Calculation details
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
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What does this calculator estimate?
Use this debt-to-income ratio calculator to see two key monthly debt measures. Front-end DTI compares your housing payment with gross monthly income. Back-end DTI includes housing, car payments, student loans, credit cards, and other debt. Enter a target DTI to compare your result with your own goal.
What is the difference between front-end and back-end DTI?
Front-end DTI divides housing costs only by gross monthly income; back-end adds every recurring debt payment, including car loans, student loans, and minimum card payments. Lenders lean on the back-end number because it captures the whole obligation load. A strong front-end ratio with a weak back-end one usually signals non-housing debt is crowding the budget.
Does paying down debt or earning more improve DTI faster?
Both move the ratio, but they differ in speed and durability. Paying off a fixed loan removes its payment permanently; income raises help but can be discounted by lenders if recent or variable. The fastest legitimate fix is eliminating a small payment entirely, then recalculating, because ratio math rewards removals more than trims.
How this calculator works
Formula
DTI = total monthly debt payments / gross monthly income x 100; lenders generally want 36% or less, with housing alone under 28%.
Worked example
$8,000 gross monthly income with $1,800 housing, $400 car, $100 student loans, $50 credit cards and $50 other debt: $2,400 of debts is a 30% DTI, under the 36% target.
Assumptions to verify
- Income is gross monthly income before tax and deductions.
- Debt fields are required recurring monthly payments, not outstanding balances.
- The selected threshold is a planning comparison and not a lender approval rule.
Frequently asked questions
How do you calculate front-end DTI?
Divide your monthly housing payment by gross monthly income, then multiply by 100. Front-end DTI includes housing only.
How do you calculate back-end DTI?
Add housing, car payments, student loans, credit cards, and other monthly debt. Divide the total by gross monthly income and multiply by 100.
What income does this DTI calculator use?
This calculator uses gross monthly income, meaning income before taxes and other payroll deductions.
Cite this tool
BoringToolsKit. “Debt-to-Income Ratio Calculator.” boringtoolskit.com/debt-to-income-ratio-calculator/ (reviewed July 2026). Free to reference in articles, syllabi, and answer posts with a link.
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DTI on $7,500 monthly income
What this means for your numbers: The worked example's 33.3% DTI sits under the 36% guideline with $233/month of headroom before a new payment breaches 36%.
Illustrative breakdown using the worked example above. The calculator computes your own numbers with the same formula.