Mortgage & financing
Debt-to-income Ratio Calculator
Itemize household income and monthly housing, vehicle, credit-card, line-of-credit and other debt payments. Enter required payments, not outstanding loan balances.
Calculate your result
What this calculator estimates
Compare recurring monthly debt payments with gross monthly income. It combines the inputs below to produce Total debt-to-income ratio. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.
Worked example
Using the displayed sample assumptions, the calculator produces 35.50%. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.
Inputs and assumptions
- Gross annual salary / business income — sample input: 120000 currency units
- Co-borrower gross annual income — optional — sample input: 0 currency units
- Annual pension income — optional — sample input: 0 currency units
- Annual investment / rental income — optional — sample input: 0 currency units
- Other annual qualifying income — optional — sample input: 0 currency units
- Monthly rent OR mortgage principal and interest — sample input: 2800 currency units
- Monthly property tax — optional — sample input: 0 currency units
- Monthly home / mortgage insurance — optional — sample input: 0 currency units
- Monthly HOA / condo / strata fees — optional — sample input: 0 currency units
- Monthly heating (if included by your lender) — optional — sample input: 0 currency units
- Monthly vehicle loan / lease payments — sample input: 350 currency units
- Monthly required credit-card payments — sample input: 150 currency units
- Monthly required line-of-credit payments — optional — sample input: 0 currency units
- Monthly student loan payments — optional — sample input: 0 currency units
- Monthly personal loan payments — optional — sample input: 0 currency units
- Monthly alimony / child support obligations — optional — sample input: 0 currency units
- Other monthly debt payments — optional — sample input: 250 currency units
- Your target total debt-to-income ratio — sample input: 36 %
How to interpret the result
Compare the payment with your total housing budget, not income alone. Compare a conservative case with an expected case and keep a record of the assumptions used.
Common mistake to avoid
Avoid assuming the lowest advertised rate applies to every borrower. Local definitions, taxes, lending practices and measurement requirements can materially change the result.
Calculation details
DTI = total monthly housing and debt payments ÷ gross monthly income. Housing ratio uses housing costs only. Target capacity = gross monthly income × your target ratio. Lenders define qualifying income and obligations differently; this is not an approval calculation.
Results included
- Total debt-to-income ratio
- Monthly gross household income
- Monthly housing costs
- Monthly non-housing debt
- Vehicle payments
- Credit-card payments
- Line-of-credit payments
- Student loan payments
- Personal loan payments
- Support obligations
- Other debt payments
- Housing-to-income ratio
- Total monthly obligations
- Gross income after listed obligations (before tax)
- Monthly capacity at your target
- Additional debt capacity at target
- Monthly reduction needed to meet target
- Annual income needed at target
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Reviewed 2026-09-08.