Rental Property Cash Flow & Cap Rate Calculator
A rental property calculator evaluates investment profitability by measuring net cash flow, Capitalization Rate (Cap Rate), and Cash-on-Cash Return (CoC) to compare real estate deals.
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📐 Formula
💡 Practical Example
$300,000 purchase price, 25% down payment ($75,000), 7.0% 30-year mortgage, $2,800/mo rent, $900/mo expenses. - Monthly Net Operating Income (NOI): $2,800 - $900 = $1,900.00/month. - Capitalization Rate (Cap Rate): ($22,800 ÷ $300,000) × 100 = 7.60%. - Monthly Net Cash Flow: $1,900.00 - $1,496.93 = +$403.07/month. - Cash-on-Cash Return (CoC): ($4,836.84 ÷ $75,000) × 100 = 6.45%.
📖 About Rental Property Cash Flow & Cap Rate Calculator
A rental property calculator evaluates investment profitability by measuring net cash flow, Capitalization Rate (Cap Rate), and Cash-on-Cash Return (CoC) to compare real estate deals.
To use the Rental Property Cash Flow & Cap Rate Calculator, enter your Property Purchase Price, Down Payment Percentage, Mortgage Interest Rate and other values. The calculator instantly computes Net Monthly Cash Flow, Capitalization Rate (Cap Rate) and more. Results update in real time as you change any input — no submit button needed.
How to Use This Calculator
Enter your Property Purchase Price (e.g. 300000 in ), Down Payment Percentage (e.g. 25 in %), Mortgage Interest Rate (e.g. 7.0 in %), Gross Monthly Rent Collected (e.g. 2800 in /month), and Monthly Operating Expenses (Taxes, Ins, Mgmt, Maint) (e.g. 900 in /month). Results update instantly as you type — no submit button or page reload required. Adjust any value to compare scenarios side by side.
The Formula
Net Operating Income (NOI) = (Monthly Rent - Monthly OpEx) × 12
Monthly Cash Flow = Monthly Rent - Monthly OpEx - Monthly Mortgage P&I Payment
Cap Rate % = (Annual NOI ÷ Purchase Price) × 100%
Cash-on-Cash Return % = (Annual Cash Flow ÷ Total Initial Cash Outlay) × 100%
Worked Example
300,000 purchase price, 25% down payment (75,000), 7.0% 30-year mortgage, 2,800/mo rent, 900/mo expenses.
- Monthly Net Operating Income (NOI): 2,800 - 900 = 1,900.00/month.
- Capitalization Rate (Cap Rate): (22,800 ÷ 300,000) × 100 = 7.60%.
- Monthly Net Cash Flow: 1,900.00 - 1,496.93 = +403.07/month.
- Cash-on-Cash Return (CoC): (4,836.84 ÷ 75,000) × 100 = 6.45%.
Understanding Your Result
Evaluate your result against the specific financial decision driving this calculation. Small input differences can create large output swings — run two or three scenarios (conservative, base, optimistic) to understand the range of outcomes. For decisions involving more than a month's income, validate your result against a second source or consult a certified financial planner (CFP) or CPA depending on the tax implications.
💡 Real Estate: Financial & Legal Considerations
- Real estate calculations assume stable market conditions. Actual values, tax rates, and income are volatile — recalculate quarterly for active decisions.
- The Consumer Financial Protection Bureau (CFPB) provides free homebuyer resources. Obtain a professional appraisal before any major transaction.
- Factor all carrying costs: property taxes (avg 1.1% nationally), insurance (0.5–1%), HOA, maintenance (1–2% of value annually), and vacancy rates.
- Mortgage qualification requires reviewing DTI ratio, credit score (min 620 for conventional, 580 for FHA), employment history, and liquid reserves.
- Closing costs typically range 2–5% of the purchase price in the US. Budget for these separately — they are not included in down payment calculations.
- The 28/36 qualifying rule: housing costs should not exceed 28% of gross income; total debt should not exceed 36% for conservative underwriting.
- Investment property returns must account for management fees (8–12%), turnover costs, and capital expenditure reserves — not just gross rent.
- Real estate is illiquid. Always maintain separate liquid emergency reserves independent of any property investment or equity.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.