Debt-to-Income Calculator

About this Debt-to-Income Calculator

The Debt-to-Income Calculator divides recurring monthly debt payments by gross monthly income to produce a simple DTI percentage. Lenders may define qualifying income and debt differently, so this should be treated as a general planning figure.

Lenders use debt-to-income ratio (DTI) as a key factor when evaluating mortgage, auto loan and credit applications, because it estimates how much of your income is already committed to existing debt payments.

For related tasks, try Mortgage Calculator, Car Loan Calculator or Salary to Hourly Calculator.

How the calculation works

DTI equals monthly debt payments ÷ gross monthly income × 100. Real underwriting can include specific rules about which obligations and income sources count.

How to use it

1. Enter total recurring monthly debt payments.
2. Enter gross monthly income before deductions.
3. Calculate to see the estimated DTI ratio.

Practical example

Monthly debts of 1,200 with gross income of 4,000 produce a DTI of 30%.

Someone with 2,000 in monthly debt payments and a 6,000 gross monthly income has a DTI of 33.3%, a figure many conventional mortgage lenders would consider within an acceptable range, though the exact threshold depends on the specific loan program.

Things to double-check

Lenders often distinguish between front-end DTI (housing costs only) and back-end DTI (all debt payments combined), and different loan types have different maximum DTI thresholds they'll approve, commonly somewhere in the 36-43% range for many conventional mortgages.

How the ratio is calculated and read

Debt-to-income is your total monthly debt payments divided by your gross monthly income. If rent is 900, a car loan is 300, a student loan is 150 and card minimums are 50, your debts total 1,400. With 4,500 of gross income the ratio is about 31 percent. Lenders read this as the share of your income that is already committed. A figure below roughly 36 percent is generally seen as comfortable, between 36 and 43 percent is workable but tighter, and above 43 percent can make approval for a mortgage difficult. These thresholds differ between countries, lenders and loan types, so treat them as a guide.

What counts as debt

Lenders usually count regular obligations to repay money or support: rent or mortgage, loan instalments, minimum credit card payments, child support and alimony. They usually leave out everyday living costs such as groceries, utilities, insurance, phone bills and subscriptions, even though they affect your budget. To see how a new loan might look to a lender, add its expected monthly payment to your debts and recalculate. Adding a 400 car payment to the example above raises the debts to 1,800, which is 40 percent of 4,500 and moves you into a tighter range, so test the number before you apply.

Lowering your ratio

There are two ways to lower the ratio: reduce the monthly debt or raise the income. Paying off a small loan with a high monthly instalment often helps more than paying a little extra on a large one. Avoid taking on new credit shortly before applying for a big loan. Refinancing to a longer term lowers the payment but increases total interest, so it improves the ratio at a cost. A co-borrower with a steady income can also change the result. Keep in mind that debt-to-income is separate from a credit score: you can have a high score and a high ratio, and a lender will look at both.

A quick affordability test

You can turn the ratio around to see how much room is left for a new payment. At an income of 4,500 and a target ratio of 36 percent, total monthly debt payments should stay near 1,620. If you already pay 1,400, only about 220 is left for a new commitment. At a 43 percent ceiling the limit is 1,935, which leaves about 535. These are not rules, but they show how quickly existing obligations use up borrowing room. Remember that a lender's calculation also depends on your documented income, so use net or irregular income carefully.

The 28/36 guide for mortgages

A traditional guide for home loans is the 28/36 rule: housing costs should stay below 28 percent of gross income, and total debts, including housing, below 36 percent. With a gross monthly income of 6,000, that means housing of at most 1,680 and total debts of at most 2,160. Lenders may approve higher ratios, particularly for borrowers with strong credit or large deposits, but a high ratio leaves less room for emergencies. Use the calculator with the new payment included, and consider what would happen if your income dropped or the interest rate rose.

Worked example: should you take on a new loan?

Suppose your gross monthly income is 5,200 and you pay 1,050 in rent, 280 on a car loan, 120 on a student loan and 60 in credit card minimums, a total of 1,510. Your debt-to-income ratio is 1,510 divided by 5,200, which is 29 percent. You want a personal loan with a payment of 220. Adding it makes the total 1,730 and the ratio 33.3 percent, which still falls under the common guide of 36 percent. A second new loan of 300 would take the total to 2,030 and the ratio to 39 percent, which many lenders would see as stretched. Testing each possible payment before you apply helps you borrow only what you can sustain.

What lenders look at besides the ratio

The ratio is one input among several. Lenders also look at your credit score, the stability of your income, how long you have been in your job, your savings and the size of your deposit. A borrower with a ratio of 40 percent but strong savings and a long record of on-time payments may be approved, while someone with a lower ratio but unstable income may be refused. Different loan types have different rules: some government-backed mortgage programmes allow ratios above 43 percent in particular cases. Ask a lender for the guidelines they use, and understand that the number is a tool to estimate risk, not a verdict on you.

Gross income, net income and the real budget

Lenders use gross income, before tax, but your budget is made from what lands in your account. A ratio of 36 percent of gross income can be close to 45 percent of net income, depending on your tax. For your own planning, calculate a second ratio using take-home pay, and check that the remainder covers food, utilities, insurance, transport and savings. If you are paid irregularly or commission-based, use a conservative average over the past year. A ratio that looks acceptable on paper can still feel tight in practice, which is a sign to borrow less.

Improving your ratio before you apply

There are practical ways to improve the ratio in a few months. Pay down credit cards, which often have high minimum payments for small balances. Settle small instalment loans with only a few payments left. Avoid opening new credit lines or financing purchases while you prepare an application. If you have a side income that is documented in tax returns, it can count toward your income. Some people also add a co-borrower with steady income. Keep the improvement realistic: a lower ratio helps only if you can keep it, so do not rely on a plan that depends on a temporary bonus.

Key terms explained

Gross income is your income before tax and deductions. The front-end ratio compares housing costs alone with gross income, and the back-end ratio compares all monthly debt payments with gross income. Revolving debt, such as credit cards, has a flexible balance and a minimum payment, while instalment debt, such as a car loan, has fixed payments. A qualifying income is the amount a lender accepts after checking documents. A co-signer is a second person who agrees to repay if you do not, and their income and debts may be considered as well.

Rules of thumb and quick checks

The 28/36 guide suggests housing under 28 percent and total debt under 36 percent of gross income, and many lenders cap the back-end ratio around 43 percent. Each 100 of monthly debt adds 2 points to the ratio for a gross income of 5,000, so paying off a loan with a 150 payment lowers it by 3 points. Compare your ratio before and after any new loan, and keep a margin: borrowers who are close to the limit have the least room if costs rise or income falls.

Frequently asked questions