Debt-to-Income Calculator
Front-end and back-end DTI ratio check for mortgage and loan qualification
Know your DTI before you apply
DTI is one of the first things every lender checks. Calculate yours in seconds so there are no surprises when you apply.
Front & back-end DTI
Calculates both ratios — housing costs only (front-end) and all debts combined (back-end).
Lender thresholds
Compares your DTI against the standard 28/36 guidelines lenders actually use.
Visual bar chart
Color-coded bars show at a glance whether your DTI is in the green, amber, or red zone.
Mortgage readiness
See if you are ready to apply for a mortgage based on your current debt load and income.
Debt reduction target
Understand exactly how much debt to pay down to get below a key DTI threshold.
100% private
All calculations run in your browser. Your financial data is never stored or shared.
When to use it
Before applying
Check your DTI before a mortgage application to avoid a hard pull with a doomed-to-fail ratio.
Debt payoff priority
Identify which debts to eliminate first to get below lender thresholds.
New loan impact
See how adding a car payment would affect your DTI before the purchase.
Annual check
Track DTI improvement as you pay down debt and grow income over time.
Frequently Asked Questions
What is DTI and why does it matter?
Debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward debt payments. Lenders use it as a primary measure of your ability to take on and repay new debt. A low DTI indicates financial health and makes you more likely to qualify for favorable loan terms; a high DTI suggests you may struggle to service additional debt.
What is the difference between front-end and back-end DTI?
Front-end DTI (also called the housing ratio) includes only your proposed housing costs — mortgage principal and interest, property taxes, homeowner's insurance, and HOA fees — as a percentage of income. Back-end DTI includes all monthly debt payments: housing plus car loans, student loans, credit cards, and other installment debts. Lenders care most about the back-end ratio.
What DTI do I need to qualify for a mortgage?
Conventional loans typically want a back-end DTI at or below 36%, though many lenders will go to 43–45% with strong compensating factors like a large down payment or high credit score. FHA loans allow up to 50% DTI in some cases. Front-end DTI is ideally below 28%. Lower is always better — it improves your terms and gives you a cushion if income drops.
How do I lower my DTI?
Two levers: increase income or pay down debt. On the debt side, focus on eliminating smaller balances to remove minimum payments, or pay down large balances on high-payment debts. On the income side, document all income sources — part-time work, bonuses, rental income, alimony — since lenders count these with proper documentation. Avoid taking on new debts before applying for a mortgage.
Does DTI affect my interest rate?
Indirectly, yes. While DTI does not directly set a rate, a high DTI may push you toward loan programs with slightly higher rates, reduce your negotiating power with lenders, or require mortgage insurance in some cases. More importantly, it affects whether you qualify at all. Lenders primarily use credit score and LTV for pricing, but DTI determines approval eligibility.
Understanding Debt-to-Income Ratio
Debt-to-income ratio is one of the three most important numbers in mortgage lending, alongside credit score and loan-to-value ratio. It answers a simple but critical question: given what you earn each month, what percentage of that income is already committed to debt payments? The answer tells lenders how much risk they are taking on and how much room you have to absorb a new payment.
The 28/36 guideline
Traditional lending guidelines suggest keeping housing costs below 28% of gross income (the front-end ratio) and total debt payments below 36% (the back-end ratio). These are not rigid legal limits — they are risk thresholds that lenders have found correlate with repayment success. Modern lenders have loosened these somewhat, with FHA and some conventional programs going to 43% or higher, but the lower your DTI, the more options you have and the better your terms.
DTI vs credit score
Credit score measures your history of repaying debt — reliability. DTI measures your current capacity to take on new debt — margin. Both matter, and one cannot substitute for the other. A stellar credit score with a 55% DTI will still fail most mortgage underwriting because you are stretched too thin. Conversely, a clean DTI with poor credit history suggests past unreliability. You need both to qualify for a conventional mortgage at good rates.
Strategies to improve DTI
Because DTI = monthly debt ÷ monthly income, you can improve it from either side. Paying off a small loan or credit card balance eliminates its minimum payment entirely — sometimes reducing your DTI by 2–3 percentage points from one targeted payoff. On the income side, documenting all qualifying income sources (freelance work, rental income, alimony) with proper tax returns expands your denominator. Do not take on new debt in the months before applying — every new minimum payment worsens your ratio.