fmr.fyi – Fair Market Rent Research Helper

About

Instant Cash Flow Analysis and FMR Data on Real Estate Listings

fmr.fyi is a Chrome extension that helps investors, property managers, and homebuyers evaluate rental properties while browsing real estate listings. Choose between two display modes: view monthly cash flow calculations or display Fair Market Rent (FMR) data directly on supported sites, eliminating the need for manual calculations or separate tools.

The extension detects property details such as address, price, bedroom count, and HOA fees, then shows an on-page indicator based on your selected mode. In Cash Flow mode, you'll see estimated monthly cash flow calculations. In FMR mode, you'll see the Fair Market Rent value for the property. Selecting the indicator opens a detailed analysis view with HUD FMR and Small Area FMR data, local tax rates, mortgage assumptions, and customizable expense inputs.

Key Features

Two Display Modes:
- Cash Flow Mode: Shows monthly cash flow estimates based on several customizable factors
- FMR Mode: If you'd rather see the raw data and do the calculations yourself, this mode does just that.

Two Rent Source Modes:
- Effective Rent Mode: Uses FMR OR local market rates, whichever is lower. This allows you to consider HUD rent reasonableness requirements in your search.
- FMR Mode: Uses just the FMR with no consideration of local market rates.

On-page indicators shown directly on listings
Uses official HUD FMR and SAFMR data in tandem with local market rates from last ~365 days
Automatically detects and includes HOA fees when available (Cash Flow mode)
Configurable assumptions for financing, taxes, and expenses (Cash Flow mode)
Supports Zillow, Redfin, Realtor.com, and Homes.com
Works on list views, map views, expanded map cards, and property detail pages
Enable or disable the extension per site

Privacy

All calculations run locally in your browser. No personal data or browsing activity is collected or stored.