Debt-to-Income Ratio Calculator

Calculate front-end and back-end debt-to-income ratios from gross income and monthly debts, and compare them with typical conventional, FHA, VA and USDA limits.

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About this tool

What is the Debt-to-Income Ratio Calculator?

The Debt-to-Income Ratio Calculator measures how much of your gross income goes to debt payments, the figure lenders check before approving a mortgage, car loan or personal loan. Enter income (annual or monthly), your rent or proposed mortgage payment, and each type of monthly debt, and it returns the front-end ratio (housing only) and the back-end ratio (all debts).

Your result is placed on a scale and checked against typical limits for the 28/36 guideline, conventional loans, FHA, VA and USDA. It also shows how much more monthly debt you could take on before reaching 36%, a common comfort line.

The limits shown are typical published figures, not approvals. Lenders apply their own overlays, and automated underwriting can go higher or lower depending on credit score, savings and the loan itself.

  • Front-end and back-end ratios
  • Annual or monthly income entry with other income
  • Six debt categories plus housing
  • Comparison with 28/36, conventional, FHA, VA and USDA limits
  • Room before 36% and a colour-coded scale
Read the guide: Car Loans, Leases and Paying Off Debt: The Numbers That Matter

How to use the Debt-to-Income Ratio Calculator

  1. Choose annual or monthly and enter gross income, plus any other regular income you can document.
  2. Enter your monthly housing payment. For a mortgage application use the new payment including tax, insurance, PMI and HOA.
  3. Enter the monthly payment on each debt: car, student loans, card minimums, personal loans, support you pay and anything else.
  4. Read the back-end ratio, the front-end ratio and where you sit on the scale.
  5. Check the lender limits table and the room under 36% before applying.

Worked examples

The default household

Input

Income 90,000 a year; housing 1,900; car 420; student loans 250; card minimums 120

Output

Front-end 25.3%; back-end 35.9%

Monthly income is 7,500 and total debts are 2,690. The household is under 36% overall and passes every guideline in the table; it has about 10 a month of room before crossing 36%.

Adding a 400 car payment

Input

Same household, car payment 820

Output

Back-end 41.2%

One new loan moves the ratio from comfortable to the range where conventional manual underwriting would need compensating factors, and just over the VA and USDA guidelines.

Background and insight

DTI is a simple ratio: monthly debt payments divided by gross monthly income, before tax. The front-end or housing ratio counts only the housing payment: principal, interest, property tax, homeowners insurance, mortgage insurance and HOA dues. The back-end ratio adds every other recurring debt obligation that appears on a credit report or a court order, such as car loans and leases, student loans, credit card minimums, personal loans, and child support or alimony.

Typical limits differ by program. Fannie Mae's Selling Guide (B3-6-02) caps manually underwritten conventional loans at 36%, or 45% with strong credit and reserves, and allows up to 50% through Desktop Underwriter. HUD's Handbook 4000.1 uses 31% front-end and 43% back-end for manually underwritten FHA loans. VA uses a 41% guideline alongside a residual income test, and USDA guaranteed loans use 29% and 41%. The 43% figure often quoted comes from the original Qualified Mortgage rule; the CFPB replaced that hard cap with a price-based test in a rule finalized in December 2020.

Expenses that are not debts, such as utilities, phone bills, groceries, insurance premiums and transport costs, are left out of DTI. That is why a ratio a lender accepts can still leave a tight budget.

Common use cases

  • Before applying for a mortgage

    See whether your ratios are inside typical limits for the loan program you plan to use.

  • Before taking on a car loan

    Check how a new payment would affect a mortgage application later in the year.

  • Choosing which debt to pay off

    Find the payoff that drops your back-end ratio below a threshold fastest.

  • Personal budgeting

    Track your debt load over time as a single number.

Tips and limitations

  • Use gross income, not take-home pay. Lenders use pre-tax income to calculate DTI.
  • Enter the minimum payment on each card, even if you pay in full each month; lenders usually count the reported minimum.
  • A debt with fewer than ten payments left is sometimes excluded on conventional loans; ask your lender.
  • Variable income such as bonuses or self-employment usually needs a two-year history before lenders count it.
  • These thresholds are typical, not guarantees; check current guidelines with a lender.

Frequently asked questions

What is a good debt-to-income ratio?

Under 36% for all debts is widely treated as comfortable, with no more than 28% going to housing. Many lenders approve up to 43% or more with good credit and savings, and some automated approvals reach 50%. Lower is better for both approval odds and your monthly budget.

How do you calculate debt-to-income ratio?

Add up your monthly debt payments, divide by gross monthly income and multiply by 100. With 2,690 of payments and 7,500 of monthly income, DTI is 2,690 ÷ 7,500 = 35.9%. The front-end ratio uses only the housing payment.

What is the difference between front-end and back-end DTI?

Front-end DTI counts only housing costs: mortgage or rent, property tax, insurance, mortgage insurance and HOA dues. Back-end DTI adds all other monthly debts. Lenders look at both, but the back-end ratio is usually the one that decides approval.

What DTI do you need for an FHA loan?

HUD's guideline for manually underwritten FHA loans is 31% front-end and 43% back-end, with higher ratios allowed when there are compensating factors. Loans approved through FHA's automated scorecard can go above that. Check with an FHA-approved lender for your case.

Does rent count in debt-to-income ratio?

For a mortgage application, lenders replace your rent with the proposed new housing payment. For other loans, rent may or may not be counted. Enter rent if you want to see your current position, or the expected mortgage payment if you are preparing to buy.

Are utilities and insurance included in DTI?

No. Utilities, phone, groceries, car insurance and health insurance premiums are living expenses, not debts. Homeowners insurance is the exception because it is part of the housing payment.

Is there an in-depth guide to the Debt-to-Income Ratio Calculator?

Yes. “Car Loans, Leases and Paying Off Debt: The Numbers That Matter” covers the background, how it works, common pitfalls and worked examples. Read the full guide.

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