A free, private calculator for analyzing a rental or BRRRR deal: monthly cash flow, cap rate, cash-on-cash return, NOI, and mortgage payment — updated live as you type.
▶ Use it: https://myastroapp.github.io/rental-calculator/
- Monthly & annual cash flow after mortgage and operating expenses
- Cap rate (NOI ÷ price) and cash-on-cash return (cash flow ÷ cash invested)
- NOI, mortgage P&I, and total cash invested
- A one-time Pro unlock downloads a professional PDF deal report — all metrics, a 5-year cash-flow / equity projection, and year-by-year amortization — to save or bring to a lender or partner
Free, no sign-up — plain-English explainers for rental investors:
- How to analyze a rental property
- What is NOI? · What is a good cap rate? · Cash-on-cash return
- What is DSCR? · How much cash flow should a rental make?
- The BRRRR method · The 1% rule · House hacking
- Rental property tax deductions
Everything runs locally in your browser. No accounts, no tracking, nothing uploaded. The figures you enter never leave your device.
Estimates only — verify with your lender and a local agent before making an offer.
- JSON & developer tools — viewer, formatter, converters, JWT, Base64, regex, and more
- Invoice / estimate / receipt generator — free, no sign-up
- Resume builder + cover letter + ATS checker — free, private