NYC Affordability Calculators
The Problem
New York City housing searches usually start with the same question: “What can I actually afford?”
That question is harder in NYC than in many other markets. A co-op buyer may need enough cash for a down payment, closing costs, and post-close reserves. A condo buyer has to think about property taxes, common charges, mortgage recording tax, mansion tax, and lender debt-to-income limits. A renter may be screened against the 40x rent rule while also needing enough cash for move-in costs.
Most affordability tools answer only part of the question. I built NYC Affordability as a set of focused calculators for people searching for NYC apartment affordability, NYC home affordability, and more specific questions like:
- NYC apartment affordability calculator
- NYC home affordability calculator
- NYC co-op affordability calculator
- NYC condo affordability calculator
- NYC rent affordability calculator
- How much apartment can I afford in NYC?
- How much home can I afford in NYC?
- How much co-op can I afford in NYC?
- How much condo can I afford in NYC?
- How much rent can I afford in NYC?
The Solution
NYC Affordability is a free suite of single-page calculators for apartment hunters, home buyers, and renters. Each calculator starts from a user’s real financial profile and works backward to estimate an affordable purchase price or monthly rent.
The project currently includes:
- NYC Co-op Affordability Finder for estimating a maximum co-op purchase price using income, assets, down payment, closing costs, debt-to-income limits, and post-close reserve requirements.
- NYC Condo Affordability Calculator for estimating a maximum condo purchase price using mortgage assumptions, common charges, property taxes, insurance, mansion tax, mortgage recording tax, and lender DTI limits.
- NYC Rent Affordability Finder for estimating a maximum affordable monthly rent using income, assets, the 40x income rule, broker fee assumptions, security deposit limits, and move-in cash requirements.
The goal is not to replace a mortgage professional, real estate attorney, or broker. The goal is to give New Yorkers a fast, transparent starting point before they spend time touring apartments that are outside their practical budget.
Architecture
The app is intentionally simple:
- Pure HTML, CSS, and JavaScript
- No frontend framework
- No build step
- No runtime dependencies
- Static assets served through Cloudflare Workers
- Host-based routing for the primary site and co-op domain
- Canonical URLs and metadata for search indexing
- JSON-LD structured data for the hub and calculator pages
The Cloudflare Worker routes the available domains through one static asset bundle. The main hub lives at nyc-affordability.com, with each calculator available under a path on the primary domain:
I also have nyc-co-op-affordability.com for the co-op calculator. That domain routes visitors to the canonical co-op page while keeping the main site as the primary SEO target.
SEO Work
This project is also an experiment in practical SEO for useful tools. Instead of publishing a generic landing page, each calculator is built around a specific search intent inside the broader NYC apartment affordability and NYC home affordability space:
- Co-op buyers want to know whether cash reserves or board DTI rules are the limiting factor.
- Condo buyers want to understand how NYC closing costs and monthly carrying costs affect purchasing power.
- Renters want to translate annual income and available cash into a realistic monthly rent target.
Each page includes a targeted title, meta description, canonical URL, Open Graph metadata, Twitter metadata, and structured data. The content uses the same language people search for, including “NYC apartment affordability,” “NYC home affordability,” “NYC co-op affordability calculator,” “NYC condo affordability calculator,” and “NYC rent affordability calculator.”
What I Learned
The most interesting part of the project was modeling affordability around constraints instead of just displaying a monthly payment.
For co-ops, the limiting factor might be post-close reserves rather than the down payment. For condos, the limiting factor might be lender DTI once common charges and property taxes are included. For rentals, income screening and move-in cash can point to different answers. Building separate calculators made the logic easier to explain and easier to optimize for search.
Keeping the app static also turned out to be a good constraint. The calculators load quickly, work without user accounts, and avoid the operational overhead of a database or backend API.
Future
I would like to keep expanding NYC Affordability with more neighborhood-specific defaults, clearer explanations of each affordability constraint, and additional tools for comparing rent versus buy decisions in New York City.