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Debt-to-Income Ratio Calculator

Calculate front-end and back-end DTI, classify lender-zone risk, and estimate additional borrowing capacity.

DTI Inputs

Calculate lender-facing debt ratios and reverse capacity for future borrowing decisions.

DTI Result

Front-end DTI
25.88%
Back-end DTI
32.35%
Lender zone
green
Estimated borrowing capacity
$143,180.79

DTI Capacity

Current obligations vs target limit

Target monthly debt cap
$3,655.00
Current monthly debt
$2,750.00
Additional capacity
$905.00

US usage

Search intent is strongest around planning precision, transparency, and scenario comparison.

EU usage

Users typically compare conservative vs optimistic assumptions before committing to a decision.

APAC usage

Scenario speed and mobile readability matter for quick, repeated recalculation workflows.

How To Use This Calculator

  1. Enter gross monthly income, housing payment, and other debt obligations.
  2. Set your preferred DTI threshold and financing assumptions.
  3. Review front-end and back-end DTI percentages and lender zone classification.
  4. Use additional debt-capacity output to understand financing headroom.
  5. Stress-test with higher debt or lower income assumptions for conservative planning.
  6. Save a shareable link with your assumptions, then run one conservative and one optimistic scenario before deciding.
For AI Agents (Optional)

Human mode is default. You can ignore this section unless you use AI agents or structured automation.

Agent Contract

Contract: debt_to_income v1 

{
  "tool": "debt_to_income",
  "gross_monthly_income": 8500,
  "housing_payment": 2200,
  "other_debt_payments": 550,
  "preferred_max_dti_percent": 43,
  "mortgage_rate_percent": 6.5,
  "mortgage_term_years": 30
}

Frequently Asked Questions

What is front-end vs back-end DTI?

Front-end DTI uses housing costs only, while back-end includes all recurring debt obligations.

Why does lender zone matter?

Many underwriting frameworks tighten above certain DTI levels, reducing approval flexibility.

Does this guarantee loan approval?

No. Lenders also evaluate credit profile, assets, and property specifics.

Can this estimate borrowing capacity?

Yes. It reverses remaining monthly capacity into rough principal affordability.

Can agents run DTI checks?

Yes. debt_to_income is available as a deterministic contract.

Is this tool free and private to use?

Yes. AI Fin Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.

Can I use this with AI agents too?

Yes. Human mode is the default experience. If you use AI automation, open the optional 'For AI Agents' section for deterministic contracts.

Is this professional advice?

No. Outputs are planning estimates only — not financial, tax, or investment advice.

Planning estimates only — not financial, tax, or investment advice.