Useful Tools Online

Debt-to-Income Calculator

Calculate front-end and back-end debt-to-income ratios from gross monthly income and recurring debt obligations.
CFPB 43% DTI Qualified Mortgage StandardRuns on your device

Inputs

Results update live
Cite this calculator

Uses gross monthly income and debt payments you enter. Lender guidelines vary.

Last reviewed: August 2026

Debt-to-Income Calculator. (August 2026). Useful Tools Online. https://usefultoolsonline.com/debt-to-income-calculator/

Interpretation

How DTI Underwriting Works

Front-end DTI is housing-only (PITI); back-end DTI includes all recurring debts. Many lenders use 28/36 or 43% back-end caps as standards for Qualified Mortgages.

Example

Worked example

A realistic scenario showing how the calculation guides a practical decision.

Income $7,500, housing $1,800, other debts $450 → back-end DTI about 30% (comfortable under common 36% targets).

Watch out

Common mistakes

  • Using net instead of gross income.
  • Omitting co-borrower debts.
  • Forgetting HOA or PMI in housing payment.

Related tools

Adjacent decisions

Home Affordability CalculatorTurn DTI into a maximum home priceMortgage CalculatorEstimate monthly payment on a target homeLoan CalculatorModel other fixed-rate debt paymentsDebt Payoff CalculatorPlan payoff to lower back-end DTI

FAQ

Frequently asked questions

How the calculation works and where its limits are.

What is the difference between front-end DTI and back-end DTI?

Front-end DTI (housing ratio) measures your monthly housing expenses (mortgage principal, interest, taxes, insurance, HOA) divided by gross monthly income. Back-end DTI (total debt ratio) includes housing PLUS all other recurring monthly debts (car loans, student loans, credit card minimum payments, child support) divided by gross monthly income.

What is the maximum DTI allowed for conventional and FHA mortgages?

Conventional conforming mortgages typically require a back-end DTI of 36% to 43% (though automated underwriting may allow up to 45–50% with strong credit and cash reserves). FHA loans typically allow up to 43% to 50% back-end DTI with compensating factors.

Should I use gross income or net take-home pay to calculate DTI?

Mortgage underwriting always uses gross monthly income (pre-tax income before payroll deductions, taxes, and healthcare).

Is this DTI calculation a formal loan qualification?

No. This calculator provides deterministic planning estimates based on your entered figures. Official mortgage pre-approval requires verified W-2s, tax returns, credit reports, and underwriter evaluation.

How can I lower my DTI before applying for a home loan?

You can lower your DTI by paying off high-interest revolving credit card balances, refinancing installment loans to lower monthly payments, or adding a co-borrower with verifiable gross income.