annual Pre-Tax Cash Flow / Total Cash Invested) × 100
- Insight: If you put $50,000 down and make $5,000 a year in profit, your Cash-on-Cash return is 10%.
The 50% Rule and Maintenance
In our calculator, we include a field for "Maintenance/Vacancy %". A common rule of thumb in real estate is that 50% of your gross rent will eventually go toward operating expenses (taxes, insurance, repairs, vacancy) over time. Always budget conservatively for repairs to ensure your cash flow remains positive.