Investment Property Calculator

Real estate investing requires rigorous separation between asset-level profitability and debt-financing leverage. This Investment Property Calculator

Finance

Property Purchase Price

Total acquisition price of the real estate asset

Gross Monthly Rental Income

$/mo

Expected total monthly rent collected from all units

Annual Operating Expenses (Non-Mortgage)

$/yr

Property taxes, insurance, maintenance, vacancy reserve, and property management (strictly excludes mortgage)

Down Payment Percentage

Equity capital invested upfront as a down payment

Mortgage Interest Rate

Annual interest rate on the property mortgage loan

Mortgage Loan Term

years

Amortization schedule in years (typically 30 or 15 years)

Formula & Methodology

NOI = Gross Rent − OpEx | Cap Rate = (NOI ÷ Price) × 100 | Cash-on-Cash = (Cash Flow After Debt ÷ Cash Invested) × 100

Net Operating Income (NOI) strictly reflects operational performance by deducting non-mortgage operating expenses (taxes, insurance, maintenance, vacancy, management) from gross rent. The Cap Rate evaluates unleveraged asset yield, while Cash-on-Cash measures the leveraged return generated on actual out-of-pocket down payment equity.

Net Operating Income: $27,000/yr | Cash-on-Cash: 8.23%

7.71% Cap Rate Cap Rate

Overview

Real estate investing requires rigorous separation between asset-level profitability and debt-financing leverage. This Investment Property Calculator models complete residential and commercial property cash flows, distinguishing Net Operating Income (NOI) and Cap Rate from leveraged Cash-on-Cash Return.

Educational & Real Estate Disclaimer: This calculator models property economics under user-specified financial assumptions. It is not investment, legal, or real estate advice. Calculations do not account for unplanned capital expenditures, sudden tenant vacancies, or local income taxes. Consult a real estate CPA or licensed broker.

Worked Examples

Acceptance Standard: $350,000 Property, $3,000/mo Rent, $9,000/yr OpEx, 20% Down at 6.5%

Price = $350,000, Rent = $3,000/mo ($36,000/yr), OpEx = $9,000/yr, 20% Down ($70,000), 6.5% 30-Yr Loan ($280,000).

Calculate Gross Income: $3,000 × 12 = $36,000/year.
Calculate NOI: $36,000 − $9,000 = $27,000/year (strictly excludes mortgage).
Compute Cap Rate: ($27,000 ÷ $350,000) × 100 = 7.71%.
Compute monthly mortgage payment on $280,000 loan at 6.5%: $1,769.79/month.
Annual Debt Service: $1,769.79 × 12 = $21,237.48/year.
Annual Cash Flow: $27,000 (NOI) − $21,237.48 (Debt Service) = +$5,762.52/year.
Compute Cash-on-Cash Return: ($5,762.52 ÷ $70,000 down payment) × 100 = 8.23%.
Gross Rent Multiplier (GRM): $350,000 ÷ $36,000 = 9.72.

Final Answer: 7.71% Cap Rate | 8.23% Cash-on-Cash | +$5,763/yr Cash Flow

All-Cash Purchase (No Mortgage Leverage)

Price = $250,000, Rent = $2,200/mo ($26,400/yr), OpEx = $6,400/yr, 100% Down.

Gross rent: $26,400. NOI: $26,400 − $6,400 = $20,000/year.
Cap rate: ($20,000 ÷ $250,000) × 100 = 8.00%.
With zero debt service, Cash-on-Cash equals Cap Rate exactly: 8.00%.

Final Answer: 8.00% Cap Rate | 8.00% Cash-on-Cash

High-Cost Metro Example with Lower Cap Rate

Price = $800,000, Rent = $4,500/mo ($54,000/yr), OpEx = $14,000/yr.

NOI: $54,000 − $14,000 = $40,000/year.
Cap Rate: ($40,000 ÷ $800,000) × 100 = 5.00%.
GRM: $800,000 ÷ $54,000 = 14.81.

Final Answer: 5.00% Cap Rate | 14.81 GRM

How to Use This Calculator

Enter property acquisition purchase price and expected gross monthly rental income.

Enter annual operating expenses (ensure property taxes, insurance, vacancy reserves, and repairs are included).

Enter your down payment percentage, mortgage interest rate, and loan term.

Review the resulting Net Operating Income, Cap Rate, debt service obligations, and Cash-on-Cash return.

Frequently Asked Questions

Why does Net Operating Income (NOI) exclude mortgage payments?

NOI evaluates the commercial profitability of the real estate asset itself, regardless of how it is financed. Two investors buying identical $300,000 properties—one paying cash and one borrowing 90%—own assets with the identical NOI and Cap Rate, though their cash-on-cash returns differ dramatically.

What is the difference between Cap Rate and Cash-on-Cash Return?

Capitalization Rate (Cap Rate) measures the unleveraged rate of return of the property assuming an all-cash purchase. Cash-on-Cash return measures the actual leveraged cash yield on your invested out-of-pocket equity down payment after paying mortgage debt service.

What expenses should be included in operating expenses?

Operating expenses include property taxes, hazard/flood insurance, routine maintenance and repairs, property management fees, HOA dues, landscaping, and a reserve allowance for vacancy (typically 5% to 8% of rent). It excludes mortgage payments, capital improvements (roof replacement), and income taxes.

What is a "good" Cap Rate for residential investment property?

Cap rates generally range between 4% and 10%. Lower cap rates (4% to 5%) are typical in high-demand, appreciating coastal metropolitan areas with lower perceived risk. Higher cap rates (8% to 10%+) are common in smaller or rural markets where property appreciation is slower and tenant risk is higher.

What is the 1% Rule in real estate?

The 1% rule is an informal screening rule of thumb suggesting that a property’s gross monthly rent should equal at least 1% of its purchase price to generate positive cash flow. For a $300,000 property, the 1% rule targets $3,000/month in rent.