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Debt-to-Income Ratio Calculator

Estimate front-end and back-end debt-to-income ratios using gross income, monthly housing costs, and recurring monthly debt payments. This 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
Calculation rules
debt-to-income-v1
Engine version
Debt-to-Income Engine V1
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

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Found a calculation issue, outdated source, accessibility problem, or unclear assumption?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.

Income

Income mode
$

Use income before taxes, payroll deductions, retirement contributions, and other deductions.

Housing costs

Enter monthly amounts. The primary field can be mortgage principal and interest or rent. Do not enter the same housing expense twice.

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$
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$

Recurring monthly debts

Enter the monthly payment amounts you want included. This calculator does not apply lender-specific debt exceptions or special formulas.

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$
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Methodology

What Front-End and Back-End DTI Mean

Front-end DTI

Front-end DTI compares monthly housing costs with gross monthly income. It helps isolate the housing portion of the ratio.

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 V1 DTI math. 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?

V1 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.

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 locked engine. 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.

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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.