Debt-to-income calculator

What the three debt-to-income ratios show

Debt-to-income is the ratio lenders lean on most heavily when deciding how much you can borrow, but the number a lender uses and the number your household actually feels can be very different. This calculator shows both, plus a third ratio that adds the costs a lender's formula typically leaves out.

Who should use this calculator

Use it before applying, to understand roughly where you stand relative to common lender thresholds, or after getting a pre-approval, to see whether the approved payment still fits once HOA, maintenance, and utilities are added back in. It is a planning tool, not a substitute for your lender's actual underwriting calculation.

What each input means

• Gross monthly income — household income before taxes, the denominator for every ratio here.
• Lender housing payment — the PITI (and PMI, if any) figure a lender would use for the proposed home.
• Other monthly debts — recurring obligations such as car loans, student loans, and minimum credit-card payments that a lender counts.
• HOA outside payment, maintenance reserve, and utilities — real household costs that most lender DTI calculations do not include.

How the calculation works

Housing DTI divides the lender-style housing payment by gross monthly income. Total lender-style DTI adds recurring monthly debts before dividing by income. The separate real-life burden ratio also includes the HOA, maintenance reserve, and utilities you enter. That third ratio is a household-planning view, not a lender underwriting standard.

A worked example, using the figures already loaded above

$2,500 of housing expense plus $700 of other debt on $8,000 of gross monthly income produces a 31.25% housing DTI and a 40% back-end (total lender-style) ratio. Adding the default $150 HOA, $400 maintenance reserve, and $300 utilities — $850 more — brings the broader real-life burden ratio to about 50.63% of gross income. The difference does not prove the loan is affordable or unaffordable; it exposes costs that a qualification ratio may not show.

How to interpret the result

If the gap between the back-end ratio and the real-life ratio is large, as in the example above, a lender may approve a payment that leaves little room once HOA, maintenance, and utilities are actually paid. A smaller gap means the lender's number and your household's real cost roughly agree. Neither ratio alone tells you whether to proceed — read them together with your own budget.

What this calculator does not include

• Your specific lender's qualifying rules — some loan programs allow higher DTI ceilings with compensating factors like reserves or credit history.
• Income types lenders may treat differently, such as bonus, self-employment, or rental income.
• Any actual underwriting decision, rate, or approval.

Why the result is an estimate

These are three ratios computed from numbers you typed in; none of it reflects an actual lender's underwriting system, which may define qualifying income and debt differently. Use it to understand the shape of your finances, then confirm the real ratio with your lender.

Common mistakes to avoid

• Using gross monthly income only if you want a lender-style comparison — using net (after-tax) income instead will understate every ratio.
• Leaving out debts that will continue after closing, such as a car loan or student loan in deferment.
• Replace every example with figures from your documents and household budget before relying on the result.
• Treating the "real-life burden ratio" as a number a lender is applying — it is a household-planning view, not their standard.

Related guides and calculators

• Questions to ask a lender — confirm how your lender actually defines and calculates DTI.
• Affordability calculator — turn a DTI ceiling into a maximum home price.
• True Monthly Home Cost calculator — see the full monthly cost this ratio is built from.

Lenders may treat income, student loans, leases, alimony, credit obligations, and proposed housing costs differently. Confirm qualification with the lender before relying on a ratio.