Debt-to-Income Calculator
Calculate your Debt-to-Income (DTI) ratio, front-end housing ratio, and borrowing readiness for mortgage loan approvals.
Input Parameters
Live Result
Details
Steps
Sum total monthly recurring debt obligations
Calculate Back-End DTI Ratio (Total Debt ÷ Monthly Income)
Compare against bank mortgage underwriting standard (28/36 rule)
Quick Answer & Understanding Your Result
A Debt-to-Income (DTI) Calculator computes your Front-End Housing Ratio and Back-End Total DTI Ratio, the primary metric mortgage underwriters evaluate for loan approval.
Underwriting Ratio Standards
- Front-End DTI (Housing Ratio): (Monthly Housing Costs ÷ Gross Income × 100%) (Target threshold: ≤ 28%).
- Back-End DTI (Total Debt Ratio): ((Housing + Car Loans + Credit Cards + Student Loans) ÷ Gross Income × 100%) (Target threshold: ≤ 36% to 43%).
- Qualified Mortgage (QM) Cap: Federal rules generally cap maximum Back-End DTI at 43% (or up to 50% with compensating factors for FHA loans).
Mortgage & Loan Readiness
- Pre-Approval Qualification: Determining maximum affordable home purchase price without loan rejection.
- Debt Optimization: Identifying which debts to pay down to lower DTI into prime underwriting tiers.
Enter your gross monthly income, proposed housing payment, and recurring debt payments above to calculate your DTI ratio instantly.
Formula & Calculation Logic
Mathematical FormulaUnderwriting ratio formulas:
- Gross Monthly Income: Pre-tax total earnings from all verifiable sources.
- Total Monthly Debt Payments: Sum of housing, minimum credit card payments, auto loans, and personal debts.
Step-by-Step Guide
Enter Gross Monthly Income
Input pre-tax monthly income from salary, business, and bonuses (e.g. $8,000).
Enter Housing Costs
Input mortgage principal, interest, taxes, and insurance (PITI) (e.g. $2,000).
Enter Recurring Debts & View DTI
Input car loans, credit card minimums, and student loans to receive approval rating.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Income: $8,000/mo | Housing: $2,000 | Other Debts: $800 | $2,800 total debt ÷ $8,000 = 35.0% (Well within 36% conventional threshold). | ||
| Low Debt Professional ($10,000 Income) | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
Fannie Mae Selling Guide - Debt-to-Income Ratios
Consumer Financial Protection Bureau (CFPB) - What is DTI?
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Front-End DTI (%) = (Monthly Housing Costs ÷ Gross Monthly Income) × 100%
Last Reviewed: August 21, 2026
Primary Source: Fannie Mae Selling Guide - Debt-to-Income Ratios
Reference Document: Consumer Financial Protection Bureau (CFPB) - What is DTI?
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated financial results are modeled based on standard financial and mathematical formulas. For actual contracts or commercial loans, official amortizations will depend on lender-specific terms, fees, and regulatory provisions.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.