Dicno LabsFree mortgage tool
Estimate front-end DTI, back-end DTI, total monthly debt, and a simple borrower affordability interpretation.
Affordability signal
A debt-to-income ratio calculator helps borrowers estimate how much of their gross monthly income is already committed to housing and debt payments. Lenders commonly use DTI as one part of the mortgage affordability review.
This tool calculates front-end DTI from your housing payment and gross monthly income. It also calculates back-end DTI by adding car loans, student loans, credit card minimums, and other monthly debts. The result includes total monthly debt and a simple interpretation.
Use this calculator with the Affordability Calculator, Mortgage Calculator, and How Much House Can I Afford? lesson.
Calculator
The estimate updates instantly in your browser as you adjust the inputs.
DTI is commonly used by lenders to estimate borrower affordability, but it does not guarantee approval.
Your input is processed in your browser. Dicno Labs does not upload or store the data you enter in this tool.
How it works
Debt-to-income ratio compares monthly debt obligations with gross monthly income. Mortgage lenders often review DTI because it provides a quick view of how much income is already committed before approving a new housing payment.
Front-end DTI focuses only on the monthly housing payment. To calculate it, divide the housing payment by gross monthly income. Back-end DTI includes housing plus other recurring debts, such as car loans, student loans, credit card minimum payments, and other monthly obligations. To calculate it, divide total monthly debt by gross monthly income.
For example, if gross monthly income is $8,500 and the estimated housing payment is $2,400, the front-end DTI is about 28.2%. If other monthly debts total $850, then total monthly debt is $3,250 and back-end DTI is about 38.2%.
There is no single DTI number that guarantees approval. Lender limits can vary by loan program, credit profile, reserves, property type, and compensating factors. Still, a lower DTI generally creates more breathing room and may make a mortgage plan more durable. If the ratio feels high, consider reducing monthly debts, increasing down payment, choosing a lower home price, or comparing different loan scenarios.
A buyer earning $7,000 per month with a $2,000 housing payment and $600 of other debts has a front-end DTI of 28.6% and a back-end DTI of 37.1%. That estimate can help frame a conversation with a lender before making an offer.
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Related Mortgage Basics lessons
Debt-to-income ratio compares monthly debt payments with gross monthly income. Lenders use it to help estimate borrowing capacity and risk.
Front-end DTI compares the monthly housing payment with gross monthly income.
Back-end DTI compares total monthly debt payments, including housing and other debts, with gross monthly income.
Include recurring monthly obligations such as housing payment, car loans, student loans, credit card minimums, and other monthly debt payments.
Mortgage DTI calculations commonly use gross monthly income before taxes and deductions.
Guidelines vary by lender and loan program. Lower ratios generally give borrowers more room in the budget and may support stronger affordability.
No. Lenders also review credit, assets, employment, loan type, property details, and other underwriting factors.
You may lower DTI by reducing monthly debts, increasing income, choosing a lower housing payment, or increasing the down payment.
Only if you include them in the monthly housing payment input. Use the PITI Calculator to estimate that housing payment first.
No. Your input is processed in your browser. Dicno Labs does not upload or store the data you enter in this tool.
HomeLoan Compass
Download HomeLoan Compass on Google Play for more complete mortgage planning tools, including affordability planning, loan comparison, amortization schedules, and future premium tools.