Sheet & Flow
Launch offer: 20% off every product and bundle with code LAUNCH20 until October 14, 2026. Browse the store

Rental Calculator Pro

Offline browser app (download) · instant download via Gumroad · 30-day refund
Rental Calculator Pro preview
$12Buy on Gumroad20% off with LAUNCH20 Launch price $9.60 until October 14, 2026

Downloadable browser app that works offline: 10-year projection, IRR, max-offer price finder, saved deals, side-by-side comparison and CSV export.

A rental property calculator that answers the question that matters before you make an offer: what's the most I can pay and still hit my numbers?

Max offer price finder. Set your targets (for example at least $200/month cash flow, 8% cash-on-cash and a 1.25 DSCR) and Pro finds the highest purchase price that meets all of them, to the nearest $500, with the numbers at that price.

10-year projection with IRR. Rent growth, expense growth, appreciation, loan paydown, equity, net sale proceeds after selling costs, IRR and equity multiple for any hold period from 1 to 10 years.

Everything from year one. Monthly cash flow, NOI, cap rate, cash-on-cash, DSCR, break-even occupancy, GRM and the 1% rule, colored against common rules of thumb.

Saved deals, side-by-side comparison, CSV export and a printable report for a partner or lender.

How you get it

  • Buy here, then download the zip from your receipt email or your Gumroad library.
  • Open Rental-Property-Calculator-Pro-Offline.html in Chrome, Edge, Firefox or Safari on your computer. It's a single file that works offline. No account, no license key, no subscription.
  • A PDF guide with every formula is included.
  • Want to see it first? The free demo shows Pro's results for 3 sample deals: https://onyxaholguin-cyber.github.io/sheet-and-flow/tools/rental-property-calculator-pro/

Made for desktop and laptop browsers. Your deals are saved in that browser on your computer, and the app makes no network requests.

Tested: every output matched the Rental Deal Analyzer spreadsheet recalculated in LibreOffice (3 sample deals and 6 randomized ones, including 0% interest, all-cash and 1- and 10-year holds), and the max-offer finder was brute-force checked.

Not tax, legal or investment advice.

Built with AI assistance and tested by running it end to end (details in the guide).

Refunds: 30-day refund if it doesn't work as described (refund policy).

$12Buy on Gumroad20% off with LAUNCH20 Launch price $9.60 until October 14, 2026

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Checkout, delivery, receipts and sales tax are handled by Gumroad. Questions after purchase: reply to your Gumroad receipt email. Not tax, legal or financial advice.