A BiggerPockets calculator alternative that runs on the listing
The BiggerPockets rental property calculator is many investors' first analysis tool, and the education around it (forums, books, podcasts) is genuinely unmatched. The calculators themselves are browser forms: you enter a property's numbers and get a detailed report, with full use tied to a Pro membership after a limited number of free reports.
Mortar takes the same core math and moves it onto the Zillow listing itself. No form to fill: it reads price, address and details off the page, applies real per-state property tax and insurance, and returns the verdict in seconds. And the core analysis is free every month, no membership required.
Side by side
| Mortar | BiggerPockets calculators | |
|---|---|---|
| Where you analyze | In a popup on the Zillow listing you already have open | A web form on biggerpockets.com, per property |
| Data entry | Read automatically from the listing page | Manual entry per property |
| Math transparency | Deterministic formulas, shown line by line | Clear report; assumptions you set per run |
| Local taxes & insurance | Real per-state property tax + insurance applied automatically | You look up and enter your own figures |
| Free usage | 5 free analyses a month, no credit card | Limited free reports; full use requires Pro membership |
| Best for | Fast screening while browsing Zillow | Learning the analysis and producing detailed reports |
Comparison checked July 2026, based on public information. We are not affiliated with BiggerPockets calculators, and features change; verify against their site.
What BiggerPockets calculators does well
- The deepest education ecosystem in real estate investing: forums, guides, podcasts
- Detailed, lender-shareable calculator reports
- Covers rentals, BRRRR, flips and more within the BP ecosystem
- A huge, active community to sanity-check your assumptions
Pricing compared
BiggerPockets calculators come with the Pro membership (which includes much more than calculators); see biggerpockets.com for current pricing. Mortar is free for 5 analyses a month, with Pro at $29 a month for unlimited analyses, buy-box scoring and history.
If you are early in your investing education, BiggerPockets the community is worth your time regardless of which calculator you use.
Which should you pick?
Pick BiggerPockets when you want education plus analysis in one membership and do not mind entering each property by hand. Pick Mortar when you already know what you are looking for and want every Zillow listing pre-screened with honest local costs.
Try Mortar on a real listing
Free to start, no credit card. Or run the numbers by hand with the free rental property calculator.
Related reading: The best Zillow Chrome extensions for real estate investors