Rent Affordability Calculator

How to use

1. 1Enter your gross annual income (before tax). Use combined income if you and a partner or roommate will share rent.
2. 2Enter your take-home monthly pay (after tax and pre-tax deductions). Use the Estimate from gross button to start fast, then replace it with your paystub net.
3. 3Add other monthly debt payments (car, student, minimum credit card) and other monthly needs (utilities, transport, groceries, insurance, phone).
4. 4Open the cap settings if you want to change the rent-to-income percent, the landlord income multiplier (40x, 45x, 50x), or the housing share of your 50/30/20 needs budget.
5. 5Read the maximum rent, the binding cap, and the rent allowed by each rule. Use the scenarios table to compare a slightly cheaper or stretchier rent, and Copy summary to save the breakdown.

About this tool

Rent Affordability Calculator answers the question every renter searches first: 'how much rent can I afford?' It applies the four rules of thumb that real renters and real landlords actually use, then reports the tightest of the four as your maximum monthly rent. Rule one is the classic 30 percent rent-to-income cap (gross monthly income times 30 percent), the threshold above which the US HUD considers a renter cost burdened. Rule two is the landlord income multiplier (annual income must be at least 40 times the monthly rent in New York and most large US markets; some luxury buildings require 45x or 50x). Rule three is the 50/30/20 budget framework: total NEEDS at most 50 percent of take-home pay, with housing taking a configurable share of that needs budget after other recurring needs (utilities, transport, groceries, insurance) are deducted. Rule four is a lender-style 36 percent back-end DTI applied to rent plus other monthly debts (car loan, student loan, minimum credit card payment), which keeps borderline high-debt cases from looking artificially affordable. Every cap is user-editable, so the tool works whether you live in a HUD-conservative market, a high-cost city that quotes 40x or 45x, or a budget-tight market where 25 percent is the realistic ceiling. The result panel shows the maximum monthly rent, the binding cap (which rule actually limits you, and a one-line explanation of what would unlock more rent), and the rent allowed by each of the four caps individually so you can see exactly which one is hurting. A side-by-side scenarios table runs your computed cap at minus 30 percent through plus 20 percent so you can see how the budget shifts if you rent below your ceiling or stretch above it, classified using HUD's cost-burden thresholds (30 percent stretched, 35 percent cost burdened, 50 percent severely cost burdened). Six preset scenarios cover single renters, early-career, couples splitting rent, high-cost cities, luxury 50x buildings, and tight budgets with heavy debt. An Estimate from gross button fills your take-home monthly from a flat 25 to 32 percent tax bracket so you can start fast and then replace it with your actual paystub. Currency formatting supports USD, EUR, GBP, CAD, AUD, INR, and TRY for display only; no exchange rates are fetched. Useful for setting a realistic apartment-search budget, deciding whether to take a roommate, negotiating with a guarantor, comparing what your friend's landlord requires versus what your own budget allows, and sanity-checking a lease offer before you sign. Math runs entirely in your browser, so income, debts, and budget data stay on your device.

Free to use. Works in your browser. No signup, no login.