Debt-to-Income Ratio Calculator

The two numbers this calculator produces - a front-end ratio and a back-end ratio - come from dividing your monthly debt payments by your monthly gross income. That arithmetic is simple; getting an accurate, lender-realistic number depends on what you feed into each field. Below is a walkthrough using the calculator's own default entries, followed by what this ratio does and doesn't tell you, and then the edge cases that trip people up most often.

What the Default Numbers Above Are Actually Doing

Load the calculator with its defaults - $5,000 gross monthly income, a $1,500 mortgage/rent payment plus $200 property tax and $100 insurance, and $400/$150/$250 for a car payment, credit cards, and student loans - and here's the math it runs:

• Housing debts: $1,500 + $200 + $100 + $0 (HOA) = $1,800/month.
• Front-end ratio: $1,800 ÷ $5,000 = 36% - right at the edge of what most conventional lenders consider comfortable for housing costs alone.
• Total monthly debts: $1,800 housing + $400 car + $150 cards + $250 student loans = $2,600/month.
• Back-end (overall) ratio: $2,600 ÷ $5,000 = 52% - which the calculator flags as "Poor," since it crosses the 50% threshold where most conventional and even FHA underwriting becomes difficult.

Notice the gap between the two ratios: housing alone looks borderline reasonable at 36%, but once the car payment, cards, and student loans are added in, the picture changes considerably. That gap is exactly why lenders look at both numbers rather than either one alone.

A DTI Ratio Is a Snapshot of Debt Load - It Isn't the Whole Picture

DTI only measures how much of your income is already promised to creditors each month. It says nothing about how fast that debt is shrinking or whether you have any cushion if income stops. Two other calculators on this site fill in those gaps:

• Our Credit Card Payoff Calculator is forward-looking: instead of a single ratio, it projects how many months it takes to clear a balance at a given payment and how much interest you'll pay along the way. If your DTI is high specifically because of revolving card debt, that tool shows the path down, not just the current snapshot.
• Our Emergency Fund Calculator measures something DTI doesn't touch at all - liquid savings. A borrower can have an excellent 25% DTI and zero savings, or a rough 48% DTI and six months of expenses banked. Lenders and advisors weigh both; a healthy ratio here doesn't automatically mean you're covered for a job loss or a broken furnace.

Run all three if you're preparing for a mortgage application or just taking stock of your finances: this calculator for the underwriting-style ratio, the payoff calculator for your debt timeline, and the emergency fund calculator for your safety margin.

Questions the Formula Raises

Minimum payment or full statement balance for credit cards?
Minimum payment - that's what the field is built for and what most lenders pull from your credit file. Paying more than the minimum helps your balance and your future DTI, but it doesn't change today's calculated ratio.

Gross or net income?
Gross, pre-tax income. Entering take-home pay instead will make your DTI look artificially worse than a lender would actually calculate it.

Do deferred student loans still count?
Often yes. Many lenders apply either your standard repayment amount or a small percentage of the balance even during deferment or forbearance, so entering your normal payment (not $0) gives a more realistic, conservative result.

Does a debt that's almost paid off still count in full?
In this tool, yes - every entry counts at its full monthly amount. Some lenders exclude obligations with roughly 10 months or fewer remaining; if that applies to you, try the calculation both with and without that debt to see the range.