DTI Calculator for a Mortgage
Use this free mortgage DTI calculator to instantly find your front-end and back-end debt-to-income ratio and see how much home you can qualify for.
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Get in TouchDTI, or debt-to-income ratio, is the percentage of your gross monthly income that goes toward paying debts. For a mortgage, most lenders want a back-end DTI of 36–43% or lower, though some loan programs allow up to 50%. To calculate it: divide your total monthly debt payments (including your projected housing payment) by your gross monthly income, then multiply by 100.
How It Works
Your debt-to-income (DTI) ratio compares how much you owe each month to how much you earn. Lenders use it to gauge how much additional debt you can reasonably take on — a lower DTI signals more room in your budget and generally makes you a stronger loan applicant.
Lenders typically look at two versions of DTI:
- Front-end DTI — housing costs only (mortgage or rent, property taxes, insurance) divided by gross income.
- Back-end DTI — all monthly debt obligations, including housing, divided by gross income. This is the number most lenders qualify you on.
DTI Limits by Mortgage Loan Type
Maximum back-end DTI varies by loan program. These are typical lender guidelines — individual lenders can be stricter or more flexible.
| Loan Type | Typical Max DTI | Notes |
|---|---|---|
| Conventional | 36–43% | Up to 45–50% with strong compensating factors (credit score, reserves, down payment). |
| FHA | 43% | Can go up to 50% with compensating factors like a higher credit score. |
| VA | 41% | No hard cap, but lenders typically prefer 41% or lower. |
| USDA | 41% | Some flexibility with strong credit or automated underwriting approval. |
Formula
DTI is calculated as:
- Total Monthly Debt Payments — the sum of all recurring debt obligations (housing, loans, minimum credit card payments)
- Gross Monthly Income — your income before taxes and deductions
Example
Say your gross monthly income is $6,000, and your monthly debts are:
- Rent/mortgage: $1,200
- Car loan: $300
- Credit card minimums: $300
- Total monthly debt: $1,800
DTI = ($1,800 ÷ $6,000) × 100 = 30% — within the range most lenders consider healthy.
Assumptions & Limitations
This calculator estimates a general back-end DTI ratio using the debts and income you provide. Individual lenders may calculate DTI differently, weigh certain debts differently, or apply different qualifying thresholds depending on the loan program. Results are estimates for educational purposes only.
Frequently Asked Questions
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