Calculator Inputs
Example Data Table
Use this sample scenario to understand expected inputs and compare your own property assumptions.
| Variable | Example Value | Why It Matters |
|---|---|---|
| Units | 4 | Scales rent potential and occupied-unit estimates. |
| Monthly Rent per Unit | $1,250 | Defines the core annual rent stream. |
| Occupancy Rate | 94% | Models vacancy drag on collected income. |
| Additional Monthly Income | $150 | Captures parking, laundry, storage, or pet fees. |
| Operating Expenses | $15,660 annually | Includes recurring costs that reduce NOI. |
| Annual Loan Payments | $14,800 | Converts NOI into true investor cash flow. |
Formula Used
Gross Scheduled Rent = Units × Monthly Rent per Unit × 12
Gross Scheduled Income = Gross Scheduled Rent + (Additional Monthly Income × 12)
Vacancy Loss = Gross Scheduled Income × (1 − Occupancy Rate)
Effective Gross Income = Gross Scheduled Income − Vacancy Loss
Management Fee = Effective Gross Income × Management Fee Rate
Operating Expenses = Tax + Insurance + Maintenance + HOA + Utilities + Management + Repairs Reserve + Capital Reserve + Other Annual Expenses
NOI = Effective Gross Income − Operating Expenses
Annual Net Cash Flow = NOI − Annual Loan Payments
Cap Rate = NOI ÷ Purchase Price
Cash on Cash Return = Annual Net Cash Flow ÷ (Down Payment + Closing Costs + Initial Rehab)
Break-even Occupancy = (Monthly Break-even Income − Additional Monthly Income) ÷ Potential Monthly Rent
How to Use This Calculator
- Enter the number of rentable units and the monthly rent for each unit.
- Add any extra monthly income such as parking, laundry, storage, or late fees.
- Set the expected occupancy rate to reflect tenant turnover and local demand.
- Fill in annual and monthly expenses, including reserves and management fees.
- Include loan payments and acquisition costs if you want financing metrics.
- Press the submit button to display results above the form.
- Review NOI, cash flow, cap rate, expense ratio, and break-even occupancy.
- Use the CSV and PDF buttons to save the results for sharing.
Frequently Asked Questions
1. What does this rental income calculator estimate?
It estimates gross scheduled income, vacancy loss, effective gross income, operating expenses, NOI, annual cash flow, monthly cash flow, cap rate, DSCR, and break-even occupancy for a rental property.
2. Why is vacancy included in the calculation?
Vacancy reduces collected rent. Even strong properties lose income during turnover, nonpayment, or seasonal demand changes. Including vacancy makes projected income more realistic and improves pricing, budgeting, and financing decisions.
3. What is NOI and why is it important?
NOI, or net operating income, measures property income after operating expenses but before financing. Investors use it to compare buildings consistently, calculate cap rate, and evaluate underlying property performance.
4. Should mortgage payments be treated as operating expenses?
No. Mortgage payments are financing costs, not operating expenses. They should be separated from NOI so you can judge property operations independently and then evaluate true cash flow after debt service.
5. What does cash on cash return show?
Cash on cash return shows annual net cash flow relative to actual cash invested. It helps investors compare leveraged opportunities and judge how efficiently their upfront capital is working.
6. How should I estimate management and maintenance costs?
Use real quotes when possible. Otherwise, apply a conservative management percentage and a maintenance allowance that reflects property age, tenant profile, deferred repairs, and local labor costs.
7. What does break-even occupancy mean?
Break-even occupancy is the minimum occupancy needed to cover operating expenses and debt service. Lower values generally indicate a safer income cushion during weaker leasing periods.
8. Can I use this for single-family and multi-unit properties?
Yes. The calculator works for single-family rentals, duplexes, apartments, and small portfolios. Enter the correct unit count, rent assumptions, and property-specific expenses for each scenario.