BRRRR calculator — buy, rehab, rent, refinance, with the math showing.
Model the whole sequence: a hard-money purchase and rehab, then a refinance into a long-term DSCR loan at the after-repair value. See how much cash the refi returns, what stays in the deal, and whether the property still cash-flows on the new loan.
Every figure above is computed by the same audited engine that powers BuyBox — audited against industry-standard real-estate math. Estimates, not investment advice.
This is one metric. BuyBox runs the whole underwrite — verdict in about 30 seconds.
How the BRRRR math actually works
BRRRR stands for buy, rehab, rent, refinance, repeat. The financial event that makes it work is the refinance: a long-term lender sizes a new loan against the after-repair value (here at your chosen LTV), that loan pays off the short-term hard money that funded the purchase and rehab, and whatever remains — after refinance costs — comes back to you. If the ARV is strong enough, you recover most or all of your cash while keeping the property; the classic failure mode is an optimistic ARV that leaves you with a thin refi and all your cash stuck.
Two things this page won't do: it doesn't estimate your ARV (that comes from comps — here's how to calculate ARV honestly), and it doesn't model a seasoning period or appraisal shortfall. The mechanics behind every figure are in BRRRR basics.