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Interactive guide · Loans & Credit

How to Calculate Debt-to-Income Ratio

Front-end and back-end DTI, the two numbers every lender checks first.

Open as a plain tool
The formula

How this number is built

front-end = housing ÷ income · back-end = all debt payments ÷ income
Step by step

Calculating it yourself

Step 1

Use gross income before tax and add only income you can document.

Step 2

Include the full housing payment: principal, interest, tax, insurance and HOA.

Step 3

Add minimum payments on revolving debt, not the full balances.

Step 4

Include court-ordered support payments, which lenders always count.

Step 5

Compare both ratios against the 28/36 guide and the 43% qualified-mortgage cap.

Questions

What people ask next

Which ratio matters more?

Back-end, because it captures your entire obligation. Front-end matters most on the housing decision itself.

Does paying off a card help immediately?

Closing out a small balance removes its minimum payment from the ratio, which is often the fastest way to move the number.

Search intent

Searches this page answers

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Estimates, not advice. Every figure here is produced from the inputs you enter and the formula printed on the page. Rules differ by state, carrier, lender and contract, so use these numbers to prepare for a conversation with a qualified professional rather than to replace one. See our full disclaimer.