Quick answer
DTI = monthly debt payments ÷ gross monthly income × 100. Debts of $1,800 on a gross income of $6,000 give a DTI of 30%.
Enter monthly debt payments and gross monthly income. The calculator returns the DTI. Use this debt-to-income ratio calculator to check your own figures.
Related tools: Debt Ratio Calculator: Total liabilities as a share of total assets. Debt Service Coverage Ratio Calculator: Net operating income relative to annual debt payments. Current Ratio Calculator: Current ratio from current assets and current liabilities.
How to use the Debt-to-Income Ratio Calculator
- Enter monthly debt payments ($) (0 or more).
- Enter gross monthly income ($) (above 0).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Monthly debt payments | A number, in $ | ≥ 0 |
| Gross monthly income | A number, in $ | > 0 |
Formula and method
Formula
DTI = monthly debt payments ÷ gross monthly income × 100
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
Lenders set their own limits; none is assumed here.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Monthly debt payments = 1800; Gross monthly income = 6000.
| Result | Value |
|---|---|
| Debt-to-income ratio | 30% |
Example 2
Inputs: Monthly debt payments = 2500; Gross monthly income = 7200.
| Result | Value |
|---|---|
| Debt-to-income ratio | 34.7222% |
The first line is the headline result (debt-to-income ratio). IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
What lenders look for
Many mortgage lenders prefer a DTI under 36%, with a maximum around 43% for qualified mortgages, although some programs allow more. A lower DTI improves your chances and rate.
What to include
Include minimum payments on loans, credit cards, rent or mortgage and alimony, but not groceries or utilities. Use gross income before tax. Income must be positive.
How the result changes with monthly debt payments
Holding every other input at the first worked example, this table changes only monthly debt payments. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Monthly debt payments | Debt-to-income ratio |
|---|---|
| 900 | 15% |
| 1800 | 30% |
| 3600 | 60% |
| 7200 | 120% |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Gross monthly income: entering "0" shows "Gross monthly income must be greater than 0." beside that field and no result.
- Monthly debt payments: entering "-5" shows "Monthly debt payments must be at least 0." beside that field and no result.
Choosing between the Debt-to-Income Ratio Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Debt Ratio Calculator](/finance/debt-ratio-calculator/) | total liabilities and total assets | Debt ratio |
| [Debt Service Coverage Ratio Calculator](/real-estate/debt-service-coverage-ratio-calculator/) | net operating income and annual debt service | DSCR |
| [Current Ratio Calculator](/business/current-ratio-calculator/) | current assets and current liabilities | Current ratio |
| [Quick Ratio Calculator](/business/quick-ratio-calculator/) | cash and equivalents, accounts receivable and current liabilities | Quick ratio |
| [Debt Consolidation Calculator](/finance/debt-consolidation-calculator/) | total balance, current average APR and total monthly payment now | Interest saved |
Background: personal finance estimates
Financial calculators project from the numbers you give them. Long-range tools depend on guesses about returns and tax rates that are unlikely to hold exactly, payoff tools assume a fixed payment and rate, and tax or salary results depend on the tax year, filing status and country. Official calculators say their output is for reference only.
For decisions that matter, use conservative inputs and check the figures against your lender, plan documents or a qualified adviser.
Assumptions and limitations
- Income must be positive
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for gross monthly income and monthly debt payments to confirm this.
Frequently asked questions
How do I lower my DTI?
Pay down debts or raise income.
Does DTI affect my credit score?
Not directly. Credit scores use credit reports, which don't include income, though lenders use DTI to approve loans.
What is front-end DTI?
Housing costs divided by gross income.
What does the Debt-to-Income Ratio Calculator calculate?
Monthly debt payments as a share of gross monthly income. It returns Debt-to-income ratio.
What formula does the Debt-to-Income Ratio Calculator use?
DTI = monthly debt payments ÷ gross monthly income × 100. Lenders set their own limits; none is assumed here.
What do I need to enter in the debt-to-Income Ratio Calculator?
You enter Monthly debt payments ($) and Gross monthly income ($).
How is the result rounded or limited?
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice. Income must be positive.
What is an example of a debt-to-Income Ratio result?
With monthly debt payments 1800 and gross monthly income 6000, the debt-to-income ratio is 30%.
Can I rely on this calculator for a decision?
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser. For this calculator in particular: Income must be positive.
Related calculators
- Debt Ratio Calculator — Total liabilities as a share of total assets.
- Debt Service Coverage Ratio Calculator — Net operating income relative to annual debt payments.
- Current Ratio Calculator — Current ratio from current assets and current liabilities.
- Quick Ratio Calculator — Acid-test ratio of liquid assets to current liabilities.
- Debt Consolidation Calculator — Interest saved by replacing your debts with one fixed loan.
- Return on Equity Calculator — Net income relative to average shareholders' equity.
Sources
- Standard time-value-of-money relations (e.g. Brealey, Myers & Allen, Principles of Corporate Finance)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.