About the Rental Property Calculator
Rental Property Calculator helps estimate the key numbers involved in mortgage & real estate decisions. It is designed for quick scenario comparison: enter a realistic set of values, calculate the result, then change one assumption at a time to see what has the greatest effect. Unlike a static table, the result responds to your inputs and keeps the calculation in your browser. Amounts are displayed in U.S. dollars for consistency, but the mathematical formulas can be used with another currency when every monetary input uses that same currency.
How to use this calculator
Enter values that match your situation and select Calculate result. Review the main result and its supporting figures, then change one input at a time to compare scenarios. Results are rounded for readability while the calculation retains additional precision internally.
Information you will need
- Starting amount
- Monthly contribution
- Annual return
- Years
How the calculation works
Projects growth with monthly compounding and contributions. Read the primary result together with the supporting values rather than focusing on one number alone. A useful estimate should make its assumptions visible. If the answer looks surprising, verify the unit, rate, time period, and whether the entered value is gross or net. Run a conservative and an optimistic scenario to understand the range of possible outcomes.
Formula or method
FV = P(1+r)n + C((1+r)n - 1)/r.
Worked example
$10,000 + $250/month at 7% for 10 years.
The example is illustrative rather than a recommendation. Use your own verified values and keep all monetary or measurement units consistent. When comparing alternatives, save or note each result so the assumptions do not become mixed.
How to interpret the result
The primary output answers the main question posed by the rental property calculator, while the additional cards provide context. A result with many decimal places is not necessarily more certain. The displayed precision makes comparison easier, but uncertainty in the inputs can be larger than the rounding difference.
Compare the result with a second scenario using a less favorable rate, return, cost, or time period. This sensitivity check often provides more useful planning information than one best-case projection.
Limitations and important notes
The rental property calculator is a planning tool, not a quote, filing calculation, lending decision, or promise of future performance. It does not automatically retrieve live market rates or apply every fee, tax bracket, program rule, product limit, or state law. Rules for products such as FHA, VA, Social Security, retirement accounts, and taxes can change. Confirm time-sensitive values with the lender, plan administrator, IRS, SSA, or another relevant authority before acting.
Frequently asked questions
How do I calculate rental property cash flow?
Cash flow equals monthly rent minus all expenses: mortgage payment, property taxes, insurance, HOA fees, maintenance, property management, and a vacancy allowance. Positive cash flow means the property pays for itself each month. On a $2,000/month rent with $1,700 in expenses, cash flow is $300/month. This calculator projects monthly and annual cash flow based on your inputs so you can evaluate whether a deal works.
What is a good cap rate for rental property?
Cap rate equals annual net operating income divided by property price. A 5-10% cap rate is generally considered good depending on location and property type. Higher cap rates mean higher returns but may indicate higher risk or less desirable locations. Lower cap rates, common in expensive cities, often rely on appreciation rather than rental income. Compare your cap rate against similar properties in the same market to judge a deal fairly.
What expenses should I include for rental property?
Include the mortgage (principal and interest), property taxes, insurance, HOA fees, maintenance, a vacancy allowance of 5-10% of rent, property management fees of 8-12% if you hire a manager, and capital expenditures for big items like roofs and HVAC. Many investors also budget 1-2% of the property value annually for maintenance. Missing these costs can turn a seemingly profitable property into a money loser.
What is the 1% rule for rental properties?
The 1% rule says monthly rent should equal roughly 1% of the property's purchase price. A $250,000 property should rent for about $2,500 per month. It is a quick screening filter, not a guarantee of profit, since you still need to account for vacancy, maintenance, taxes, and insurance. Properties meeting the 1% threshold are more likely to produce positive cash flow, while markets below 0.5-0.7% often rely on appreciation rather than monthly income.
What is cash-on-cash return?
Cash-on-cash return measures the annual pre-tax cash flow you earn relative to the cash you actually invested. Calculate it by dividing annual cash flow by total cash invested, which includes your down payment plus closing costs. If you invest $60,000 and earn $6,000 in annual cash flow, your cash-on-cash return is 10%. It is the most useful metric for comparing how efficiently your actual cash is working, especially for investors using leverage.
How much vacancy should I budget for rental property?
Investors typically budget a 5-10% vacancy allowance per year, even if the unit has never sat empty. Vacancy covers time between tenants, marketing costs, and occasional unpaid rent. On $2,400/month rent, an 8% vacancy allowance sets aside about $192/month or $2,300 per year. Forcing this reserve into your cash-flow projection prevents an empty month from wiping out your annual profit. Local rental demand and tenant turnover history help you adjust the percentage.
What is the difference between gross and net rental yield?
Gross yield divides annual rental income by the property price; a $300,000 property renting for $2,500/month has a 10% gross yield. Net yield, or net operating income, subtracts operating expenses like property taxes, insurance, maintenance, management, and vacancy before dividing by the price. Net yields are typically 2-4% lower than gross yields. Always evaluate net yield and cash flow, since gross yield ignores the real costs of operating a property.