Lenders use your DTI ratio to decide if you qualify for a mortgage, car loan, or personal loan. This calculator gives you the exact percentage and tells you whether banks will see you as Excellent, Good, Warning, or High Risk 鈥?plus what to do next.
How DTI Is Calculated
The formula is simple:
DTI = (Total Monthly Debt Payments 梅 Monthly Gross Income) 脳 100
Banks use two flavors:
- Front-end DTI 鈥?only housing costs (mortgage, property tax, insurance, HOA) divided by income. Lenders typically want this under 28%.
- Back-end DTI 鈥?all debt payments including housing. This is what most articles mean by "DTI." Most lenders want this under 36%, with 43% being the hard cap for Qualified Mortgages in the U.S.
This calculator computes back-end DTI, which is the more comprehensive picture lenders care about.
Advertisement
Frequently Asked Questions
What DTI do I need to qualify for a mortgage?
Most conventional lenders want your back-end DTI below 36%, though some go up to 45% for borrowers with strong credit. FHA loans can stretch to 50% in special cases. Below 28% gives you the strongest negotiating position on rates.
Do I use gross or net income?
Always gross (pre-tax) income 鈥?that's what every U.S., U.K., and Australian lender uses. Using net income gives you an artificially high DTI and can scare you out of loans you actually qualify for.
Do utilities and groceries count?
No. DTI counts only "debt obligations" 鈥?fixed payments to creditors. So include mortgage/rent, car loan, student loans, minimum credit card payments, personal loans, alimony, and child support. Exclude utilities, food, gas, insurance premiums, and discretionary spending.
How quickly can I improve my DTI?
Two levers: increase income or decrease debt. The fastest fix is paying off a small debt entirely (e.g., a credit card with a $150 minimum payment) 鈥?that single move drops your DTI immediately. Refinancing high-rate loans into longer terms also helps short-term but costs more long-term.
Does my DTI affect my credit score?
Not directly 鈥?DTI is not part of your FICO score. But high DTI usually correlates with high credit utilization, which does hurt your score. Lenders pull DTI separately when reviewing a loan application.