Your debt-to-income ratio — DTI for short — is the single number lenders look at the most before approving a mortgage, an auto loan, or a refinance. It compares how much you owe every month to how much you actually earn, and it answers the question every underwriter asks: can this borrower comfortably carry another payment?
This DTI calculator takes three quick figures — your annual gross salary, your monthly housing cost, and your other monthly debts — and instantly shows both your front-end (housing-only) and back-end (all-debts) ratios. Because you enter your salary as a yearly number rather than a monthly one, you can type straight off your W-2 or pay stub annualized line without doing division in your head. Adjust any field and the result card updates immediately.
How to Use
- Enter your Annual Gross Income. This is your household pay before taxes and deductions — the number on your W-2, plus bonuses, overtime, alimony, and any steady side income. Do not use your take-home pay; DTI is always calculated against gross.
- Set your Monthly Housing Payment. If you are buying, this is the mortgage principal and interest plus property tax, homeowner's insurance, and HOA dues (often called PITI). If you rent, enter your rent.
- Add your Other Monthly Debts as one combined lump sum: student loan payments, car loans or leases, credit card minimums, personal loans, alimony, and child support. Use minimums, not full balances — DTI counts what you are contractually obligated to pay each month.
- Read the result card. The back-end ratio is your headline DTI — total monthly debt divided by gross monthly income. The front-end ratio shows housing alone, and the 43% QM limit tells you the maximum monthly debt load a qualified mortgage will usually allow.
The calculator first converts your annual salary into a monthly gross figure by dividing by 12, then divides each debt total by that monthly income and multiplies by 100. That is the entire formula — no hidden fees, no amortization tables.
Front-End vs. Back-End DTI
Lenders watch two ratios, and this calculator reports both:
- Front-end ratio (housing ratio) = monthly housing payment ÷ gross monthly income. The traditional benchmark is 28%: housing costs above that strain most budgets, and FHA loans cap it near 31% with compensating factors.
- Back-end ratio (total DTI) = (housing + all other debts) ÷ gross monthly income. This is the number most lenders mean when they say "your DTI." Conventional loans prefer 36% or below; FHA allows up to 43%–57% with strong compensating factors; the qualified mortgage (QM) rule sets a 43% safe-harbor ceiling.
If your back-end ratio is under 20%, lenders see you as very safe. Between 20% and 36% is manageable. Between 36% and 43% is borderline — approvable, but you will get less-favorable rates. Above 43% you are overextended, and most mainstream lenders will not extend new credit until you pay something down.
Examples
Example 1 — The standard buyer. A household earns $60,000 a year gross, carries a $1,500 monthly mortgage (PITI), and pays $800 a month in student loans, a car loan, and credit card minimums combined. Monthly gross income is $60,000 ÷ 12 = $5,000. Total monthly debt is $1,500 + $800 = $2,300. Front-end ratio = $1,500 ÷ $5,000 = 30%. Back-end DTI = $2,300 ÷ $5,000 = 46%. That is just over the 43% QM line, so the calculator flags the file as "Overextended" — the borrower would need to pay down roughly $150 of other debt per month to fall back to 43%.
Example 2 — No other debt. Same $60,000 salary and $1,500 housing payment, but the borrower has no student loans, car payment, or credit card balance. Other debts = $0, so total debt is just $1,500 and back-end DTI = 30%. The front-end and back-end ratios are identical, and the file sails through underwriting comfortably.
Example 3 — High earner, small debt load. A household grosses $1,200,000 a year, pays $5,000 a month in housing, and owes $2,000 a month on other debts. Gross monthly income is $100,000. Back-end DTI = $7,000 ÷ $100,000 = 7%. Even with a jumbo-sized mortgage, the ratio is tiny — debt scale does not matter, only the proportion of income it consumes.
FAQ
What is a good DTI ratio for a mortgage?
A back-end DTI of 36% or below is the traditional sweet spot, with housing alone under 28%. Conventional and FHA loans routinely approve up to 43%, and with strong credit and reserves some programs go higher. Below 20% is excellent; above 43% is considered overextended for most qualified mortgages.
Should I use gross or net income for DTI?
Always gross. Lenders calculate DTI against your pre-tax income, because gross income is stable, documented on your W-2 or tax return, and the same figure they use to verify your ability to repay. Using your take-home pay would understate your ratio and give you a falsely comfortable number.
Does my 401(k) or rent count as debt in DTI?
Rent counts toward the front-end ratio when you are applying for a new mortgage (it shows housing history), and recurring obligations like auto leases, student loans, credit card minimums, alimony, and child support count in the back-end ratio. Savings, 401(k) contributions, gym memberships, and discretionary spending do not count — DTI only captures fixed debt payments.
How can I lower my DTI quickly?
Three levers work: pay off a small loan entirely (the minimum payment disappears from the ratio), consolidate high-interest credit card debt into a personal loan with a lower required minimum, or increase your gross income. Avoid opening new accounts before closing — a new car loan or credit card will push your ratio up on the day the lender re-pulls.
What is the difference between front-end and back-end DTI?
The front-end ratio isolates housing — mortgage or rent divided by gross monthly income. The back-end ratio adds every other recurring debt payment on top of housing. Lenders use the back-end ratio as the primary approval gate, but the front-end ratio still matters because it shows how much of your budget housing alone consumes.
Is DTI the same as credit score?
No. Your credit score measures how reliably you have repaid past debt; DTI measures how much new debt you are trying to take on relative to your income. It is possible to have an 800 credit score and still be denied a loan because your DTI is too high, and possible to have a mid-600s score and be approved because your debt load is light. Lenders weigh both.
Disclaimer
This DTI calculator is provided for informational purposes only and does not constitute financial, lending, or tax advice. Ratios are estimates based on the inputs you enter; actual underwriting decisions depend on your credit score, reserves, property type, loan program, and lender guidelines. The 28%, 36%, and 43% thresholds are common rules of thumb, not universal rules. Always confirm your qualifying ratio and loan options directly with a licensed mortgage lender before applying.