Debt-to-Income Ratio Calculator (Detailed)

Calculate front-end and back-end DTI with mortgage qualification thresholds.

By Konstantin Iakovlev · Updated April 2026 · Source: CFPB — Consumer Tools

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Use the Debt-to-Income Ratio Calculator (Detailed) above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Lenders lean heavily on one number when they size up a borrower: the share of gross monthly income already committed to debt payments. That figure, your debt-to-income ratio, signals how much room you have to take on and repay a new loan, and it shapes both approval decisions and the interest rate you are offered.

To produce it, the detailed version here adds together every recurring monthly debt payment you carry, such as credit card minimums, installment loan payments, and alimony, then divides that sum by your gross monthly income, meaning what you earn before taxes and deductions. Multiplying the quotient by 100 turns it into the percentage lenders work with.

Two slips throw the figure off. Folding in utilities, groceries, or other living expenses inflates the ratio, since only recurring debt counts; and using take-home pay instead of gross income understates your standing, because underwriters always start from pre-deduction earnings. Most conventional loans look for a DTI under 36%, while 43% tends to be the ceiling for mortgage qualification.

Example: Maria's Loan Application with $

  1. 1 Maria earns a gross monthly salary of $5,000. Her monthly debt payments include a $1,200 mortgage payment, a $300 car loan payment, and a $100 minimum credit card payment.
  2. 2 First, sum Maria's monthly debt payments: $1,200 (mortgage) + $300 (car loan) + $100 (credit card) = $1,600. Next, divide her total debt by her gross monthly income: $1,600 / $5,000 = 0.32. Finally, multiply by 100 to get the percentage: 0.32 * 100 = 32%.
  3. 3 Maria's Debt-to-Income Ratio is 32%.
  4. 4 A DTI of 32% is generally considered good by lenders. This indicates Maria has sufficient income to comfortably manage her existing debt obligations and would likely be viewed favorably for new loan applications, such as refinancing or another significant purchase.

Source: CFPB — Consumer Tools · Last updated: April 2026

Frequently Asked Questions

What DTI ratio do mortgage lenders require for approval?
For mortgage qualification, lenders prefer a front-end DTI (housing costs only) under 28% and a back-end DTI (all debt payments) under 36%. FHA loans allow up to 43%, and some lenders go to 50% with strong compensating factors. Below 20% is considered excellent.
What DTI ratio do mortgage lenders require for approval? (2)
Add up all monthly debt payments (mortgage/rent, car loans, student loans, credit card minimums, alimony) and divide by your gross monthly income. If your debts total $2,000/month and your gross income is $6,000/month, your DTI is 33%.
Does rent count in debt-to-income ratio for a mortgage?
If you are applying for a mortgage to buy a home, your current rent is replaced by the projected mortgage payment in the calculation. If you are keeping a rental property, that rent payment does count. The lender calculates DTI using the new housing payment, not your current rent.

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