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Rent Affordability Calculator — How Much Rent Can I Afford?

Find your maximum safe rent based on income using the 30% Rule, 40x Rule (NYC), or conservative 25% rule. See a pie chart of your budget split across rent, debts, and remaining cash.

✓ Formula verified: January 2026For informational purposes only
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Rent Affordability

Results update instantly as you type

Enter Values

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$
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Maximum Monthly Rent (30% Rule)
$1,875.00
↑ Gain
Monthly Gross Income$6,250.00
Rent as % of Gross Income30.0%
Remaining After Rent + Debts$4,025.00/mo
Annual Rent Cost$22,500

Meets 40x Landlord Requirement?

Yes — income qualifies

http://127.0.0.1:54963/finance/rent-affordability-calculator
Monthly Budget Breakdown

Income Allocation

$6.3Kper month
Rent
$1,875(30%)
Debts
$350(6%)
Remaining
$4,025(64%)

Max Rent by Rule

Conservative (25%)
$1,563/mo$4,338 left
Standard 30% Rule
$1,875/mo$4,025 left
40x Rule (~30%)
$1,875/mo$4,025 left
Aggressive (35%)
$2,188/mo$3,713 left

The Formula

30% Rule: Max Rent = Monthly Income × 0.30 · 40x Rule: Max Rent = Annual Income ÷ 40

The 30% rule calculates rent as a share of gross monthly income — a benchmark established by US housing policy in the 1960s. The 40x rule (popular in NYC and other major metros) requires annual income to be at least 40 times the monthly rent. Both rules arrive at roughly the same conclusion: housing costs should not consume more than about 30% of your income.

Variable Definitions

30% Rule

The Standard Rule

The most widely cited housing affordability benchmark. If you earn $5,000/month gross, you should spend no more than $1,500 on rent. It originated from US public housing policies in the 1960s, which capped rent at 25% for subsidized tenants, and later evolved into the 30% general personal finance guideline used by landlords and financial advisors alike.

40x Rule

The NYC/Metro Rule

Landlords in competitive rental markets often require annual income to be at least 40 times the monthly rent. For a $2,500/month apartment, you need $100,000/year in income. This is mathematically equivalent to approximately 30% of gross income but is framed differently to simplify landlord screening. It is the standard in cities like New York, San Francisco, and Boston.

25% Rule

Conservative Guideline

A stricter 25% rule used by financial planners who advocate for more savings and financial flexibility. This is especially valuable if you have high existing debt payments (student loans, car payments), irregular income, or are trying to save aggressively for a down payment on a home.

How to Use This Calculator

  1. 1

    Enter your gross income and select whether it is annual, monthly, or hourly.

  2. 2

    Add any existing monthly debt payments (car loans, student loans, minimum credit card payments).

  3. 3

    Select the affordability rule that best fits your market — 30% for most cities, 40x for NYC and major metros, or 25% for a conservative budget.

  4. 4

    The pie chart shows how your income breaks down across rent, debts, and remaining cash — making your true financial picture immediately visible.

Common Applications

  • Determine the maximum rent you can afford based on your income, existing debts, and the 30 percent or 40x affordability rule.
  • See how much cash you will have remaining each month after paying rent and other debt obligations to assess your true financial flexibility.
  • Compare different affordability rules to find the right balance between rent cost, lifestyle spending, and savings capacity.

The 30% rule (and equivalent 40x landlord rule) ensures you have enough income for other essentials and savings after paying rent

Understanding the Concept

Rent affordability is not just about the 30% rule — it is about what is left over after you pay rent and other obligations. If you have $500 in monthly student loans and a $1,500 rent on a $5,000 monthly income, you are working with $3,000 for food, transportation, savings, healthcare, utilities, and emergencies. The pie chart in this calculator makes this immediately visible. The "remaining cash" slice is what really determines your quality of life and financial flexibility. A low rent that still leaves you with little after other expenses is no better than rent that stretches the 30% guideline but still leaves room for savings.

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