Quick start
- Open the Rental Property Calculator.
- Start with the fields shown on the Rental Property Calculator page and enter values in the same units used by the labels.
- Use the first example, "Rental house: $300k property renting for $2,400/mo", if you want to see a filled-out estimate before entering your own values.
- Calculate, read the formula line, then copy the result only after the amounts, rates, and term look right.
Best uses
These are the situations this tool is meant for. If your task is close to one of these, the examples and notes below can help you choose the right inputs.
- Screen whether monthly rent covers estimated costs.
- Estimate cap rate before financing effects.
- Estimate cash-on-cash return after mortgage payment.
- Compare vacancy, maintenance, and expense assumptions.
What this calculator is for
Use this free rental property calculator to estimate mortgage payment, operating expenses, monthly cash flow, NOI, cap rate, and cash-on-cash return. It is best for screen whether monthly rent covers estimated costs. and for comparing scenarios before you rely on a number.
Good fit examples: Screen whether monthly rent covers estimated costs. Estimate cap rate before financing effects.
What to enter
Finance estimates are sensitive to small input changes. Check whether a field expects a monthly amount, annual amount, dollar value, or percent before calculating.
- Start with the fields shown on the Rental Property Calculator page and enter values in the same units used by the labels.
- Use annual rates as percentages, such as 6.5 for 6.5%, and keep monthly amounts in monthly fields.
- Try the first example first: $300k property renting for $2,400/mo. Then replace one number at a time so you can see what changed.
Example walkthrough
Try the calculator example: Rental house: $300k property renting for $2,400/mo. The example result is Cash flow and cap rate.
- Rental house uses $300k property renting for $2,400/mo, and the result focuses on cash flow and cap rate.
- Use condo as a quick comparison so the guide is not based on only one scenario.
Formula and steps
In plain language: The calculator subtracts vacancy and operating expenses from rent for NOI, subtracts mortgage payment for cash flow, then compares NOI and cash flow with property price and cash invested. If the result seems too high or too low, first check whether each field expects a monthly amount, annual amount, dollar value, or percent.
The formula line on the calculator page is there so the number is not a black box. If the estimate is surprising, check the formula line and the inputs before using the answer in a budget, comparison, or planning note.
How to read the answer
Start with the headline result. Then read the supporting lines to see what made the number larger or smaller, such as rate, term, principal, tax, fees, or contributions.
- Read the large answer first, because it is the main result the calculator is built around.
- Then read the supporting lines. They explain what drove the result, such as payment, interest, total cost, savings gap, return, or time.
- In plain language: The calculator subtracts vacancy and operating expenses from rent for NOI, subtracts mortgage payment for cash flow, then compares NOI and cash flow with property price and cash invested. If the result seems too high or too low, first check whether each field expects a monthly amount, annual amount, dollar value, or percent.
Common mistakes to avoid
Most bad finance estimates come from mixing rates, terms, monthly amounts, and annual amounts. The other common mistake is using a planning estimate as if it were a final quote.
- Do not mix monthly and annual amounts.
- Do not copy an answer before checking the rate and term.
- This does not include depreciation, income tax, repairs timing, tenant risk, rent control, property management contracts, refinancing, or local landlord rules. Real finance decisions can also depend on fees, timing, local rules, credit details, and provider-specific terms.
What to try next
A related calculator can help check the same money question from another angle before you rely on one result.
- Try real estate calculator next to compare the same question from another angle.
Sources and estimate notes
This guide links to public financial, consumer, statistical, or tax references where they are useful for understanding the calculator context.
Source links improve transparency, but they do not turn a quick calculator into professional advice or a final loan, tax, payroll, or investment answer.
Examples from the calculator
Cash flow and cap rate
Cash-flow estimate
Return estimate
FAQ in plain language
When should I use the Rental Property Calculator?
Use it for early planning and side-by-side comparisons, especially for tasks like these: Screen whether monthly rent covers estimated costs. Estimate cap rate before financing effects. Treat the answer as a planning estimate, not a final quote.
What is the Rental Property Calculator doing with my numbers?
In plain language: The calculator subtracts vacancy and operating expenses from rent for NOI, subtracts mortgage payment for cash flow, then compares NOI and cash flow with property price and cash invested. If the result seems too high or too low, first check whether each field expects a monthly amount, annual amount, dollar value, or percent.
What does this estimate leave out?
This does not include depreciation, income tax, repairs timing, tenant risk, rent control, property management contracts, refinancing, or local landlord rules. Real finance decisions can also depend on fees, timing, local rules, credit details, and provider-specific terms.
Related tools
- Real Estate Calculator Estimate property sale profit, ROI, and equity multiple from purchase and sale numbers.
- Mortgage Calculator Estimate monthly principal, interest, taxes, insurance, PMI, and HOA costs.
- ROI Calculator Calculate simple return on investment from initial investment, ending value, income, and costs.
Privacy and copying results
Recent answers stay visible only while you work in the current browser tab. They are not sent to a server.
Use Copy answer when you want to paste the expression and result into notes, homework, a message, or another document. Check the units and assumptions before copying.