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This calculator adds up your monthly debt payments (housing, car loans, credit card minimums, student loans, and other debts), then divides the total by your gross monthly income and multiplies by 100. The result is your back-end debt-to-income ratio, the figure most mortgage lenders use. It also estimates the maximum monthly debt you could carry at the 43% Qualified Mortgage ceiling and rates your lender readiness.
Your debt-to-income ratio answers one question: what share of your monthly income is already committed to debt? Divide your total monthly debt payments by your gross monthly income (income before taxes and deductions), then multiply by 100. This is your back-end DTI, the number most lenders quote when they say just "DTI". Always use gross income, not take-home pay, because that is the industry standard lenders compare you against.
Take a borrower with a gross monthly income of $7,000. Their monthly debts are: housing (rent or mortgage) $1,500, car loan $350, credit card minimums $120, student loans $200, and no other debts, for a total of $2,170. Divide $2,170 by $7,000 and multiply by 100 to get a DTI of 31.0%, a Good rating. At the 43% Qualified Mortgage ceiling, this borrower could carry up to $3,010 in monthly debt, leaving about $840 of headroom for a larger housing payment.
Mortgage underwriters look at two ratios. Front-end DTI (also called the housing ratio) is your housing costs alone divided by gross income: mortgage principal and interest plus property taxes, homeowners insurance, and HOA dues (often called PITI). Conventional lenders prefer it below 28%. Back-end DTI adds every other monthly debt: car loans, credit card minimums, student loans, personal loans, child support, and alimony. The traditional rule of thumb is 28/36: housing below 28% of gross income, total debts below 36%. When lenders say "DTI" without a qualifier, they almost always mean the back-end ratio, and that is what this calculator computes.
Lenders treat the 43% back-end DTI line seriously: the Consumer Financial Protection Bureau's Qualified Mortgage rule caps back-end DTI at 43% for loans to keep their strongest legal protections, so conventional lenders anchor their guidelines there. Typical thresholds by loan type: conventional mortgages target 36% back-end (up to 45-50% with compensating factors like strong credit or large reserves), FHA loans allow up to about 50% with compensating factors, VA loans recommend 41% but can go higher, and USDA loans sit near 41-44%. Non-mortgage credit is looser: personal loan lenders often approve up to 40-50% DTI, and auto lenders are more flexible since the vehicle is collateral. If you are applying for a mortgage, note that lenders use your proposed mortgage payment, not your current rent, in the housing portion of the calculation. These figures are estimates for planning purposes, not professional financial advice.
You have two levers: shrink monthly payments or grow documented income. On the debt side, target balances whose payments disappear completely: paying off a $4,000 credit card might remove $100-$125 of minimum payments each month, while paying down one large installment loan frees up its whole payment. Two popular payoff orders are the debt avalanche (attack the highest interest rate first to save the most money) and the debt snowball (clear the smallest balance first for quick wins that build momentum). Avoid new debt in the 6-12 months before a mortgage application, since lenders pull credit right before closing. On the income side, a raise counts immediately; freelance or bonus income usually needs a two-year documented history; and adding a co-borrower with income lowers the ratio through a bigger denominator. Refinance existing loans when rates are lower. Plan ahead: it typically takes one to two months for payoffs and income changes to register on your credit reports. A lump-sum payoff can improve your ratio quickly once the lender reports it, but most borrowers should plan on weeks to months of steady progress.
Most lenders consider below 20% excellent and 20-35% good, with the best rates going to the lowest ratios. 36-43% is acceptable for many loans, including most mortgages. Above 43% you sit at or over the Qualified Mortgage ceiling, which limits your loan options and likely raises your rate.
To calculate your DTI yourself, add up every recurring monthly debt payment (housing, car loans, credit card minimums, student loans, personal loans, child support), divide that total by your gross monthly income before taxes, and multiply by 100. Your ratio is calculated as a percentage, which is the form lenders compare against their thresholds. Example: $2,170 in monthly debts divided by $7,000 income equals 0.31, times 100 equals 31% DTI.
Does DTI affect your credit score? Not directly. FICO and VantageScore do not include DTI, because your credit report has no income data. However, the same debts that drive DTI up also hurt your score through credit utilization and payment history. Lenders weigh credit score and DTI separately, so a high score cannot fully rescue a problematic DTI.
Always use gross income: your total monthly income before taxes and other deductions. Salary divided by 12 for annual pay; hourly wage times weekly hours times 4.33; for variable income, average the last three to six months. If you used take-home pay instead, your DTI would look artificially high.
Include all recurring debt obligations: rent or mortgage, car loans, minimum credit card payments, student loans, personal loans, child support or alimony, and any other installment or revolving minimums. Do NOT include utilities, groceries, insurance premiums, phone bills, taxes, or savings, unless insurance and taxes are part of your mortgage payment (PITI). Every debt on the included list counts toward your total; everything else stays out of the DTI calculation.
Sometimes, but options narrow. FHA loans can approve up to about 50% DTI with compensating factors such as strong credit, large reserves, or a big down payment, and VA loans have no hard ceiling. Expect higher rates and more documentation. If your ratio is near a cutoff, paying off one installment loan before applying can make the difference.
It is a rule of thumb for homebuying: keep your monthly mortgage payment (housing) below 28% of gross monthly income and your total monthly debts below 36%. These are your front-end and back-end ratios. Many lenders approve above 36% for qualified borrowers, but 28/36 remains a useful affordability target.