Don't guess if a deal pencils out. Run the numbers.

Cap rate, cash-on-cash return, DSCR, and a buy/pass verdict — for single-family, duplex, multi-unit, commercial, and short-term rental deals. Pull comps, save every analysis, and compare deals side by side before you ever write an offer.

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The problem

Analyzing a deal shouldn't feel like this.

Every listing 'looks' good until you run it

A Zillow screenshot and a gut feeling aren't underwriting. Vacancy, capex reserves, and financing terms all move the answer — and most of that math never happens before an offer goes in.

You've got instinct. You don't have benchmarks.

Is 6% cap rate good for a duplex? Is 9% cash-on-cash enough for a short-term rental, given the extra risk? Every property type has a different bar, and guessing which one applies isn't a strategy.

You shouldn't need a $500/mo platform to know if it pencils

The math is well-established — cap rate, cash-on-cash, DSCR, the 1% rule. It doesn't require an enterprise subscription, just a tool that runs it correctly for the property type you're actually looking at.

How it works

Built for how deals actually get underwritten — not a single spreadsheet formula wearing five different labels.

A duplex house-hack, a 20-unit apartment building, and a short-term rental don't get evaluated the same way — so they don't share a calculator here either.

Five calculators, not one formula reskinned

Single-family, duplex, multi-unit (5+), commercial, and short-term rental each get their own input model and verdict benchmarks — a duplex house-hack and a 20-unit income property aren't underwritten the same way.

Real comps, not a scraped guess

MLS-style value and rent comps pull from the RentCast API — actual nearby sales and rental listings, with the comparables shown so you can sanity-check the estimate yourself.

Stress-tested, not a single scenario

Toggle Downside / Base / Upside on any result and watch cap rate, cash flow, and the verdict recompute instantly — see whether the deal still works if rent comes in lower or vacancy runs higher, not just under the numbers you hoped for.

Financing modeled the way lenders actually do it

Loan points, PMI that automatically stops once you cross 80% loan-to-value, and a BRRRR cash-out refinance calculator showing exactly how much cash you get back out — not just a flat mortgage payment.

The plan

Three steps. Everything else is detail.

Pick your property type

Single-family, duplex, multi-unit, commercial, or short-term rental — each with a calculator built for how that deal actually gets underwritten.

Pull comps, run the numbers

Paste an address for RentCast comps, fill in what you know, and get cap rate, cash-on-cash return, DSCR, the 1%/50% rules, and a buy/pass verdict.

Save it, compare it, print it

Every analysis saves to your portfolio, rankable by whatever metric matters to you, with a printable report for the ones you're serious about.

The payoff

A clear buy/pass verdict, not just a wall of numbers

Every calculator scores the deal against benchmarks built for that property type and gives you a straight answer — Strong Buy, Good Investment, Marginal, or Pass — plus the full metric breakdown behind it.

Preview

Strong Buy

Cap rate

7.2%

Cash-on-cash

11.4%

DSCR

1.38

Cash flow

$412/mo

Without running the numbers

· Offer on a deal that looked fine until the vacancy assumption changed
· Find out the DSCR doesn't clear your lender's bar after you're under contract
· Compare deals from memory instead of side by side
· No record of what you actually assumed when you made the call

With Investment Property Analyzer

· A verdict built on the benchmarks that actually apply to that property type
· Comps pulled before you rely on a guess
· Every saved analysis ranked and compared in one portfolio view
· A printable report you can hand to a lender or a partner

Create your free account and see if your next deal pencils out.

No credit card, no catch — just an email and a password.

Start free — no credit card