Rent Affordability Calculator

Rent affordability calculator: find max rent by income using the 30% rule, debt, and rent-to-income ratio. Free, private, runs in your browser, no signup.

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Every figure above is calculated locally in your browser from the assumptions shown. No inputs are sent anywhere. See the methodology section below for how this tool works.
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Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.

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What does this calculator estimate?

Use this rent affordability calculator to estimate a suggested maximum monthly rent from annual income, your chosen income cap, monthly debt, and monthly savings. It converts income to a monthly figure, applies the cap, then compares it with cash remaining after debt and savings. The lower amount is shown.

Rent cap comparison of 30 percent income rule versus leftover cash method
Rule cap $1,500 beat the $1,000 leftover cash ceiling.
Transparent methodology

How this calculator works

Formula

The suggested rent is the lower of the income-based cap and gross monthly income minus entered debt payments and the savings goal.

Worked example

At $75,000 annual gross income and a 30% cap, the income-rule ceiling is $1,875 per month before considering debts, savings, utilities, and other housing costs.

Sources

Assumptions to verify

  • Income is gross annual income before taxes.
  • Utilities, deposits, insurance, parking, and moving costs are not included.
  • Landlord qualification standards vary and may use different income multiples.

Frequently asked questions

How much rent can I afford?

This calculator suggests the lower of your income-based rent cap and the monthly cash left after debt and savings.

What is the 30% rule for rent?

The 30% rule sets rent at 30% of gross monthly income. This calculator also checks whether debt and savings leave enough cash.

Does debt affect affordable rent?

Yes. Monthly debt and savings are subtracted from gross monthly income. If that amount is lower than your rent cap, it becomes the suggested maximum.

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Cite this tool

BoringToolsKit. “Rent Affordability Calculator.” boringtoolskit.com/rent-affordability-calculator/. Free to reference in articles, syllabi, and answer posts with a link.

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Worked example: how the two caps interact

Take a renter earning $60,000 per year with a 30% cap. The calculator divides $60,000 by 12 to get $5,000 gross monthly income, then multiplies by 30% for a rule cap of $1,500. If they carry $600 in monthly debt payments and want to save $500 per month, the cash method gives $5,000 minus $600 minus $500, or $3,900. The suggested maximum rent is the lower of $1,500 and $3,900, which is $1,500. Here the income rule is the binding constraint, so the debt and savings inputs do not change the answer at all.

Now change the situation to a $36,000 income at a 35% cap with $1,600 in debt payments and $400 in savings. The rule cap is $3,000 times 0.35, or $1,050, but the cash method gives $3,000 minus $1,600 minus $400, which is only $1,000. The suggested maximum rent becomes $1,000, because a person cannot pay a rent their leftover income does not cover. When the cash figure falls below the rule cap, your debt and savings choices are what actually set your ceiling, not the percentage rule.

This is also why the tool floors the cash figure at zero: with $3,000 in debt on a $3,000 gross income, negative leftover cash would otherwise drag the suggestion below $0, which is not a meaningful rent.

Edge cases the percentage rule misses

The rule cap scales with gross income but pays no attention to the paycheck you actually receive. A $5,000 gross income is roughly $3,900 take-home after federal tax, FICA, and typical state withholding, so a 30% rule cap of $1,500 is really about 38% of net pay. In high-tax states the same gross can leave $300 or more per month less in hand, which is why the debt-and-savings inputs matter even for renters with no loans.

Local rent dynamics can also force overrides. In Manhattan, the median asking rent has run well over $4,000 per month, meaning a renter earning the $5,000 gross from the example faces a market where the 30% cap rules out most of the inventory. Roughly 65% of renter households nationwide are cost-burdened (paying more than 30% of income) precisely because local prices, not personal math, set the floor.

Finally, the calculator is a monthly snapshot. It treats a $600 car loan identically whether it has 6 months or 60 months left, ignores one-time moving costs (security deposit plus first and last month commonly equals three months of rent, or $4,500 on a $1,500 apartment), and assumes utility costs of $0. Treat the suggested maximum as a starting bid for your search, not a verdict on a specific lease.