Flip · Rentals · Multifamily · Mortgage

Underwrite deals
at terminal speed.

Run a flip, a short-term rental, a five-year multifamily pro forma, or an investor mortgage, then send a branded PDF before the other offer lands.

Start 48-hour trial →See a demo deal

$19/mo after trial · Works on any phone (PWA)

Calculators: Flip + STR
Export: Branded PDF
Platform: Mobile-first PWA

ROI · demo deal

0.00%

Committed $119,460 · sample data

Deal report

Your logo · 1 tap

9:41Sample

RE Underwrite LabDEMO

Fix & FlipShort-Term Rental

Demo deal · sample dataLive calc

Net profit

Profitable

ROI

17.83%

Committed capital

$119,460

Deal trajectoryFrom this deal

AcquireRehabListSell

HomeCalculatorsDealsAccount

Fix & Flip

ARV, purchase, a single rehab budget, hold costs, and up to three liens. Loan basis can be ARV, purchase plus rehab, or purchase price. Net profit, ROI, cash to close, and committed capital update as you type.

Fix & Flip overview

Short-term rental

Purchase, amortizing loan, income, and operating costs, plus a startup estimator you can edit line by line. Cash flow, cash-on-cash, and 1 to 30 year returns. No seasonality model in this version.

Short-term rental overview

Multifamily

A five-year pro forma from unit mix, vacancy, operating expenses, and the shared loan engine. Cap rate, DSCR, cash-on-cash, break-even occupancy, and IRR at an exit cap.

Multifamily overview

Investor mortgage

Fixed, interest-only, ARM, balloon, DSCR, hard money, seller financing, and a second lien. Payment changes, PITI, and a full amortization schedule.

Mortgage overview

Not in this version

Line-item repair estimator, comps, seasonality, BRRRR, wholesale, a single-family buy-and-hold calculator, and a native app. The flip calculator uses a lump-sum rehab budget on purpose.

Estimates only. Not financial, legal, tax, or investment advice. RE Underwrite Lab calculators and PDF reports provide educational estimates based on the numbers you enter. Actual purchase costs, rents, expenses, financing terms, taxes, insurance, vacancy, rehab costs, refinance eligibility, and returns vary by property, market, lender, and local law (including short-term rental rules). We do not guarantee any outcome, profit, cash flow, or appraisal. Some content and tools may be generated or assisted by artificial intelligence and can contain errors. Always verify assumptions with licensed professionals and your own due diligence before making decisions.