Calculate your debt-to-income ratio and see if you qualify for a mortgage. Instant front-end and back-end DTI with lender benchmarks.
Debt-to-income ratio (DTI) is one of the most important factors lenders evaluate when approving loans. This DTI calculator shows both your front-end ratio (housing costs only) and back-end ratio (all debts), with instant feedback on where you stand relative to lender standards. Check your DTI before applying for a mortgage so you know whether to pay down debts first or if you are already in a strong position to qualify. All calculations run in your browser — your data never leaves your device.
Debt-to-income ratio is calculated by dividing your total monthly debt obligations by your gross monthly income and expressing the result as a percentage. There are two versions that lenders evaluate separately:
Front-End DTI = Monthly Housing Costs ÷ Gross Monthly Income
Back-End DTI = All Monthly Debt Payments ÷ Gross Monthly Income
Housing costs for the front-end ratio include your proposed mortgage P&I, property taxes, homeowner's insurance, PMI (if down payment is under 20%), and any HOA dues. Back-end DTI adds all other recurring debt obligations: car loans, student loan payments, credit card minimum payments, personal loans, alimony, and child support. The calculator shows both ratios simultaneously with color-coded status (green/yellow/red) against standard lender thresholds.
Tom earns $6,500/month gross. He is applying for a mortgage with a $1,650/month PITI payment (including taxes and insurance). He also has a $380/month car payment, $210/month student loan minimum, and $75/month credit card minimum.
Front-end DTI: $1,650 / $6,500 = 25.4% ✓ (under 28% limit — good).
Back-end DTI: ($1,650 + $380 + $210 + $75) / $6,500 = $2,315 / $6,500 = 35.6% ✓ (just under 36% limit — acceptable).
Tom qualifies under the 36% guideline, but barely. If his target home were $30,000 more expensive (adding $190/month to PITI), his back-end DTI would jump to 38.5% — still approvable for most conventional loans up to 43–45%, but tighter. If Tom paid off the $75/month credit card minimum before applying, his back-end DTI would drop to 34.4%, giving him a comfortable margin and potentially improving his loan offer.
A DTI ratio below 36% is generally considered excellent by lenders. Ratios between 36%–43% are acceptable for most conventional mortgages. Above 43% is considered high-risk by most traditional lenders and makes approval difficult, though FHA loans allow up to 50% DTI with compensating factors. Under 20% DTI is ideal and gives you maximum flexibility and the best loan terms. Our DTI calculator shows both your front-end and back-end ratios with a clear status indicator so you can see exactly where you stand before applying for any loan.
Lenders calculate DTI by dividing your total monthly debt obligations by your gross monthly income (before taxes and deductions). They use two versions: the front-end ratio (housing costs only divided by income) and the back-end ratio (all monthly debts divided by income). Lenders use your full minimum required payment on each debt, not how much you choose to pay. For credit cards, they use the minimum payment shown on your statement. For revolving lines of credit with no balance, most lenders count $0 since there is no required payment.
Front-end DTI (also called the housing ratio) includes only your proposed housing costs: principal, interest, property taxes, homeowner's insurance, PMI if applicable, and HOA fees. Lenders want this under 28% for conventional loans. Back-end DTI (the total debt ratio) adds all other monthly debt payments to your housing costs: car loans, student loans, credit card minimums, personal loans, alimony, and child support. Lenders want this under 36%–43%. Both ratios matter — a borrower can have a good front-end DTI but be disqualified due to high back-end DTI from other debts.
Getting approved with high DTI (above 43%) becomes increasingly difficult with conventional lenders but is not impossible. FHA loans allow back-end DTI up to 50% with compensating factors such as a credit score above 720, a large down payment (10%+), significant cash reserves (3–6 months of mortgage payments), or a history of low housing costs relative to income. VA loans and USDA loans also have more flexibility around DTI. Some portfolio lenders — banks that hold loans in-house rather than selling them — apply their own underwriting standards and may approve higher DTIs for otherwise strong borrowers.
There are two ways to lower DTI: reduce your monthly debt payments or increase your gross income. To reduce debts: pay off credit card balances entirely (minimum payments disappear), pay off or pay down small loans, refinance existing debt to lower payments, or avoid taking on any new debt before applying. To increase income: document all income sources (rental income, freelance, bonuses, alimony received), ask for a raise, take on part-time work, or wait until a scheduled raise takes effect. Even modest income increases have a meaningful impact on DTI percentage. For example, a $300/month income increase on a base of $6,000/month shifts DTI by 5 percentage points.