Every real estate investor has looked at a listing and thought, “this could work.” The math in their head says yes. The actual math — when you account for vacancy, maintenance, property management, insurance, and taxes — often says something different.
The DDH Rental Property ROI Calculator runs the real numbers: cash-on-cash return, cap rate, net operating income, monthly cash flow, and your break-even timeline. Before you make an offer, you’ll know if the deal actually pencils out.
What “ROI” Actually Means for Rental Property
Rental property has four distinct return streams, and most beginner investors only track one.
Cash flow — what hits your account monthly after mortgage, expenses, and vacancies.
Equity paydown — your tenant is paying down your mortgage each month. On a $300,000 property, that’s roughly $3,000–4,000/year in equity built without you writing a check.
Appreciation — historically 3-4% annually for US real estate, though highly market-dependent and the least reliable of the four.
Tax benefits — depreciation alone can shelter thousands of dollars in rental income from taxes each year.
The rental property ROI calculator quantifies all four and shows your total return, not just your monthly cash flow number.
What the Calculator Shows
Enter your property details and the calculator outputs:
- Monthly cash flow (gross rent minus all expenses)
- Annual cash-on-cash return (cash flow / cash invested)
- Cap rate (NOI / property value)
- Gross rent multiplier (quick sanity check)
- Break-even occupancy rate
- 5-year and 10-year equity projection
The Expenses Most Investors Forget
| Expense | Typical Range | Default |
|---|---|---|
| Vacancy | 5–10% of gross rent | 8% |
| Repairs & maintenance | 1% of property value/year | 1% |
| Property management | 8–12% of rent collected | 10% |
| Insurance | $100–200/mo | $150 |
| CapEx reserve | 5–8% of rent | 7% |
| Property tax | Varies by market | Enter manually |
Most investors use 50% of gross rent as a rough “expense ratio” for ballpark math. The calculator lets you get specific.
FREE BONUS: The Rental Property Due Diligence Checklist
37 questions to answer before you make an offer — includes the expense categories most buyers miss.
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How the DDH Rental Property ROI Calculator Works
Here’s a real example.
Property: 3-bedroom single family, purchase price $285,000. You’re putting 25% down ($71,250). The seller is claiming $2,100/month rent.
Step 1: Enter the purchase price, down payment, and your financing terms (7.25% on a 30-year investment loan). Mortgage payment comes out to $1,575/month.
Step 2: Enter the gross rent: $2,100/month. Apply the expense defaults:
- Vacancy (8%): -$168
- Property management (10%): -$210
- Repairs (1% of value/year): -$238/mo
- Insurance: -$150
- CapEx reserve (7%): -$147
Step 3: The calculator shows effective monthly income of $1,187 after expenses, mortgage payment of $1,575, and monthly cash flow of -$388.
This deal loses $388/month. The listing agent’s math ignored vacancy, management, and reserves. The rental property ROI calculator caught it in 3 minutes.
Adjust the assumptions — maybe you self-manage (save $210/mo) and put 30% down (lower payment). Suddenly you’re at $47/month positive cash flow. Thin, but possible. Now you have an informed negotiation position.
→ Try the DDH Rental Property ROI Calculator free: ddh-saas-app.vercel.app/signup
What Makes a Good Rental Property Deal?
Cash-on-cash return: Aim for 6–10%+ in most markets. Under 5% means you’re betting on appreciation, not cash flow.
Cap rate: 5–8% is typical for decent markets. Under 4% is appreciation play territory. Over 10% usually means high risk.
Monthly cash flow: Many investors target $200–400/door minimum after all expenses. Cash flow under $100/door leaves almost no margin for surprises.
Break-even occupancy: If your property needs 95%+ occupancy to cover expenses, one difficult tenant cycle could wipe out a year of profits.
Your Next Move
Right now (2 minutes): Pull a listing you’re considering and run it through the calculator with realistic expense assumptions — not the listing agent’s math.
This week: Run at least 5 properties through the calculator. The ones that look similar on paper often perform very differently when you account for local tax rates and management costs.
Long game: Track actual income and expenses in the DDH dashboard and compare to your projections.
Still here? You’re serious about real estate.
Join 1,200+ users running deals through DDH calculators before they buy.
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