Front-End DTI
Front-end DTI compares monthly housing costs with gross monthly income. It helps isolate the housing portion of the ratio.
Calculator
Debt-to-Income (DTI) Ratio Calculator
Use this debt-to-income ratio calculator to find your front-end and back-end DTI. Enter your gross income, monthly housing costs and recurring debt payments, and the DTI calculator shows what share of your income goes to housing and to all debts combined.
Mortgage lenders compare these ratios with their own limits when they review an application, so knowing your numbers helps you prepare. This tool is educational and does not predict loan approval.
Trust and methodology
How This Calculator Is Reviewed
- Calculation type
- Front-end and back-end debt-to-income ratio estimate
- Jurisdiction
- General gross-income DTI education; lender and loan-program rules vary
- Last reviewed
- 2026-07-31
This is an educational gross-income DTI estimate, not financial, legal, tax, lending, underwriting, approval, or eligibility advice.
Primary Sources
- What is a debt-to-income ratio?Consumer Financial Protection Bureau - United StatesSupports the consumer definition of monthly debt payments divided by gross monthly income and the statement that lenders and products have different limits.
- 12 CFR Section 1026.43, Minimum standards for transactions secured by a dwellingConsumer Financial Protection Bureau - United StatesSupports the distinction between educational DTI estimates and lender-specific ability-to-repay or underwriting standards.
- Selling Guide B3-6-02, Debt-to-Income RatiosFannie Mae - United StatesSupports the underwriting context for DTI and why lender/program calculations are not universal.
- Selling Guide B3-6-03, Monthly Housing Expense for the Subject PropertyFannie Mae - United StatesSupports housing-expense categories such as principal, interest, taxes, insurance, association dues, and mortgage insurance.
- Selling Guide B3-6-05, Monthly Debt ObligationsFannie Mae - United StatesDescribes common debt categories and special underwriting rules this calculator does not model.
- Selling Guide B3-6-01, General Information on LiabilitiesFannie Mae - United StatesSupports liability-assessment context and why this calculator avoids special lender exceptions.
- Guide Section 5401.2, Monthly debt payment-to-income ratioFreddie Mac - United StatesSupports the concept of monthly housing expense plus monthly liabilities compared with stable monthly income.
- Guide Section 5401.1, Monthly housing expense-to-income ratioFreddie Mac - United StatesSupports the distinction between housing-expense ratio and total monthly debt ratio.
- Single Family Housing Policy Handbook 4000.1U.S. Department of Housing and Urban Development - United StatesDescribes FHA underwriting rules that this educational calculator does not model.
Known Limitations
- The calculator does not predict loan approval, mortgage eligibility, lender decisions, or program-specific qualification.
- Credit score, loan-to-value ratio, down payment, assets, reserves, employment history, loan type, and property type are not modeled.
- Self-employment underwriting, variable-income analysis, special student-loan rules, co-signed-debt exceptions, debts paid by another person, payoff timing, and residual-income tests are excluded.
- Ordinary living expenses such as utilities, groceries, fuel, phone bills, internet, subscriptions, taxes, retirement contributions, and discretionary spending are excluded.
- No universal DTI threshold or approval classification is applied.
Found a calculation issue, outdated source, accessibility problem, or unclear assumption? Contact us.
Enter Income, Housing, and Debt
Defaults are examples only, not recommendations. DTI uses gross income before taxes and deductions.
Methodology
What Front-End and Back-End DTI Mean
Back-End DTI
Back-end DTI compares total monthly housing and recurring debt obligations with gross monthly income.
Gross Income Basis
This calculator uses income before taxes and deductions. It does not calculate payroll taxes or take-home pay.
Lenders and loan programs may treat income, debts, and exceptions differently. This page shows educational ratios from the values entered; it does not determine whether a loan will be approved.
What to Include
Include monthly housing costs such as mortgage payment or rent, property taxes, insurance, HOA or association dues, mortgage insurance, and other required housing expenses.
Include recurring monthly debts such as credit card minimums, auto-loan payments, student-loan payments, personal or installment-loan payments, alimony and child support, and other recurring debt you want reflected in the ratio.
What Is Excluded
Ordinary living expenses are not included in this debt-to-income estimate. Examples include utilities, groceries, fuel, phone bills, internet, subscriptions, taxes, retirement contributions, and discretionary spending.
Those expenses can still matter for a real budget. They are simply outside this calculator's debt-to-income formula.
Worked Examples
Monthly Income Example
Gross monthly income of $6,000, housing of $1,500, and non-housing debt of $500.
- Front-end DTI
- 25.00%
- Back-end DTI
- 33.33%
Annual Income Example
Gross annual income of $72,000, housing of $1,800, and non-housing debt of $600.
- Gross monthly income
- $6,000.00
- Front-end DTI
- 30.00%
- Back-end DTI
- 40.00%
Limitations
- Credit score, loan-to-value ratio, down payment, assets, reserves, employment history, loan type, and property type are not modeled.
- Self-employment underwriting, variable-income analysis, special student-loan rules, co-signed-debt exceptions, debts paid by another person, and payoff timing are excluded.
- Jurisdiction-specific rules and lender-specific underwriting are not modeled.
- This calculator is an educational estimate and is not a loan approval or eligibility decision.
Debt-to-Income Ratio Calculator FAQ
What is debt-to-income ratio?
Debt-to-income ratio compares monthly debt obligations with gross monthly income. It is one way to understand how much of income is already committed to housing and recurring debt payments.
What is front-end DTI?
Front-end DTI compares monthly housing costs with gross monthly income. Housing costs can include mortgage payment or rent, property taxes, insurance, HOA dues, mortgage insurance, and other required housing expenses.
What is back-end DTI?
Back-end DTI compares total monthly housing and recurring debt obligations with gross monthly income. It includes the housing total plus recurring debt payments entered in the form.
Is DTI based on gross or net income?
This calculator uses gross income before taxes and deductions. It does not calculate payroll taxes or net pay.
Which debts are included?
The calculator includes credit card minimums, auto loan payments, student loan payments, personal or installment loan payments, alimony and child support, and other recurring monthly debt entered by the user.
Are utilities and groceries included?
No. Ordinary living expenses such as utilities, groceries, fuel, phone bills, internet, subscriptions, taxes, retirement contributions, and discretionary spending are excluded from the DTI calculation.
What DTI do mortgage lenders use?
There is no universal cutoff in this calculator. Lenders and loan programs may use different thresholds and may apply additional underwriting rules. Read what counts as a good debt-to-income ratio for a mortgage.
Can DTI be over 100%?
Yes. A back-end DTI over 100% means the entered monthly housing and debt obligations are greater than gross monthly income. The calculator still shows the result instead of treating it as invalid.
Does a low DTI guarantee loan approval?
No. Loan decisions can involve credit history, assets, reserves, employment history, loan type, property details, and lender-specific rules not modeled here.
Can annual income be used?
Yes. Annual gross income is divided by 12 inside the calculator. The unrounded monthly value is used for ratio calculations.
How can someone lower their DTI?
In general, DTI can decrease when income rises or monthly debt obligations fall. This calculator does not provide personalized financial advice.
Does this calculator follow every lender's rules?
No. It is an educational estimator and does not model every lender, loan program, special debt rule, or underwriting exception.
What is the 28/36 rule?
The 28/36 rule is a common guideline that suggests spending no more than 28% of gross monthly income on housing (front-end DTI) and no more than 36% on all debts combined (back-end DTI). It is a rule of thumb, not a lender requirement; actual limits vary by lender and loan program.
How do I calculate my debt-to-income ratio by hand?
Add up your monthly debt payments, divide by your gross monthly income and multiply by 100. For example, $2,000 in monthly debts ÷ $6,000 income = 33.33%. The calculator does this for both front-end and back-end DTI.
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This calculator provides estimates for informational purposes only. It is not financial, legal, tax, lending, underwriting, approval, or eligibility advice. Lender requirements and loan-program rules vary. Read the full disclaimer.