Free rental calculator

Know if a rental is worth buying in under 60 seconds

Cash flow, cap rate, cash-on-cash, DSCR, and BRRRR — every number a seasoned investor runs, the moment you type an address. No spreadsheets, no sign-up to start.

Ask any scenario

Describe a deal — get the math, in plain English

2 free scenario runs · No credit card required

Investor holding a property surrounded by its financial metrics

Monthly cash flow

+$2,119Grade A

How it works

From listing to decision in three steps

No spreadsheets, no formulas to memorize. Just answers.

1

Enter the numbers

Type in the address, price, and rent — or pull live tax, value, and rent-comp data automatically.

2

See metrics update live

Cash flow, cap rate, cash-on-cash, and DSCR recalculate instantly as you change any input.

3

Decide with confidence

Get a graded verdict on the deal, then save it to your portfolio to compare against the rest.

Model how a portfolio compounds over time

Built for investors who move fast

Turn a listing into a decision before someone else makes an offer

  • Every metric, the moment you type

    Cash flow, cap rate, cash-on-cash, and DSCR recalculate live — no formulas to remember, no tabs to wire up.

  • Real data, not guesses

    Pull live property tax, assessed value, and rent comps so you can underwrite a listing from just an address.

  • A grade you can trust

    Every deal gets one honest letter grade that ties the whole picture together — buy, pass, or dig deeper.

Every metric that matters

The full underwriting picture, instantly

The same numbers a seasoned investor runs — without the spreadsheet.

Cash flow

How much money you keep each month after expenses and mortgage.

Cap rate

Annual profit on your investment — the percentage your property makes.

Cash-on-cash

Your annual return on the actual money you put down.

DSCR

Your income compared to the mortgage — whether lenders will fund it.

BRRRR

Buy, repair, rent, refinance strategy — how much cash returns.

Short-term rental

Airbnb vs. traditional rent — which pays more monthly.

1% rule & GRM

Quick financial screens — does this deal make sense?

Deal grade

A-F rating that tells you if it's worth pursuing.

BRRRR & value-add

Model the whole buy-rehab-rent-refinance cycle

Enter the purchase, rehab budget, after-repair value, and refi terms — Investaar shows your cash left in the deal, the new cash flow, and whether the numbers actually work.

Run a BRRRR scenario
A distressed property transformed into a renovated rental
Before · distressedAfter · +$58k ARV

Why investors switch

Spreadsheets and all-in-one suites, beaten on speed

Investaar does one thing — tell you if a rental is worth buying — and does it faster. Try it free with 2 AI scenario runs, no sign-up.

FeatureSpreadsheetsAll-in-one suitesInvestaar
Time to first answerHours~15 minUnder 60 sec
Free to try
Yes
No
2 free AI runs
Metrics update live as you type
No
Partial
Yes
Automatic deal grade
No
No
Yes
BRRRR & short-term rental built in
No
Yes
Yes
Pulls live tax & rent-comp data
No
Partial
Yes
Learning curveSteepMediumNone

Built with trust

Your data is safe

Built by a solo founder who understands your business. Transparent, secure, and focused on getting you answers fast.

Encrypted & Private

Your property data and financial information are encrypted in transit and at rest. We never sell or share your information.

You Control Your Data

Save only what you want. Delete your account anytime and all your data is permanently removed.

Built for Professionals

Estimates only — not financial advice. Always verify numbers with a CPA or lender before deciding.

Questions about your data or privacy?

Read our privacy policy or email me directly.

Popular questions

Everything you need to know

Still curious? Just start analyzing a deal — it's free.

Yes — you get 2 free scenario runs, no account or card needed. After that, create your account and subscribe: full access to everything from day one, with no free trial to expire on you.

Investaar is built to do one thing exceptionally well: tell you whether a rental is worth buying, in under a minute. There's no paywall to run the numbers and no forums or courses to wade through.

Cash flow, cap rate, cash-on-cash return, DSCR, the 1% rule, gross rent multiplier, plus BRRRR and short-term-rental analysis — all updating live as you type.

No. Investaar can pull live property tax, assessed value, and rent comps so you can analyze a listing with just an address.

Yes. Saved deals live in your portfolio dashboard so you can compare cash flow, cap rate, and grades side by side.

Anyone screening rental properties — first-time buyers, BRRRR and short-term-rental investors, and agents who want to show clients the numbers fast.

Yes. We never sell or share your data. Property addresses and financial information are encrypted in transit and at rest. We store only what you explicitly save to your portfolio. You can delete your account and all your data anytime.

No. Investaar's calculations are estimates only — not financial, investment, or tax advice. Always verify numbers with a CPA, lender, or tax professional before making investment decisions.

Ready to analyze your next deal?

Run the numbers on any rental in under a minute — free, no sign-up required to start.

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