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Rent Affordability Calculator

Find out how much rent you can afford on your income and debts, using the 30% guideline and a debt-to-income cap, and whether you'd pass a landlord's 3× income test.

Level: Grades 6–7

  • Common Core standard 6.RP.A.3.cFind a percent of a quantity as a rate per 100 (e.g., 30% of a quantity means 30/100 times the quantity); solve problems involving finding the whole, given a part and the percent.
  • Common Core standard 7.RP.A.3Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.
Printable worksheet

Rent Affordability Calculator

Know the answer you need? Pick an input to work backward.

Inputs

Combine incomes if you are renting with a partner or roommates.

Income is per

Minimum payments on car loans, student loans, credit cards and other debts.

Rent plus all other debt payments as a share of gross income.

Only costs not already included in the rent.

Result

Rent you can afford

$1,700.00 / month

On $6,250.00 a month before tax, a rent of up to about $1,700.00 a month keeps housing within 30% of income and total debts within 36%. The limit is set by your other debt payments.

Yearly rent at that level
$20,400.00
Housing budget at 30% of income
$1,875.00
Housing room under the debt limit
$1,850.00
Highest rent under a 3× income test
$2,083.33
Yearly income a 40× landlord test needs for this rent
$68,000.00
Left each month after rent, utilities and debts (before tax)
$4,000.00
Where gross monthly income goes
  • Rent$1,700.0027.2%
  • Utilities and insurance$150.002.4%
  • Debt payments$400.006.4%
  • Everything else (taxes, food, savings)$4,000.0064%

See the step-by-step solution ↓

Step-by-step solution

  1. Divide your yearly income by 12, because rent is paid monthly

    $75,000.0012=$6,250.00

  2. Find the housing guideline budget: 30% of your monthly income

    $6,250.00×30%=$1,875.00

  3. Find the debt-limit budget: 36% of your income, minus the debt payments you already make

    $6,250.00×36%−$400.00=$1,850.00

  4. Use the lower of the two so you stay within both. Here the limit is set by your other debt payments

    housing budget=$1,850.00

  5. Take away utilities and insurance that aren't part of the rent, since they come out of the same budget

    $1,850.00−$150.00=$1,700.00

  6. Landlord check: many want your monthly income to be at least 3 times the rent, so divide it by 3

    $6,250.003=$2,083.33

Test yourself

20 quick questions built from this calculator's formula: work out results, predict what happens when an input changes, and work backward from an answer. Every answer comes with the working.

Please note: Results are estimates for planning and comparison. Lenders, banks, and tax authorities may round differently or include fees not modeled here, so confirm figures with your provider before deciding.

What this calculator does

Find out how much rent you can comfortably afford before you start touring apartments. Rent is the biggest monthly bill for most renters. The most common guideline is to spend no more than about 30% of your gross (before-tax) income on housing. That works well when you have few other debts. But car payments, student loans and credit cards also compete for the same paycheck.

This calculator checks both. First it finds the rent that keeps housing within your chosen share of income. Then it finds the rent that keeps rent plus all your debt payments within a total limit, called a debt-to-income cap. It takes the lower of the two. It also sets aside utilities and renter's insurance that aren't part of the rent. Finally, it shows the 3× income test many landlords use to screen applicants, so you can see whether you're likely to qualify.

Where it's used

Why this math matters outside the classroom:

  • The 30% guideline. A gross income of $4,500 a month puts 30% of it, $1,350, toward rent.
  • Landlord income tests. A landlord asking for income of 3 times the rent would expect $4,500 a month for a $1,500 apartment.
  • Including other debts. Renters with a $400 car payment and a 36% cap on $4,500 of income have $1,220 left for rent.
  • Roommate planning. Two roommates each apply the 30% guideline to their own income to see what total rent they can share.

Grade level and standards: Grades 6–7; Common Core State Standards for Mathematics 6.RP.A.3.c, 7.RP.A.3. © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.

How to use it

  1. Enter your gross income before tax, and say whether it's yearly or monthly. If you're renting with others, add together the incomes of everyone on the lease.
  2. Enter the minimum monthly payments on all your debts, such as car, student and personal loans and credit cards.
  3. Keep the 30% housing share and the 36% debt limit, or change them to match your own comfort level.
  4. Enter your usual monthly utilities and renter's insurance that the landlord doesn't include. Then read the rent you can afford and the landlord check.

What the inputs mean

Gross income (before tax)
Use gross income, before taxes and deductions, because that's what the guidelines and most landlords use. If your income goes up and down, a careful average of recent months works better than your best month.
Monthly debt payments
Required monthly payments only. Don't include rent, utilities, groceries or other living costs here.
Share of income for housing
30% is the long-standing rule of thumb. Choose less if you're saving hard or live in a lower-cost area. Choose more if you have no debts and are OK with a tighter budget.
Maximum total debt-to-income
The share of gross income that rent and all debt payments together shouldn't go over. 36% is a common, cautious benchmark. Some landlords and lenders allow higher.
Utilities and renter's insurance
Electricity, gas, water, internet and renter's insurance that you pay separately. Ask the landlord or past tenants what the bills usually are.

Formula and method

monthly income = yearly income ÷ 12
guideline budget = monthly income × housing share
debt budget = monthly income × debt-to-income cap − monthly debt payments
affordable rent = min(guideline budget, debt budget) − utilities
3× test: highest rent = monthly income ÷ 3
40× test: yearly income needed = 40 × monthly rent

The housing share and the debt-to-income cap are percents of your gross monthly income. min(…) means "whichever is smaller". Both budgets cover your total housing costs. So utilities and insurance you pay separately come out before the rent itself.

Whichever budget is lower sets your limit. If you have sizable debt payments, the debt budget is usually the one that sets it.

Landlord income tests are screening rules, not budgets. The 3× test asks for gross monthly income of at least three times the rent. The 40× test asks for yearly income of at least 40 times the monthly rent, which is a little stricter. Passing them only means you're likely to be approved. The guideline budget is a better sign of whether the rent will feel comfortable.

Worked example

You earn $75,000 a year, pay $400 a month toward a car loan and student loans, and expect $150 a month in utilities and renter's insurance.

  1. Monthly income: $75,000 ÷ 12 = $6,250.
  2. 30% guideline: $6,250 × 30% = $1,875.
  3. Debt limit: $6,250 × 36% − $400 = $1,850, which is lower, so your debts set the limit.
  4. Affordable rent: $1,850 − $150 = $1,700 a month, or $20,400 a year.
  5. Landlord check: $6,250 ÷ 3 ≈ $2,083.33, so a $1,700 rent passes easily. A 40× test needs $68,000 of yearly income.

Result: You can afford a rent of about $1,700 a month.

Understanding the result

Treat the result as a ceiling, not a target. Renting below it leaves room for savings, emergencies and the costs of moving. Those include a deposit, application fees and the first month's rent.

If the debt budget is the one setting your limit, paying down a debt can raise your affordable rent more than a pay raise would. If the landlord test allows a much higher rent than the guideline, remember that getting approved isn't the same as being able to afford it.

Assumptions and limitations

  • Your gross income stays steady from month to month.
  • Utilities and insurance are one fixed monthly estimate.
  • The guideline and debt percentages are rules of thumb you can change. They aren't legal or lender requirements.
  • Taxes, take-home pay, local living costs and savings goals vary widely. A budget based on your take-home pay gives a more personal picture.
  • Landlords may also look at your credit history, rental history and savings. Some use different income multiples.
  • This is an estimate for planning, not financial advice.

Frequently asked questions

What is the 30% rule for rent?

It suggests spending no more than about 30% of your gross monthly income on housing. On $5,000 a month, that's $1,500. It's a handy starting point. With heavy debts or big savings goals, you may want to aim lower.

What does 3× the rent mean?

Many landlords require your gross monthly income to be at least three times the monthly rent. For a $1,500 apartment, that means earning at least $4,500 a month, or $54,000 a year. Some use 2.5×, or accept a guarantor (someone who promises to pay if you can't) when you fall short.

What is the 40× rent rule?

Some landlords, especially in expensive cities, require yearly income of at least 40 times the monthly rent. For $2,000 a month, that's $80,000 a year. It's slightly stricter than the 3× test, because 40 ÷ 12 is about 3.33.

Should I use gross or take-home pay?

The 30% rule and landlord tests use gross pay, so this calculator does too. Your take-home pay is lower after taxes and deductions. So check that the rent also fits your real monthly budget.

How do roommates change the math?

Landlords usually add together the incomes of everyone on the lease. Enter the combined income and combined debt payments to see the total rent your household can afford. Then split it however you agree.

How this calculator is checked

Method: Common housing affordability rules of thumb: housing ≤ a share of gross income (30% default) and housing plus debts ≤ a debt-to-income cap (36% default); landlord 3× monthly and 40× yearly income tests. The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-18. Found a problem? Tell us.

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