Debt-to-Income Ratio Calculator

How it works

Debt-to-income, or DTI, is the single number lenders lean on hardest when they decide whether to approve you and at what rate. It is the slice of your gross monthly income already committed to debt payments:

With the defaults, $1,800 in monthly debt payments against $6,000 of gross income is a 30% ratio, comfortably under the 36% mark lenders like to see. Note the income is gross, before taxes, because that is the figure lenders standardize on. Utilities, groceries, and insurance do not count as debt, so leave them out of the top number.

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A worked example: $1,800 of debt on $6,000 income

Before applying for a mortgage, you tally your fixed monthly debts: car loan, student loan, and credit card minimums come to $1,800. Against a gross monthly income of $6,000, that is the ratio underwriters care about most.

Dividing the two gives a 30% debt-to-income ratio. That sits under the 36% mark lenders treat as healthy, which means you likely have room to take on a new monthly payment or redirect that same margin into savings instead.

Lenders read this ratio before almost anything else, so it is worth knowing yours ahead of time. Change the debt and income figures to see which side of 36% your own number lands on, and by how much.

Bringing your ratio down

• Clear a small loan entirely. Removing a payment cuts the top number, and wiping out one small balance often moves the ratio more than chipping at a large one.
• Hold off on new debt. Every new loan or card payment pushes the ratio up, so pause big financed purchases before a mortgage application.
• Raise the bottom number. A raise, a side income, or documented bonus pay all lift gross income and pull the ratio down.

Front-end and back-end DTI

Lenders actually look at two versions of this ratio, and knowing both tells you where you really stand before you apply.

• Front-end, or housing, ratio. This counts only your housing payment, principal, interest, taxes, and insurance, against gross income. A common guideline keeps it at or below about 28%.
• Back-end, or total, ratio. This is the one this calculator produces: every recurring debt payment, housing included, measured against gross income. Lenders lean on it hardest, and the familiar 36% and 43% marks apply here.

The pairing is often written as the 28/36 rule: keep housing near 28% and total debt near 36%. If your back-end number looks healthy but your housing slice is heavy, a lender may still hesitate, so it helps to split the two out when you are sizing up a mortgage. Renters can run the same check by treating a prospective rent or mortgage as the housing figure, which previews how a future payment would fit.

How lenders read the number

Your DTI is not judged in isolation. It sits alongside your credit score, down payment, and cash reserves as one input in the decision, but it carries real weight because it measures whether your income can absorb another payment.

• Under 36% opens doors. Most lenders treat this as comfortable, and it gives you the widest choice of loans and the best shot at a good rate.
• 36% to 43% is workable. Approval is common in this band, though a strong credit score and healthy savings help offset the higher ratio.
• Above 43% narrows options. Many mortgage programs stop near here, though some loans allow more with compensating factors like large cash reserves.

Because the ratio and your rate tend to move together, trimming it before you apply can mean a cheaper loan, not just an easier yes. Even a small improvement can shift the interest you are offered over the life of a long loan, so clearing one balance beforehand often pays for itself.

Common DTI mistakes

A few errors make this ratio read wrong, usually in the direction that surprises you at the worst moment.

• Using net pay. DTI runs on gross income, before taxes. Plug in take-home and your ratio looks worse than the one a lender will actually calculate.
• Forgetting the new payment. When you are shopping for a mortgage or car loan, add the proposed payment to your debts. The ratio that matters is the one after the new loan lands, not before it.
• Counting the wrong bills. Utilities, groceries, phone plans, and insurance are living costs, not debt, so leaving them out is correct. Do include minimum card payments, which are the ones people most often forget.

Enter gross income and only true debt payments and your number will match what a lender sees. It also helps to run it a few months ahead of applying, which leaves time to pay down a balance or hold off on financing a purchase that would push the ratio up. One more subtlety trips people up on joint applications: lenders combine both applicants’ debts and both incomes, so a partner with a car loan can pull your shared ratio in either direction depending on what they earn.

If you are applying together, run the numbers with both sets of debts and both paychecks rather than yours alone. And if your ratio sits close to a threshold, paying a loan down to zero rather than merely lowering its balance is what removes the payment, since a loan you still owe on counts in full until it is gone.