Debt-to-Income Ratio Calculator

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Formula
DTI = (Total Monthly Debt Payments / Gross Monthly Income) × 100

Total monthly debt payments include all recurring debt obligations: rent or mortgage, car loans, student loans, minimum credit card payments, and any other installment or revolving debts. Gross monthly income is your income before taxes and deductions. Lenders use this ratio to assess the risk of lending you more money.

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TL;DR

Enter your gross monthly income and each monthly debt payment. The calculator shows your DTI percentage and how it compares to lender thresholds for loan approval.

Enter your gross monthly income and your monthly debt payments: housing, car, student loans, credit cards, and anything else you owe each month. The result is your DTI percentage and a plain-language assessment of how lenders are likely to view it.

Lenders use a single number to quickly assess whether you can handle more debt. That number is your debt-to-income ratio, or DTI. It is the percentage of your gross monthly income that goes toward debt payments. A ratio below 36% is generally considered healthy. Most conventional mortgage lenders cap approval at 43% to 45% DTI. Above 50%, it becomes very difficult to qualify for new credit. Knowing your DTI before applying for a loan tells you where you stand and what you may need to pay down or pay off to qualify.

A familiar scenario

Walking through an example

Example: $5,000/month income with $1,750 in monthly debt payments

  1. 1Gross monthly income = $5,000
  2. 2Rent = $1,200
  3. 3Car payment = $300
  4. 4Student loan = $200
  5. 5Credit card minimum = $50
  6. 6Total monthly debt = $1,200 + $300 + $200 + $50 = $1,750
  7. 7DTI = ($1,750 / $5,000) × 100 = 35.0%
Result: DTI of 35.0%: Good. This borrower should qualify for most conventional loans.

When this comes up

Where you would actually use this

  • Checking mortgage eligibility: Most conventional mortgage lenders require a back-end DTI at or below 43% and prefer under 36%. Enter your current debts plus the expected new mortgage payment to see whether you will likely qualify.
  • Preparing to apply for a car loan: Before you shop for a car, enter your current debts and estimated car payment to see what your post-purchase DTI would be. If it comes out above 43%, a larger down payment or less expensive vehicle brings it back into range.
  • Identifying which debts to pay off first: If your DTI is above 43%, list your debts by monthly payment size. Paying off one debt completely reduces the numerator more than making extra principal payments on multiple debts. Target the debt with the highest monthly payment that you can eliminate fastest.
  • Tracking financial health over time: Run this calculation every few months as you pay down debt or your income changes. A declining DTI ratio shows clear progress toward financial flexibility and improved borrowing capacity.

Where it trips people up

Things people get wrong

  • Using net income instead of gross: DTI is always computed on gross (pre-tax) income. Using your take-home pay produces a higher, inaccurate DTI. Use the gross income from your pay stub or tax return.
  • Forgetting minimum credit card payments: Even if you pay your credit cards in full each month, lenders include the minimum payment in the DTI calculation because that is the required monthly obligation. Make sure to include all card minimums, not just balances you carry.
  • Including expenses that are not debt: Groceries, utilities, phone bills, and subscriptions are not debt payments and should not be included in DTI. Only include obligations that appear on your credit report or are contractual loan/lease payments.
  • Applying for a loan before reducing DTI: If your DTI is borderline, a hard inquiry and a new debt adds to the problem. If possible, pay down or pay off a debt first to lower your DTI, then apply. The difference of one or two percentage points can mean the difference between approval and denial.

The math

The formula, formally

  1. 1Enter your gross monthly income: your pay before taxes and deductions.
  2. 2Enter each monthly debt payment separately: rent or mortgage, car loans, student loans, credit card minimums, and other recurring debt.
  3. 3The calculator adds all debt payments to get total monthly debt.
  4. 4It divides total monthly debt by gross monthly income and multiplies by 100 to get the DTI percentage.
  5. 5Your DTI is then classified against standard lender thresholds: under 36% (good), 36 to 43% (acceptable), above 43% (high).

Terms to know

Glossary

TermDefinition
Front-end DTIHousing costs divided by gross monthly income. Includes mortgage or rent, property tax, homeowner's insurance, and HOA fees. Conventional mortgage lenders typically want this below 28 to 31%.
Back-end DTIAll monthly debt payments divided by gross monthly income. This is the figure this calculator computes. It is the more commonly used DTI in lending decisions. Conventional mortgage lenders typically cap this at 43 to 45%.
Qualified Mortgage (QM)A mortgage that meets specific requirements set by the Consumer Financial Protection Bureau, including a back-end DTI limit of 43%. Lenders who issue QM loans receive legal protection from borrower lawsuits. Most conforming mortgages are QMs.
Gross income vs. net incomeDTI is always calculated on gross income (before taxes). Lenders use gross because it is verifiable from pay stubs and tax returns, and because tax situations vary widely between borrowers. Your take-home pay (net income) is always less than the gross figure used in DTI.

Expert advice

Pro tips

  • Pay off small debts to quickly lower DTI: A $100/month car loan paid off reduces your DTI by 2 percentage points on a $5,000/month income. Eliminating a payment completely is more effective for DTI than making extra payments on a large loan like a mortgage.
  • Increase income to improve DTI without paying down debt: A raise, a part-time job, or documented freelance income increases the denominator and lowers your DTI. Some lenders accept 24 months of self-employment income if documented. More income is a valid path to DTI improvement.
  • Do not open new credit before a major loan application: New credit cards and loans increase your minimum monthly obligations and can raise your DTI. Avoid new accounts for at least 6 months before applying for a mortgage or major loan.
  • Ask lenders about exceptions: Some loan programs allow DTI above 43% with compensating factors: large down payment, significant cash reserves, high credit score, or stable long-term employment. Ask what compensating factors apply before assuming a high DTI disqualifies you.

Common questions

Frequently asked questions

For related calculations, try the Loan Calculator, Mortgage Calculator, or Net Worth Calculator. Browse all Calculator Online calculators for the full catalog.

Methodology

This calculator uses the standard debt-to-income calculator formula. Results match those from established financial, scientific, and health references.

Reviewed by

Calculator Online Editorial Team. All formulas verified against authoritative sources before publication.

Last updated

2026-05-24

Sources & References