BiggerPockets Alternative · Updated 2026
The BiggerPockets rental property calculator is where a lot of investors get started. It's simple, it's accessible, and it teaches you the fundamentals of deal analysis — cash flow, cash-on-cash return, the 1% rule. For your first few deals, that's enough.
But as you move into multifamily — 10, 20, 50+ unit properties — the BP calculator starts showing its limits. You're manually entering every number from 40-page offering memos. There's no sensitivity analysis. No expense breakdown. No DSCR. No way to stress-test the deal before you make an offer. Dealyze picks up where the BP calculator leaves off.
From basic metrics to full underwriting — what each tool delivers.
| Feature | Dealyze | BP Rental Calculator |
|---|---|---|
| Auto-extract from PDF | Yes — AI reads OMs, T12s, rent rolls | No — manual entry only |
| Data entry method | Upload PDF, review & adjust | Type every field manually |
| Cash flow analysis | Yes | Yes |
| Cash-on-cash return | Yes | Yes |
| Cap rate | Automatic | Basic |
| DSCR (debt service coverage) | Automatic — critical for commercial loans | Not included |
| IRR projection | 5-year with exit assumptions | Not included |
| Vacancy sensitivity analysis | Auto: 3% through 15% | Single vacancy input only |
| Rent growth scenarios | Auto: -10% to +10% | Not included |
| Expense line items | Extracted from documents | Lump sum entry |
| Break-even occupancy | Automatic | Not included |
| Deal grade (A-F) | Composite score | Not included |
| Go / No-Go verdict | With reasoning | Not included |
| Excel export | 3-sheet workbook | PDF report (Pro) |
| Best for | Multifamily (5+ units) | SFR and small multifamily |
| Cost | From $29/mo (1 free analysis) | Free (basic) / $39/mo (Pro membership) |
The gaps that show up as you scale into larger multifamily deals.
When you're buying a duplex with a conventional mortgage, cash-on-cash return is the metric that matters. But when you step into commercial multifamily (5+ units), lenders underwrite to DSCR — debt service coverage ratio. If your DSCR is below 1.25, most commercial lenders won't touch the deal regardless of how good the cash flow looks on paper.
The BP calculator doesn't calculate DSCR. Dealyze calculates it automatically and flags deals where the DSCR is thin — because that's what determines whether you can actually get the loan.
With single-family properties, the key numbers are on the listing page — price, rent estimate, taxes, maybe an HOA fee. You can type those into the BP calculator in 5 minutes.
Multifamily deals come with offering memorandums — 20-50 page PDFs packed with financial tables, rent rolls, expense breakdowns, proforma projections, and market analysis. Finding the actual trailing income on page 23 and the real operating expenses on page 31 takes time. Transcribing all of it into a calculator takes even more time. And one typo can throw off the entire analysis.
The BP calculator shows you the deal at one set of assumptions. If you assumed 5% vacancy and $1,200/unit rent, you see one set of numbers. But what if vacancy runs at 10% for the first year while you stabilize? What if rents are actually $1,100/unit because the broker's proforma was aggressive?
Dealyze runs sensitivity analysis automatically on every deal. You see cap rate, DSCR, and cash-on-cash at five vacancy levels and seven rent scenarios. When you're negotiating price, you can say exactly how much room the deal has before it stops working — because you've already modeled it.
You learned the fundamentals on BiggerPockets. Now get the tools that match your ambition. Upload any multifamily offering memo and see the full underwriting report — DSCR, IRR, sensitivity tables, deal grade — in under 2 minutes. One free analysis, no account needed.