Free Debt-to-Income Ratio Calculator

What your DTI ratio tells a lender

Debt-to-income is the single figure lenders lean on hardest when deciding how much you can borrow. It's your total monthly debt payments divided by your gross monthly income — and because it's built on payments rather than balances, it can be improved faster than most people assume.

The thresholds that matter

• Under 36% is the range most lenders view favorably and where the widest set of loan options stays open.
• 36–43% is workable for many programs, often with compensating strengths like a high credit score or substantial reserves.
• Above 43% starts closing doors. Qualified Mortgage rules historically treated 43% as a key boundary, and while the landscape has evolved, many lenders still treat it as a practical ceiling.

At 37.5%, the example sits just above the comfortable band. Reducing monthly obligations by only about $90 — roughly a quarter of that car payment — would bring it under 36%. That's the useful insight: small payment reductions near a threshold have outsized effects on qualification.

Front-end versus back-end

The front-end ratio counts housing alone; the back-end counts everything. Lenders generally apply both, commonly around 28% and 36%, and whichever binds first sets your limit.

Knowing which one constrains you determines what actually helps. If your back-end ratio is the problem, paying off a car loan raises your buying power directly. If front-end binds, other debts aren't the issue — income or down payment is. The House Affordability Calculator shows how both interact.

What counts and what doesn't

Included are payments that appear on your credit report: mortgage or rent, auto loans, student loans (even in deferment, where lenders often impute a payment), credit card minimums, personal loans, and court-ordered obligations like alimony or child support.

Excluded are utilities, phone bills, insurance premiums, groceries, subscriptions, and most everyday spending. This is why DTI can look reasonable while your budget feels tight — it deliberately measures debt obligations, not cost of living.

Why it uses gross income

DTI is calculated before taxes and deductions. Your actual take-home from $6,000 gross might be closer to $4,500, which makes that $2,250 in debt payments roughly 50% of what you really receive rather than 37.5%.

Lenders standardize on gross because it's verifiable and comparable across borrowers. For your own planning, running the same figures against take-home pay gives a more honest picture of the pressure.

Ways to improve it

• Pay off a small loan entirely. Eliminating a $350 car payment helps far more than reducing a large balance without removing its payment.
• Avoid new debt before applying. Financing a car weeks before a mortgage application can undo months of preparation.
• Document all income. Bonuses, commissions, and side income often count if there's a consistent history.
• Refinance to a longer term to lower a payment — this improves DTI while usually increasing total interest, so it's a qualification tactic rather than a savings one.

Note that the third and fourth points work on the ratio rather than your actual financial health. DTI is a gate to get through, not a measure of whether borrowing is wise.

What this calculator doesn't include

It computes the ratio from figures you enter. It doesn't know how a specific lender treats deferred student loans, variable income, or self-employment, and it doesn't account for credit score, reserves, or loan program differences — all of which affect approval alongside DTI. Different programs also calculate qualifying income differently, particularly for self-employed borrowers.