What is debt-to-income ratio (DTI)?

DTI compares your monthly debt payments to your gross monthly income. The front-end ratio (housing ratio) compares housing expenses to income. The back-end ratio compares all monthly debt payments—including housing—to income. Lenders use DTI to help assess repayment capacity.

What is the 28/36 rule?

A common planning guideline is a 28% front-end ratio (housing) and 36% back-end ratio (total debt), both measured against gross income. Actual loan programs and lender overlays differ—some borrowers qualify above these benchmarks depending on compensating factors and program rules.

Should I use gross or net income?

Lenders typically use gross monthly income for DTI calculations (with adjustments for variable income). This calculator uses gross income. Your take-home pay is different from gross income.

Which debts count in DTI?

Commonly included items are monthly housing payments, auto loans, student loans, minimum credit card payments, and other installment obligations. Exact treatment depends on the credit report and lender guidelines—some debts may be omitted or calculated differently.

How high can DTI be for a mortgage?

It depends on the loan type and underwriting. A common reference is a 43% back-end DTI ceiling for many qualified mortgages, but exceptions exist. Always verify with your loan officer for your loan program and profile.

Does this calculator guarantee approval?

No. This tool produces an illustrative estimate for education. Approval depends on credit score, assets, employment history, reserves, and property details—not DTI alone.

How are credit card minimums counted?

Many lenders use minimum payments as shown on credit reports. Your lender may apply different rules for paid-off accounts or authorized-user accounts.

How can I improve my DTI?

Common strategies include paying down revolving balances to lower minimum payments, avoiding new debt before applying, increasing income (documented), or choosing a lower housing payment. Results vary by lender and timing.

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Mortgage & Credit

Debt-to-Income Ratio Calculator - Front-End & Back-End DTI Calculator

Free DTI calculator for comparing monthly debts to gross monthly income. See front-end (housing) and back-end (total debt) ratios—illustrative for planning, not a lender decision.

Last updated: April 18, 2026

Front-end housing ratio

Back-end total debt ratio

Income less debt (pre-tax) snapshot

Need a custom calculator for your lending site? Get a Quote

Debt-to-Income Ratio

Front-end and back-end DTI from gross income and monthly debts

Gross Monthly Income ($)

Before tax—match what your lender uses when possible

Monthly Housing (rent or P&I + escrow) ($)

Auto loan(s) ($/mo)

Student loans ($/mo)

Credit card minimums ($/mo)

Other monthly debt ($/mo)

Include minimum payments on installment and revolving debt as your lender would count them.

DTI Results

Front-end

27.5%

Housing ÷ income

Back-end

40.0%

All debts ÷ income

Total monthly debt payments$3,200

Income less debt (pre-tax)$4,800

Back-end often discussed up to ~43% for some mortgages (illustrative)

Notes

•Back-end ratio (all debts ÷ income) is about 40.0%. Many conventional workflows reference ~36% for total debt excluding the mortgage “stretch” cases.
•DTI uses gross income before taxes; lenders may use different income definitions and debt treatments.

Debt-to-Income Ratio Calculator Uses

Mortgage readiness

See housing vs income

Front-end

Housing ÷ income

Often paired with the 28% planning benchmark.

Total obligations

Back-end DTI

All debts

÷ income

Includes auto, student, cards, and other monthly payments.

What-if

Pay down debt

Sensitivity

Lower minimums

Test how smaller card minimums change back-end DTI.

Gross income basis

Matches common lender math

Before tax

Gross monthly

Align inputs with pay stubs and lender documentation.

Remaining cash flow

Pre-tax remainder

Income − debt

Not net pay

Taxes and living expenses still come out of gross income.

Education only

Not a credit decision

Disclaimer

Illustrative

Always confirm with a licensed mortgage professional.

Quick Example Result

Default scenario: $8,000/mo gross income, $2,200 housing, $1,000 in other monthly debts:

Front-end

~27.5%

Back-end

~40.0%

How Our Debt-to-Income Ratio Calculator Works

We divide your monthly housing payment by gross monthly income for the front-end ratio. We sum all listed monthly debts (housing, auto, student loans, credit card minimums, and other debt) and divide by gross income for the back-end ratio. We also show income minus total monthly debt payments as a simple pre-tax remainder.

Formulas

Front-end DTI = (housing ÷ gross monthly income) × 100Back-end DTI = (all monthly debts ÷ gross monthly income) × 100Remainder = gross income − sum of monthly debts

Lenders may use different definitions (e.g., PITI, HOA, excluded debts). Match your inputs to your underwriting file when possible.

28/36 guideline (planning)

A common starting point—not a universal approval rule

Sources & references

CFPB — Owning a Home / mortgage processEducational context on how lenders evaluate affordability
Your loan officer — program-specific DTI limitsFHA, VA, USDA, and conventional overlays vary

Pair with our borrowing power calculator for another affordability angle.

Get a Custom Calculator

Example: Mid-range income

Walk-through

With $8,000 gross income and $3,200 in total monthly debt payments, back-end DTI is about 40.0% in the default example—front-end about 27.5%.

Change housing or debt payments to see how sensitive DTI is to paying down revolving balances or choosing a lower housing payment.

Not financial advice; for education and estimation only.

Frequently Asked Questions

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Mortgage & Credit

Debt-to-Income Ratio Calculator - Front-End & Back-End DTI Calculator

Free DTI calculator for comparing monthly debts to gross monthly income. See front-end (housing) and back-end (total debt) ratios—illustrative for planning, not a lender decision.

Last updated: April 18, 2026

Front-end housing ratio

Back-end total debt ratio

Income less debt (pre-tax) snapshot

Need a custom calculator for your lending site? Get a Quote

Debt-to-Income Ratio

Front-end and back-end DTI from gross income and monthly debts

Gross Monthly Income ($)

Before tax—match what your lender uses when possible

Monthly Housing (rent or P&I + escrow) ($)

Auto loan(s) ($/mo)

Student loans ($/mo)

Credit card minimums ($/mo)

Other monthly debt ($/mo)

Include minimum payments on installment and revolving debt as your lender would count them.

DTI Results

Front-end

27.5%

Housing ÷ income

Back-end

40.0%

All debts ÷ income

Total monthly debt payments$3,200

Income less debt (pre-tax)$4,800

Back-end often discussed up to ~43% for some mortgages (illustrative)

Notes

•Back-end ratio (all debts ÷ income) is about 40.0%. Many conventional workflows reference ~36% for total debt excluding the mortgage “stretch” cases.
•DTI uses gross income before taxes; lenders may use different income definitions and debt treatments.

Debt-to-Income Ratio Calculator Uses

Mortgage readiness

See housing vs income

Front-end

Housing ÷ income

Often paired with the 28% planning benchmark.

Total obligations

Back-end DTI

All debts

÷ income

Includes auto, student, cards, and other monthly payments.

What-if

Pay down debt

Sensitivity

Lower minimums

Test how smaller card minimums change back-end DTI.

Gross income basis

Matches common lender math

Before tax

Gross monthly

Align inputs with pay stubs and lender documentation.

Remaining cash flow

Pre-tax remainder

Income − debt

Not net pay

Taxes and living expenses still come out of gross income.

Education only

Not a credit decision

Disclaimer

Illustrative

Always confirm with a licensed mortgage professional.

Quick Example Result

Default scenario: $8,000/mo gross income, $2,200 housing, $1,000 in other monthly debts:

Front-end

~27.5%

Back-end

~40.0%

How Our Debt-to-Income Ratio Calculator Works

Formulas

Front-end DTI = (housing ÷ gross monthly income) × 100Back-end DTI = (all monthly debts ÷ gross monthly income) × 100Remainder = gross income − sum of monthly debts

Lenders may use different definitions (e.g., PITI, HOA, excluded debts). Match your inputs to your underwriting file when possible.

28/36 guideline (planning)

A common starting point—not a universal approval rule

Sources & references

CFPB — Owning a Home / mortgage processEducational context on how lenders evaluate affordability
Your loan officer — program-specific DTI limitsFHA, VA, USDA, and conventional overlays vary

Pair with our borrowing power calculator for another affordability angle.

Get a Custom Calculator