Calculator
Investor mortgage calculator
Price a rental loan the way an investor actually borrows: fixed amortizing terms, interest-only that later amortizes, ARMs with caps, balloons, DSCR limits, hard-money draws, seller financing, and a second lien. The same engine feeds the multifamily pro forma.
The working calculator shows the payment jump, total interest, balloon date, PMI drop-off, points break-even, a refinance comparison, and the amortization schedule. PDF export is included after you start a trial.
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.