Debt-to-Income Ratio Calculator (DTI)
Calculate your debt-to-income ratio for mortgage qualification.
See if you meet lender requirements and how to improve your DTI before applying for a loan.
What Is the Debt-to-Income Ratio? The debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward paying debts. Lenders use it to measure whether you can afford new debt payments. A high DTI signals that a large portion of your income is already committed to existing obligations, leaving less room for a new mortgage or car loan. It is one of the most important factors in mortgage qualification.
Two DTI Ratios: Front-End and Back-End Mortgage lenders calculate two separate DTI ratios. The front-end ratio (also called the housing ratio) includes only your housing payment — principal, interest, property taxes, homeowner’s insurance, and any HOA fees (collectively known as PITI). The back-end ratio (total DTI) includes all monthly debt obligations: housing, car payments, student loans, credit card minimums, personal loans, and any other recurring debt.
The Lender Thresholds For conventional mortgages (backed by Fannie Mae and Freddie Mac): front-end DTI below 28% is ideal, with a maximum back-end DTI of 43–45%. FHA loans (Federal Housing Administration): allows back-end DTI up to 50% with compensating factors such as a larger down payment or cash reserves. VA loans for veterans: no strict DTI limit but 41% is a common threshold. Jumbo loans above $766,550: often require DTI below 38%.
Why 43% Is the Key Number 43% back-end DTI became the “qualified mortgage” threshold under the 2010 Dodd-Frank Act. Loans exceeding this threshold carry extra regulatory requirements for lenders, which is why 43% is often used as a hard cutoff. This standard is intended to prevent lending to borrowers who are statistically more likely to default.
How to Improve Your DTI The most effective strategy is paying off small debts entirely — eliminating a $150/month car payment improves your DTI by 3 percentage points on a $5,000 income. Avoid taking on new debt (especially car loans) in the months before applying for a mortgage. If possible, increase gross income: a part-time job, rental income, or a raise all count. A co-borrower with income can also lower the combined DTI.
DTI Does Not Show the Full Picture DTI only counts minimum debt payments — not utilities, groceries, subscriptions, gas, or childcare. A borrower at 43% DTI with $800/month in daycare costs is in a very different financial position than one without childcare expenses. Lenders see DTI; they don’t see the full budget.