Mortgage Debt-to-Income (DTI) Calculator
Estimate your front-end DTI and back-end DTI in seconds.
Tip: Use gross (pre-tax) monthly income. Include minimum debt payments only.
What is mortgage DTI?
Debt-to-income ratio (DTI) is one of the most important numbers in mortgage underwriting. It compares your monthly debt obligations to your gross monthly income. Lenders use DTI to decide whether your budget can comfortably support a new home loan payment.
In plain language: DTI helps answer, “After all required debt payments, do you have enough room for this mortgage?”
How this mortgage DTI calculator works
This page calculates two common ratios:
- Front-end DTI (housing ratio): Housing Payment ÷ Gross Income
- Back-end DTI (total ratio): (Housing Payment + Other Debts) ÷ Gross Income
Inputs you should include
- Monthly gross income: Income before taxes and deductions.
- Housing payment: Principal, interest, property tax, homeowners insurance, and HOA dues (if any).
- Other debts: Minimum monthly payments on credit cards, auto loans, student loans, personal loans, etc.
What is considered a good DTI for a mortgage?
Guidelines vary by lender and loan type, but common benchmarks are:
- Front-end DTI: Ideally at or below 28% (many programs allow higher).
- Back-end DTI: Around 36% is strong; up to 43% is common for many approvals.
- Above 43%: Approval can still be possible in some cases, but standards are usually tighter.
Remember: DTI is only one part of the decision. Lenders also evaluate credit score, employment history, down payment, reserves, and property details.
Quick example
Suppose you have:
- Gross income: $8,000/month
- Housing payment: $2,000/month
- Other debts: $600/month
Front-end DTI = 2,000 ÷ 8,000 = 25%
Back-end DTI = (2,000 + 600) ÷ 8,000 = 32.5%
That profile is usually viewed as fairly healthy, all else being equal.
How to lower your DTI before applying
1) Pay down revolving debt
Reducing credit card balances can lower your required minimum payments and improve your back-end DTI.
2) Avoid taking on new monthly obligations
A new car loan or financed purchase right before a mortgage application can materially hurt your approval odds.
3) Increase income documentation
If you consistently earn bonuses, commissions, or side income, ask your lender what documentation is required for that income to count.
4) Adjust your target home price
A smaller loan amount often means a lower monthly housing payment, improving both front-end and back-end DTI.
DTI is important, but it is not everything
Two borrowers with the same DTI can get very different outcomes. Why? Because lenders also consider:
- Credit profile and payment history
- Loan-to-value ratio (based on down payment)
- Cash reserves after closing
- Property type and occupancy (primary, second home, investment)
Frequently asked questions
Do utilities count in DTI?
Usually no. Standard DTI calculations focus on required debt obligations and housing costs, not variable utilities.
Should I use gross or net income?
Use gross income (before taxes). That is the standard approach for mortgage DTI.
Can I qualify with high DTI?
Possibly. Some loan programs allow higher DTI with compensating factors like strong credit, larger down payment, or significant cash reserves.
Bottom line
Use this mortgage DTI calculator as a fast pre-check before shopping for homes. If your ratios are close to lender limits, small changes in debt, income, or home price can make a major difference. Run multiple scenarios so you can choose a payment range that feels safe and sustainable.