Enter Property and Financing Details
The page uses a stacked layout, while the calculator fields adapt to three columns on large screens, two on medium screens, and one on mobile.
Example Data Table
| Input Item | Example Value | Why It Matters |
|---|---|---|
| Purchase Price | $250,000 | Sets loan size, equity, cap rate, and return context. |
| Down Payment | $50,000 | Changes financing leverage and initial cash invested. |
| Monthly Rent | $2,300 | Drives gross income and future cash flow potential. |
| Other Monthly Income | $100 | Adds parking, laundry, storage, or fee revenue. |
| Vacancy Rate | 5% | Reduces collectible rent and reflects turnover risk. |
| Operating Expenses | $1,047 monthly | Combines taxes, insurance, reserves, and utilities. |
| Debt Service | $1,364 monthly | Shows financing pressure on real take-home cash flow. |
| Monthly Cash Flow | Calculated result | Measures spendable property income after core costs. |
Formula Used
- Loan Amount = Purchase Price − Down Payment
- Potential Gross Income = Monthly Rent + Other Monthly Income
- Vacancy Loss = Potential Gross Income × Vacancy Rate
- Effective Gross Income = Potential Gross Income − Vacancy Loss
- Management Fee = Effective Gross Income × Management Rate
- Maintenance Reserve = Potential Gross Income × Maintenance Rate
- CapEx Reserve = Potential Gross Income × CapEx Rate
- Operating Expenses = Fixed Expenses + Management + Maintenance + CapEx
- Monthly Mortgage Payment = P × [r(1+r)n] ÷ [(1+r)n − 1]
- Monthly NOI = Effective Gross Income − Operating Expenses
- Monthly Cash Flow = Monthly NOI − Monthly Mortgage Payment
- Cap Rate = Annual NOI ÷ Purchase Price × 100
- Cash-on-Cash Return = Annual Cash Flow ÷ Initial Cash Invested × 100
- Break-even Occupancy = (Operating Expenses + Debt Service) ÷ Potential Gross Income × 100
- Projected Sale Value = Purchase Price × (1 + Appreciation Rate)Holding Years
In the mortgage formula, P is the loan amount, r is the monthly interest rate, and n is the total number of monthly payments.
How to Use This Calculator
- Enter the property purchase price, down payment, and one-time buying costs.
- Add financing assumptions, including interest rate and loan term.
- Input rent, other income, and a realistic vacancy rate.
- Fill in taxes, insurance, HOA, utilities, management, maintenance, and reserve assumptions.
- Set growth, appreciation, holding period, and selling cost assumptions for projections.
- Press the calculate button to view monthly cash flow, annual returns, and future-year trends above the form.
- Use the CSV button for spreadsheet analysis and the PDF button for reports or client sharing.
Frequently Asked Questions
1. What does rental cash flow mean?
Rental cash flow is the money left after rent income covers vacancy, operating expenses, reserves, and debt payments. Positive cash flow means the property puts money in your pocket each month.
2. Why is vacancy included in the calculation?
Vacancy reflects lost income from tenant turnover, repairs, and leasing time. Ignoring it often makes a deal look better than reality, so including it creates a more conservative estimate.
3. What is the difference between NOI and cash flow?
NOI removes operating expenses from collected income but excludes financing. Cash flow goes one step further by subtracting mortgage payments, showing what remains after debt service.
4. Why track maintenance and CapEx separately?
Maintenance covers routine repairs, while CapEx reserves prepare for bigger replacements like roofs, HVAC units, or flooring. Keeping both helps prevent underestimating long-term ownership costs.
5. What is a good cash-on-cash return?
The answer depends on market risk, financing, property condition, and investor goals. Many investors compare cash-on-cash returns with alternative investments and required risk premiums before buying.
6. How does appreciation affect total return?
Appreciation increases the projected resale value over time. When combined with loan paydown and accumulated cash flow, it can materially improve total profit and long-term investment performance.
7. Can this calculator help compare multiple deals?
Yes. Use consistent assumptions across properties, then compare cash flow, cap rate, DSCR, break-even occupancy, and projected profit. That makes deal screening faster and more disciplined.
8. Should I rely only on this calculator before buying?
No. It is a strong screening tool, but you should still verify leases, taxes, insurance quotes, repair estimates, market rents, financing terms, and local regulations before committing capital.