Debt-to-Income (DTI) Calculator

Calculate your front-end and back-end DTI ratios to determine your mortgage qualification potential. Lenders use DTI to assess your ability to manage monthly debt payments.

Income & Debts

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Pre-tax from all sources

Housing Costs

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Other Debts

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Ready to Calculate

Enter your income and monthly debts, then click Calculate to see your DTI ratios and qualification assessment.

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Pro Tip

Focus on paying down credit card balances first - minimum payments are counted in DTI but paying them off provides the biggest ratio improvement per dollar spent.

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Understanding Debt-to-Income Ratios

The debt-to-income ratio is one of the most important metrics lenders use to evaluate your ability to manage monthly mortgage payments. It compares your monthly debt obligations to your gross monthly income, giving lenders insight into your financial health and risk level as a borrower.

There are two types of DTI that lenders evaluate. The front-end ratio (housing ratio) looks exclusively at housing costs including your mortgage payment, property taxes, homeowners insurance, and HOA fees. The back-end ratio (total debt ratio) includes all recurring monthly debts.

The commonly cited guideline is the 28/36 rule: housing costs should not exceed 28% of gross income (front-end), and total debts should not exceed 36% (back-end). However, many loan programs allow higher ratios, particularly FHA loans (31/43) and some conventional programs with compensating factors.

Lowering your DTI before applying for a mortgage can help you qualify for better rates and larger loan amounts. Strategies include paying off credit cards, avoiding new debt, increasing income, or choosing a home at a lower price point.

DTI Formulas

Debt-to-Income Ratio Formulas

Front-End DTI = (Housing Costs / Gross Income) × 100
Back-End DTI = (All Debts / Gross Income) × 100

Where:

Housing Costs = Mortgage + Property Tax + Insurance + HOA

All Debts = Housing Costs + Car + Student Loans + Credit Cards + Other

Gross Income = Monthly pre-tax income from all sources

Example

For $8,000 monthly income with $2,350 housing and $3,150 total debts:

  • • Front-end: $2,350 / $8,000 = 29.4%
  • • Back-end: $3,150 / $8,000 = 39.4%
  • • Assessment: Front-end slightly above 28%, back-end under 43%
  • • Likely qualifies for FHA; may need compensating factors for conventional

Frequently Asked Questions

What is the difference between front-end and back-end DTI?
Front-end DTI (housing ratio) measures only your housing costs (mortgage, taxes, insurance, HOA) as a percentage of gross income. Back-end DTI (total debt ratio) includes all monthly debt obligations including housing, car loans, student loans, credit cards, and other recurring debts.
What DTI ratio do I need to qualify for a mortgage?
Conventional loans typically require a front-end DTI of 28% or less and back-end DTI of 36% or less. FHA loans allow up to 31% front-end and 43% back-end. Some lenders allow higher ratios with strong compensating factors like excellent credit, large down payment, or significant reserves.
Does DTI include utilities and living expenses?
No, DTI only includes fixed debt payments that appear on your credit report or are required for the home. Utilities, groceries, entertainment, gas, and other variable living expenses are not included in DTI calculations.
How can I lower my DTI ratio?
You can lower DTI by paying off existing debts, increasing income, avoiding new debt, paying down credit card balances, extending loan terms for lower payments, or choosing a less expensive home to reduce the mortgage payment.
Is gross or net income used for DTI?
DTI calculations use gross (pre-tax) monthly income, not take-home pay. This includes salary, bonuses, commissions, rental income, social security, and other documented income sources.