Rent to Income Ratio Calculator: 30%, 40× and 3× Rules
Enter a rent and your income to see your rent-to-income ratio, the share of take-home pay it takes, and whether it passes the 30% rule and the landlord 40× and 3× rules
By the Monthly Income Booster editorial team · Updated · How we research and fact-check
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Rent to Income Ratio Calculator: 30%, 40× and 3× Rules
Printed 2026-10-27 from billorganizingapp.com/income/calculators/rent-affordability/ — an estimate for planning, not financial or tax advice.
HUD treats households paying more than 30% of income for housing as cost-burdened. Many landlords ask for yearly income of 40× the monthly rent (some use 3× monthly income, which is 36×). The half-of-take-home check leaves room for every other need in a 50/30/20 budget. Take-home is estimated for a single filer with 2026 federal tax; rent here excludes utilities, so budget those separately.
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Your rent-to-income ratio is your monthly rent divided by your gross monthly income. $1,500 rent on a $52,000 salary ($4,333 a month) is a ratio of 34.6%. Landlords and housing agencies use the ratio to decide whether rent is affordable: HUD's line is 30%, and the landlord rules of 40× yearly income or 3× monthly income set the same bar from the other side. The calculator works out your ratio, the share of take-home pay the rent takes, and whether you pass each rule.
Rent is the biggest bill most households have, and the easiest to get wrong because the lease is signed once and paid every month. There are three quick checks, and they answer different questions: whether housing will crowd out everything else (the 30% rule), whether a landlord will approve you (the 40× rule), and whether the rest of your budget still works on what you actually bring home. The calculator runs all three and suggests the lowest as a comfortable ceiling.
The three checks at common incomes
The 30% rule comes from housing policy: the U.S. Department of Housing and Urban Development treats households paying more than 30% of income for housing as cost-burdened. The 40× rule is a screening practice many landlords use — yearly income of at least 40 times the monthly rent — which works out to 30% of gross income, the same line from the other side. The take-home check leaves room for every other need.
| Salary | 30% of gross | 40× rule | Half of take-home |
|---|---|---|---|
| $30,000 | $750 | $750 | $1,095 |
| $40,000 | $1,000 | $1,000 | $1,430 |
| $50,000 | $1,250 | $1,250 | $1,765 |
| $60,000 | $1,500 | $1,500 | $2,100 |
| $75,000 | $1,875 | $1,875 | $2,566 |
| $100,000 | $2,500 | $2,500 | $3,299 |
Why take-home pay changes the answer
The 30% rule is quoted on gross pay, but rent is paid from take-home pay. On a $50,000 salary, 30% of gross is $1,250 a month — about 35% of what a single filer with no state tax actually receives each month. State income tax, a 401(k) contribution and health premiums push that share higher. That is why the calculator also caps rent at half of take-home pay minus your monthly debt payments: in a 50/30/20 budget, half of take-home has to cover every need, and rent is only one of them.
Costs that sit on top of rent
Utilities, renter's insurance, parking, pet rent and fees for amenities are usually outside the rent figure, and they can add a meaningful share on top. A lower rent with utilities included can cost less overall than a cheaper-looking listing that bills them separately. Moving costs — deposit, first month, application fees and the move itself — are a one-time amount to have saved before signing.
If you do not meet the landlord's income rule
A co-signer or guarantor, a larger deposit where the law allows it, a roommate's income on the application, or proof of savings can all help. Some cities cap deposits or limit how income can be counted, so check local rules. Rather than stretching to a rent that fails every check, the calculator's take-home line shows what fits now — and the pay and side-income tools on this site show what it would take to move the line.
You may also find this useful: How Much Do Transcriptionists Make?.
Weighing a purchase instead? The rent vs buy calculator on our sister site Simple Mortgage Planning compares the two year by year, and its how much house can I afford calculator applies the same income-ratio test to a mortgage.
Official sources
Tax rules, limits and pay data change. Check the current figures with the primary source before acting on them.
Frequently Asked Questions
What is a good rent to income ratio?+
30% or less of gross monthly income. That's HUD's cost-burden line and roughly what the landlord 40× rule requires. Under 25% leaves more room for savings and debt payments.
How do I calculate rent to income ratio?+
Divide the monthly rent by your gross monthly income and multiply by 100. $1,500 rent on $4,333 a month ($52,000 a year) is 34.6%.
How much rent can I afford on $50,000 a year?+
About $1,250 a month under the 30% rule and the 40× landlord rule. For a single filer with no state tax, $1,250 is about 35% of what arrives each month in 2026, so less is more comfortable if you have debt payments.
What is the 40× rent rule?+
Many landlords require yearly gross income of at least 40 times the monthly rent. For a $1,500 rent that is $60,000 a year.
How much rent can I afford on $3,500 a month?+
$1,050 a month is 30% of $3,500 gross. If $3,500 is your take-home pay, half of it is $1,750 for all needs, so rent near $1,050 still leaves room for utilities, food and transport.
Is 30% of income for rent too much?+
It is the line HUD uses to define a cost burden, so spending more is common in expensive cities but squeezes savings. Spending less leaves more room for everything else.
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