DTI Ratio Calculator (Mortgage)
Front-end and back-end debt-to-income ratios against the 28/36 rule and the 43% qualified-mortgage ceiling.
Formula
Lenders qualify you to the ceiling, not to comfort — a 43% DTI leaves little room for childcare, retirement savings or one missed paycheck. The 28/36 rule predates HOA fees and student-loan-heavy budgets; treat the lender's maximum as a warning, not a target.
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Need dti ratio calculator results fast? Analysts, founders, traders and finance professionals use the DTI Ratio Calculator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About DTI Ratio Calculator (Mortgage)
Front-end and back-end debt-to-income ratios against the 28/36 rule and the 43% qualified-mortgage ceiling. Lenders qualify you to the ceiling, not to comfort — a 43% DTI leaves little room for childcare, retirement savings or one missed paycheck. The 28/36 rule predates HOA fees and student-loan-heavy budgets; treat the lender's maximum as a warning, not a target. The governing relationship is front = housing/income; back = (housing + debts)/income. The DTI Ratio Calculator computes entirely in your browser — free, private (your figures never leave your device) and instant, recalculating live as you change any input.
How to use DTI Ratio Calculator (Mortgage)
- 1Enter Gross monthly income (currency), Proposed housing payment (PITI) (currency), Other monthly debt payments (currency) into the DTI Ratio Calculator.
- 2The result is computed automatically using front = housing/income; back = (housing + debts)/income — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use DTI Ratio Calculator (Mortgage)?
- ✓Computes dti ratio calculator instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the figures you enter stay private
- ✓Shows the formula, a live worked example and references so you can defend the number
Frequently asked questions
What is the formula behind the DTI Ratio Calculator?+
DTI Ratio Calculator uses front = housing/income; back = (housing + debts)/income. Lenders qualify you to the ceiling, not to comfort — a 43% DTI leaves little room for childcare, retirement savings or one missed paycheck. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the DTI Ratio Calculator need?+
Enter Gross monthly income (currency), Proposed housing payment (PITI) (currency), Other monthly debt payments (currency) and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the DTI Ratio Calculator free, and is my data private?+
Yes — it is completely free with no sign-up or usage limit, and it runs entirely in your browser, so the numbers you enter are never uploaded or stored on any server. It is for informational and analytical use, not financial advice.
What should I watch out for when using the DTI Ratio Calculator?+
The 28/36 rule predates HOA fees and student-loan-heavy budgets; treat the lender's maximum as a warning, not a target.
What is the DTI Ratio Calculator based on?+
The method follows authoritative sources: CFPB — qualified mortgage DTI; Fannie Mae guidelines. The formula and references are shown on the page so you can verify and cite the result.
Related Finance tools
Human Life Value (HLV) Calculator
The economic value of your future earnings to your family — the income-replacement basis for sizing a life-insurance cover.
● LiveTerm Life Insurance Coverage Calculator
How much term-life cover you actually need — replacing income, clearing debts and funding goals, net of existing assets and cover.
● LiveDIME Method Life Insurance Calculator
The DIME formula — Debt + Income + Mortgage + Education — a fast, complete way to size a life-insurance cover.
● Live