Debt To Income Ratio Calculator
This debt to income ratio calculator shows what share of your gross monthly income goes towards monthly debt payments. It is a quick way to see how your existing commitments compare with what you earn before tax and other deductions are taken off.
Enter your total monthly debt payments and your gross monthly income in pounds. The calculator then shows your debt-to-income ratio as a percentage, so you can check the figure before a mortgage or other borrowing conversation.
How to use the debt to income ratio calculator
- Add up all of your monthly debt payments, such as loan repayments, credit card minimums and other regular debt commitments.
- Enter that total in the field for monthly debt payments in £.
- Enter your gross monthly income, which is your income before tax and other deductions, in the second field in £.
- Check that both figures are for the same month and that you have not mixed up gross and take-home pay.
- Read the debt-to-income ratio shown as a percentage.
The formula
- Debt-to-income = monthly debt payments ÷ gross monthly income × 100
Worked example
The figures below are made up to show the maths. They are not current prices, rates or product figures.
| Monthly debt payments | £1,800.00 |
|---|---|
| Gross monthly income (before deductions) | £6,000.00 |
- Debt-to-income ratio 30.00%
Tips for an accurate answer
- Use gross income, not take-home pay, because the calculator is built around income before deductions.
- Include only regular monthly debt payments, not everyday spending such as food or bills that are not debts.
- If you have variable income, use a figure you can genuinely rely on rather than your best month.
- Confirm your figures with your lender or bank before relying on the result for a decision, as they may count debts and income differently.
Questions people ask
How to calculate total debt-to-income ratio?
Add up your total monthly debt payments and enter them in the first field. Then enter your gross monthly income in the second field, and the calculator divides the first figure by the second and multiplies by 100.
What profession has the worst debt-to-income ratio?
This calculator works out only your own ratio from the figures you enter, so it cannot tell you about any profession. Enter your own debt payments and gross monthly income to see your personal percentage.
What does the debt-to-income ratio show?
It shows monthly debt payments as a percentage of your gross monthly income. A higher percentage means a larger share of your income is already committed to debt.
Should I enter gross or net income?
Enter gross monthly income, meaning income before deductions such as tax. The calculator is designed around that figure.
What counts as a monthly debt payment?
Regular payments you are obliged to make, such as loan and credit card repayments. Enter the total of these for one month.
Is this calculator financial advice?
No. It is a piece of arithmetic that divides your debt payments by your income. Check the figures with your lender or bank where it matters.
Can I use this for a joint income?
You can enter a combined figure if you know the total debt payments and total gross income for the same month, but check how your lender will treat joint applications.
Sources
This calculator uses the standard loan and interest formulas above and the numbers you type. It needs no outside figures.
An estimate from the numbers you enter, worked out with the formula shown. It is maths, not financial advice: your lender or bank has the final figures. Page checked 23 Oct 2026. Read the disclaimer