Debt-to-Income Ratio (DTI) Calculator
Calculate front-end and back-end debt-to-income ratios, find required income for target DTI, or determine maximum affordable housing costs. Enter income, housing expenses (PI, taxes, insurance, HOA, PMI), and monthly debts (auto, student, credit cards, personal loans). Compare conventional-style, FHA-style, and VA-style planning scenarios with color-coded status, detailed breakdowns, and what-if analysis. All calculations run locally in your browser for complete privacy.
Calculate your current front-end and back-end debt-to-income ratios.
Income
Monthly Housing Costs
Other Monthly Debts
Target DTI Ratios
How it works: The debt-to-income ratio compares your monthly debt obligations to gross monthly income. Front-end DTI uses housing costs only (PI + taxes + insurance + HOA + PMI), while back-end DTI includes all recurring debts. All calculations run locally in your browser for complete privacy.
What Is a DTI Calculator?
A DTI (debt-to-income ratio) calculator divides your total monthly debt payments by your gross monthly income to produce the percentage lenders use to evaluate your ability to repay a new loan. It’s one of the most important numbers in your mortgage application — often more scrutinized than your credit score in determining loan approval and terms.
There are two DTI ratios that matter: the front-end ratio (housing costs ÷ income) and the back-end ratio (all monthly debt payments ÷ income). Lenders evaluate both, and most programs have specific limits for each.
How to Use This DTI Calculator
- Enter your gross monthly income (before taxes and deductions).
- Enter your proposed monthly housing payment (PITI: principal, interest, taxes, insurance, plus HOA if applicable).
- Enter all other recurring monthly debt payments: car loans, student loans, minimum credit card payments, personal loans.
- Review your front-end DTI (housing only) and back-end DTI (all debts).
- Compare against lender thresholds to assess approval likelihood.
Worked Example: The Patel Family's Home Purchase DTI
The Patels earn $8,000/month gross and are considering a home with $2,400/month PITI. They also have existing debts:
| Debt | Monthly Payment |
|---|---|
| Proposed mortgage (PITI) | $2,400 |
| Car loan | $500 |
| Student loans | $400 |
| Credit card minimums | $200 |
Front-end DTI: $2,400 ÷ $8,000 = 30% (exceeds the 28% conventional target).
Back-end DTI: ($2,400 + $500 + $400 + $200) ÷ $8,000 = $3,500 ÷ $8,000 = 43.75% (exceeds the 36% conventional guideline, but within the 45% Fannie Mae limit).
The Patels may qualify under conventional lending with compensating factors (large down payment, strong credit) or via FHA. Reducing the car payment or targeting a less expensive home brings both ratios into the preferred range.
DTI Thresholds by Loan Type
| Loan Type | Front-End Max | Back-End Max | Notes |
|---|---|---|---|
| Conventional (Fannie/Freddie) | 28% | 36–45% | 45% with strong credit/reserves |
| FHA | 31% | 43–50% | 50% with compensating factors |
| VA | No hard limit | 41% (residual income applies) | Residual income test is primary |
| USDA | 29% | 41% | Rural/suburban eligible properties |
| Jumbo | 28% | 38–43% | Stricter; varies by lender |
What Counts in Your DTI (and What Doesn’t)
Included in back-end DTI: Mortgage payment (PITI), car loans, student loan payments, minimum credit card payments, personal loan payments, child support/alimony payments, co-signed loan obligations.
Not included: Utilities, groceries, health insurance premiums, gym memberships, phone bills, subscriptions, income taxes. These are living expenses, not debt obligations under standard DTI calculations.
Income included: W-2 salary, self-employment income (2-year average), rental income (typically 75% of gross rent), Social Security, pension, alimony received, investment income. Income must be documented and shown to be stable or growing.
Tips for Improving Your DTI Before Applying
- Pay down revolving debt first: Eliminating a credit card balance that carries a $200 minimum lowers your back-end DTI by $200 ÷ gross monthly income. On $8,000/month income, that’s a 2.5 percentage point improvement.
- Avoid new debt before closing: Opening a new auto loan or credit card between pre-approval and closing raises your DTI and can derail the mortgage. Lenders pull credit again at closing.
- Add a co-borrower: A co-borrower’s income is added to the denominator, lowering DTI. Their debts are also added to the numerator, so ensure the net effect is positive.
- Target a less expensive home: Reducing the proposed mortgage by $200/month directly reduces both front-end and back-end DTI. On $8,000 income, that’s a 2.5% improvement in both ratios.
- Increase documented income: If you have a side income, ensure it’s documentable (bank statements, tax returns). Two years of self-employment history is typically required for it to count.
Frequently Asked Questions About DTI
What is a good DTI ratio?
Below 36% back-end DTI is generally considered healthy. Below 28% front-end is ideal for housing. Lenders will approve higher ratios (up to 45–50% for FHA/conventional), but rates and terms may be less favorable, and financial stress risk increases.
Does DTI affect my interest rate?
Not directly, but DTI affects whether you qualify for the loan. Your interest rate is primarily driven by credit score, loan-to-value ratio, and loan type. A high DTI may require mortgage insurance or a larger down payment, indirectly affecting your total cost.
Are student loans counted in DTI even if deferred?
Yes, for most loan programs. Conventional lenders typically count 1% of the outstanding student loan balance or the actual payment, whichever is greater. FHA uses 1% if the actual payment is $0. This can significantly impact DTI for borrowers with large student loan balances in deferment.
Can I get a mortgage with a DTI over 43%?
Yes. FHA allows up to 50% with compensating factors (large reserves, strong credit). Conventional (Fannie/Freddie) allows 45–50% with DU approval. VA has no hard DTI cap but uses a residual income test. Some portfolio lenders have even more flexibility.
How is DTI different from debt-to-equity or leverage ratios?
DTI (debt-to-income) measures monthly cash flow: debt payments as a share of monthly income. Debt-to-equity ratios measure balance sheet leverage: total liabilities vs. total assets. DTI is a cash flow metric; debt-to-equity is a balance sheet metric. Mortgage lenders use DTI.
Related Calculators
- Mortgage Calculator — estimate your proposed monthly PITI payment
- Debt Payoff Calculator — lower existing debt to improve DTI
- Budget Calculator — build a housing affordability budget
- Salary Calculator — convert annual salary to monthly gross income