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Debt-to-Income Ratio Calculator

Calculate current and proposed debt-to-income ratios from gross monthly income, debts, housing, and new debt.

Debt-to-Income Ratio Calculator Inputs

Results computed instantly — your data never leaves your device.

Live Debt-to-Income Ratio Calculator Results

Real-Time

Proposed DTI (%)

233.3%

Proposed DTI is above the 36% reference line.

Current DTI (%)

225.0%

Monthly Debt

$13,500

Headroom to 36%

0.0%

Primary 50.9%Other 49.1%
100% Client-SidePrivate & Secure

How to Use the Debt-to-Income Ratio Calculator

  1. 1

    Enter gross monthly income before deductions.

  2. 2

    Enter existing monthly debt payments and housing payment.

  3. 3

    Add any proposed new monthly debt.

  4. 4

    Review current DTI, proposed DTI, and the displayed headroom to the 36% reference line.

Formula & Mathematical Basis

Current DTI = (Debt + Housing) ÷ Gross Income × 100 | Proposed DTI = (Debt + Housing + New Debt) ÷ Gross Income × 100

Variable Key

Debt

Existing monthly debt payments

Housing

Monthly housing payment

New Debt

Proposed new monthly debt payment

Gross Income

Gross monthly income before deductions

📝 The model reports one decimal place and clamps non-finite or negative inputs to safe non-negative values.

Step-by-Step Examples

1

Current and proposed ratio

Scenario: $6,000 gross monthly income, $1,500 housing, $1,000 existing debt, and $500 proposed debt.

  1. 1.Current monthly obligations = $1,000 + $1,500.
  2. 2.Proposed obligations add the new $500 payment.
  3. 3.Divide each total by $6,000.
  4. 4.Multiply by 100 to display percentages.
✅ The dashboard shows both ratios and headroom to the reference line.
2

Zero-income guard

Scenario: Income is entered as zero.

  1. 1.The denominator is zero.
  2. 2.The formula returns 0% by guard.
  3. 3.No runtime division error is shown.
  4. 4.Enter gross income to restore a meaningful ratio.
✅ The page remains usable without NaN.

Practical Use Cases

  • ✓ Estimate the effect of a new monthly obligation.
  • ✓ Compare current and proposed obligations.
  • ✓ Communicate monthly debt assumptions.
  • ✓ Check a simple reference threshold.
  • ✓ Avoid divide-by-zero output.

Common Pitfalls

  • ⚠ Using take-home pay instead of gross income.
  • ⚠ Omitting housing or recurring debt payments.
  • ⚠ Treating a reference percentage as an approval guarantee.
  • ⚠ Ignoring taxes, insurance, or lender-specific definitions.
  • ⚠ Entering annual income in a monthly field.

Frequently Asked Questions

How is DTI calculated?

DTI is monthly debt obligations divided by gross monthly income, multiplied by 100.

What is proposed DTI?

Proposed DTI adds the entered new debt payment to existing debt and housing before dividing by gross monthly income.

What does the 36% line mean here?

The dashboard uses 36% as a displayed planning reference. Actual underwriting standards vary by product, lender, borrower, and documentation.

What if income is zero?

The calculator returns 0% instead of dividing by zero; enter a valid gross monthly income for a meaningful ratio.

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