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Silvia

Mortgage & Real Estate

Debt-to-Income Ratio Calculator

Calculate your front-end and back-end debt-to-income ratios for mortgage planning.

Best for: Calculate front-end and back-end debt-to-income ratios for mortgage affordability planning.

Your assumptions

Calculate your estimate

Your result

Debt-to-Income Ratio estimate

Back-end DTI
32%
Front-end housing ratio
25%
Monthly debt payments
$3,200.00

How to use this debt-to-income ratio calculator

Use this debt-to-income calculator to separate the proposed housing payment from total recurring debt. Lenders use their own qualifying definitions, but the two ratios help explain how existing obligations affect mortgage capacity.

  1. 1

    Enter gross monthly income

    Use stable income before taxes that a lender may reasonably consider for qualification.

  2. 2

    Add housing and recurring debt

    Include the proposed complete housing payment and required monthly payments reported for other debts.

  3. 3

    Review both DTI ratios

    Compare the housing-only ratio with the total-debt ratio and identify which obligation constrains capacity.

Worked planning example

Example: measure the impact of a car payment

Set up

Enter gross monthly income, a proposed mortgage payment, and all existing minimum monthly debt payments.

Compare

Remove or reduce a car payment in a second scenario and compare the back-end DTI.

Takeaway

Paying off a recurring obligation can improve qualifying ratios even when income and the proposed home price stay unchanged.

Use lender definitions for final qualification

A DTI ratio is a screening measure and does not capture every expense, reserve requirement, or underwriting rule.

  • Use required monthly payments rather than balances.
  • Include taxes, insurance, and HOA dues in housing cost.
  • Keep a personal cash-flow buffer below any lender maximum.

Calculation methodology and assumptions

For this debt-to-income ratio estimate, Silvia uses gross monthly income, proposed monthly housing payment, other monthly debt payments. Calculate your front-end and back-end debt-to-income ratios for mortgage planning. Results are estimates, not quotes, tax advice, or investment recommendations.

Frequently asked questions

What is front-end DTI?

Front-end DTI divides the proposed monthly housing payment by gross monthly income.

What is back-end DTI?

Back-end DTI divides housing plus recurring monthly debt obligations by gross monthly income.

What DTI ratio qualifies for a mortgage?

Limits vary by loan program, lender, credit, reserves, and other compensating factors. Ask the lender which obligations and income it will count.

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