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Debt-to-Income Calculator — Your DTI, the Mortgage Gap, and What to Fix

Calculate your front-end and back-end DTI ratios, see if you qualify for a mortgage at the 43% threshold, and find the exact monthly debt cut or income increase you need.

Quick answer: Estimate front-end and back-end debt-to-income ratios for mortgage planning from entered income, housing costs, and monthly debt obligations. Enter Gross Monthly Income, Monthly Housing Payment (PITI), All Other Monthly Debt Payments, and Target DTI (%) to personalize the estimate. It returns Back-End DTI (All Debts), Front-End DTI (Housing Only), and Signed Monthly Debt Above Target so you can compare the impact before choosing a next step. Use it to compare payment, equity, rate, and timing tradeoffs before applying or changing a loan.

Back-End DTI (All Debts)
32.50%
Back-End DTI (All Debts)
32.50%
Front-End DTI (Housing Only)
25.00%
Signed Monthly Debt Above Target
-$840
Gross Monthly Income at Target
$6,047
Your DTI vs lender thresholds
Diagnostic

Your back-end DTI is 32.50%. The signed monthly debt amount above the 43.00% planning target is -$840.

At the entered debts, gross monthly income of $6,047 corresponds to that target; this does not predict approval.

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What to do next

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Your action plan
  1. 1

    Review the risk level and primary pressure point

    Estimate front-end and back-end debt-to-income ratios for mortgage planning from entered income, housing costs, and monthly debt obligations.

  2. 2

    Pressure-test one alternate scenario before deciding

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Save the result to Money Map or use the linked next action

    Turn the result into a prioritized action instead of treating it as a one-off number.

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This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

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For a personalized rate comparison, use the tool below to see lenders ranked by APR, loan type, and your profile.

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Frequently Asked Questions

Everything you need to know.

What DTI do I need for a mortgage?
Most conventional lenders require a back-end DTI of 43% or below. FHA loans allow up to 50% with strong compensating factors (large down payment, substantial cash reserves, or a high credit score). The lower your DTI, the better your rate options. Aim for 36% or below for the widest lender choice.
What counts as monthly debt for DTI?
Lenders include: housing PITI, car loans, student loans, minimum credit card payments, personal loans, and child support. They do NOT include utilities, insurance (non-housing), food, subscriptions, or medical bills.
How do I lower my DTI quickly?
Two levers: reduce debt (pay off a credit card, pay down a car loan) or increase income (raise, side income, bonus). Paying off a $300/mo car payment reduces your DTI by 300/gross-income. A $500/mo raise reduces your DTI by reducing the ratio. The calculator shows you which lever moves your DTI the most for your situation.
Is the Debt-to-Income Calculator — Your DTI, the Mortgage Gap, and What to Fix free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the Debt-to-Income Calculator — Your DTI, the Mortgage Gap, and What to Fix affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to see current mortgage rates, or run Money Map to compare this home & mortgage decision with your other opportunities.
How does SwitchWize choose related offers?
Related offers are matched by the calculator surface (mortgage) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.
How fresh are the rates and offers shown?
Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.
Where can I see the ranking methodology?
The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

Lenders use DTI to decide whether you qualify for a mortgage. Most conventional loans require a back-end DTI below 43%; Fannie Mae allows up to 50% with compensating factors. At 38% DTI, you are in the preferred zone. At 50%+, you will likely be denied. This calculator shows both ratios and the exact gap between where you are and where you need to be.

How to Use It

  1. 1Enter your gross monthly income before taxes
  2. 2Enter your estimated housing payment (PITI — principal, interest, taxes, insurance)
  3. 3Add all monthly debt obligations: car payments, student loans, minimum credit card payments
  4. 4See your front-end DTI (housing only), back-end DTI (all debt), and what you need to change
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