finance calculator

Debt-to-Income Ratio Calculator

Calculate your front-end and back-end debt-to-income ratio to see how mortgage lenders will evaluate your monthly debt against your income.

Debt-to-income (DTI) ratio is total monthly debt payments divided by gross monthly income, expressed as a percentage. Mortgage lenders generally consider 36% or below back-end DTI healthy, with most conventional loans capping around 43%. A household with $7,500 gross monthly income and $2,700 in total monthly debt payments has a 36% back-end DTI.

Formula Verified by Dr. Elizabeth Vance, PhD

Quick actions: Save inputs, view saved runs, print, share, or export results

Saved Runs

Inputs

Gross monthly income$

Housing payment$

Auto loan payment$

Student loan payment$

Credit card min. payments$

Other monthly debt$

Results

Back-end DTI (total debt)

36.0%

Front-end DTI (housing only)24.0%

Total monthly debt$2,700

CategoryHealthy

Room to 36% back-end DTI$0

Tip

Save this page and re-check your DTI before applying for a mortgage, auto loan, or any major new debt.

Formula

Debt-to-income formula

Back-End DTI = Total Monthly Debt ÷ Gross Monthly Income × 100. Front-End DTI = Housing Payment ÷ Gross Monthly Income × 100.

Lenders use back-end DTI (all debt) as the primary qualifying metric, with front-end DTI (housing only) as a secondary check.

Step by step

How the calculation works

1Enter gross monthly income before taxes and deductions.
2Enter your housing payment (rent or mortgage, including taxes and insurance if escrowed).
3Enter every other required monthly debt payment: auto loans, student loans, credit card minimums, and other installment debt.
4Compare front-end and back-end DTI against the 28/36 lending guideline.

Example

DTI example

With $7,500 gross monthly income, an $1,800 housing payment, and $900 in other monthly debt, total monthly debt is $2,700. Back-end DTI is 36%, and front-end DTI is 24% — a healthy ratio by most conventional lending standards.

Related guides

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Guide

Home Affordability: Budget, Formula, and Calculator

Estimate a home-price range from income, debt, down payment, rate, taxes, and insurance, then test costs the DTC model does not include.

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Template

Free Checkbook Register Excel Template

Confirm your real monthly cash flow before estimating how much additional debt you can safely carry.

Debt-to-Income Ratio Calculator

Calculate your front-end and back-end debt-to-income ratio to see how mortgage lenders will evaluate your monthly debt against your income.

Formula Verified by Dr. Elizabeth Vance, PhD

How to understand and use this calculator

Quick Answer: What Is Debt-to-Income Ratio?

Debt-to-income ratio (DTI) is your total monthly debt payments divided by your gross monthly income, expressed as a percentage. Lenders calculate two versions: front-end DTI (housing payment only, divided by income) and back-end DTI (every monthly debt payment, divided by income). Back-end DTI is the number that actually drives most lending decisions.

A household earning $7,500 a month with an $1,800 housing payment and $900 in other monthly debt has a 24% front-end DTI and a 36% back-end DTI — right at the traditional "good" threshold most conventional lenders look for.

How to Use This Calculator

Enter your gross monthly income (before taxes), your housing payment, and every other required monthly debt payment: auto loans, student loans, minimum credit card payments, and any other installment debt. Do not include groceries, utilities, subscriptions, or other discretionary spending — DTI only counts debt obligations, not general living expenses.

The calculator divides your housing payment alone by income for front-end DTI, then divides all monthly debt combined by income for back-end DTI, and flags which lending category your back-end ratio falls into.

The Formula This Calculator Uses

$$\text{Front-End DTI} = \dfrac{\text{Housing Payment}}{\text{Gross Monthly Income}} × 100$$

$$\text{Back-End DTI} = \dfrac{\text{Total Monthly Debt}}{\text{Gross Monthly Income}} × 100$$

$$\text{Total Monthly Debt} = \text{Housing} + \text{Auto} + \text{Student Loans} + \text{Credit Cards} + \text{Other Debt}$$

Worked Example: A Qualifying Ratio

$7,500 gross monthly income, $1,800 housing payment, $450 auto loan, $300 student loan, $150 credit card minimums, and no other debt.

Total monthly debt: $1,800 + $450 + $300 + $150 + $0 = $2,700.

Front-end DTI: $1,800 ÷ $7,500 × 100 = 24%.

Back-end DTI: $2,700 ÷ $7,500 × 100 = 36% — right at the widely used "healthy" ceiling, and this household has $0 of additional room before crossing it.

Category: Healthy.

Second Worked Example: A Stretched Budget

$3,200 gross monthly income, $1,100 housing payment, $320 auto loan, $210 student loan, $180 credit card minimums, and $50 in other debt.

Total monthly debt: $1,100 + $320 + $210 + $180 + $50 = $1,860.

Front-end DTI: $1,100 ÷ $3,200 × 100 ≈ 34.4%.

Back-end DTI: $1,860 ÷ $3,200 × 100 ≈ 58.1%.

Category: High Risk. At this level, most conventional and FHA lenders would decline the application or require significant compensating factors (a large down payment, substantial cash reserves, or an excellent credit score) before approving new housing debt.

How Lenders Interpret DTI

There's no single universal cutoff, but widely used industry guidelines cluster around a few thresholds: 36% or below back-end DTI is generally considered healthy and qualifies for most conventional mortgage products; 36–43% is manageable and still often qualifies, especially with a strong credit profile; above 43% is stretched, the ceiling most conventional Qualified Mortgages use; and FHA loans allow back-end DTI up to roughly 50% with strong compensating factors, though approval becomes harder above 43% across the board.

Front-end DTI has a looser rule of thumb — 28% or below is the traditional target — but back-end DTI is the number that actually drives most modern underwriting decisions, since it captures your full monthly debt load rather than housing costs alone.

Front-End vs. Back-End: Why Both Numbers Matter

Front-end DTI answers "can I afford this specific housing payment relative to my income." Back-end DTI answers the more complete question: "can I afford this housing payment given everything else I already owe." Two applicants with identical incomes and identical desired mortgage payments can have very different back-end DTIs if one carries student loans and a car payment and the other doesn't — and it's the back-end number that typically decides the outcome.

This is also why paying down a car loan or a credit card balance before applying for a mortgage can matter more than saving for a larger down payment: it directly lowers the back-end ratio lenders weigh most heavily.

How to Lower Your DTI Before Applying for a Mortgage

Two levers exist, and both are worth pursuing together: pay down or pay off existing debt (each eliminated monthly payment drops directly out of the back-end calculation), and increase gross income (a raise, a second income source, or documented overtime/bonus income that a lender will count). Avoid opening new credit accounts, financing a car, or taking on any other new monthly obligation in the months before a mortgage application — even a small new payment can push a borderline ratio over a lender's cutoff.

What This Ratio Doesn't Capture

DTI measures debt obligations against gross income, but it doesn't account for taxes, healthcare costs, childcare, or other significant recurring expenses that aren't classified as debt — two households with identical DTI can have very different amounts of real discretionary income left over each month. It also uses gross (pre-tax) income, which overstates what's actually available to spend compared to net take-home pay. Use this ratio as one input among several, not a complete affordability picture.

Related Calculators

DTI is the core qualifying metric behind mortgage approval — see how it translates into an actual purchase price with the home affordability calculator and estimate a specific monthly payment with the mortgage calculator. If credit card debt is driving your ratio up, compare payoff timelines with the credit card payoff calculator or the broader debt payoff calculator.

Related concepts

Front-end DTI

Housing payment only, divided by gross monthly income — a secondary check most lenders use alongside back-end DTI.

Back-end DTI

All monthly debt obligations divided by gross monthly income — the primary ratio most mortgage lenders qualify borrowers against.

Qualified Mortgage (QM)

A category of conventional mortgage with borrower-protection features, generally associated with a back-end DTI ceiling around 43%.

Compensating factors

Strengths in an application — large down payment, high credit score, significant cash reserves — that can offset a higher-than-ideal DTI.

Frequently Asked Questions

What is a good debt-to-income ratio?+

36% or below back-end DTI is generally considered healthy by conventional mortgage lenders. 36–43% is often still workable, and above 43% becomes difficult without strong compensating factors like a large down payment or high credit score.

What's the difference between front-end and back-end DTI?+

Front-end DTI only counts your housing payment divided by income. Back-end DTI counts all monthly debt — housing, auto, student loans, credit cards, and other obligations — divided by income. Back-end DTI is the number most lenders weigh most heavily.

Does DTI use gross or net income?+

Gross (pre-tax) monthly income. This is standard lending practice, but it means your DTI understates how tight your budget might feel compared to your actual take-home pay.

What counts as debt for DTI purposes?+

Recurring debt obligations: mortgage or rent, auto loans, student loans, minimum credit card payments, and other installment loans. Utilities, groceries, insurance premiums, and subscriptions are not counted, even though they're real monthly expenses.

What's the maximum DTI for an FHA loan?+

FHA loans can allow back-end DTI up to roughly 50% with strong compensating factors, higher than the roughly 43% ceiling typical of conventional Qualified Mortgages, though approval gets progressively harder above 43% regardless of loan type.

How can I lower my DTI quickly?+

Pay off or pay down existing debt (each payment you eliminate lowers the ratio directly), avoid taking on any new monthly obligations before applying for credit, and increase documented income where possible.

Does my spouse's debt count toward my DTI?+

Only if you're applying jointly. On a joint mortgage application, lenders typically combine both incomes and both sets of debt obligations to calculate a household DTI.

Is DTI the same as my credit utilization ratio?+

No. Credit utilization is how much of your available credit card limit you're using, and it affects your credit score. DTI compares your monthly debt payments to your income, and it's used for loan approval and sizing, not credit scoring.

Should I include rent I'm paying now if I'm buying a home?+

No — use the new estimated housing payment (mortgage principal, interest, taxes, and insurance) you're applying for, not your current rent, since that's the payment the lender is actually evaluating.

How the calculation works

1Enter gross monthly income before taxes and deductions.

2Enter your housing payment (rent or mortgage, including taxes and insurance if escrowed).

3Enter every other required monthly debt payment: auto loans, student loans, credit card minimums, and other installment debt.

4Compare front-end and back-end DTI against the 28/36 lending guideline.

How to understand and use this calculator

Quick Answer: What Is Debt-to-Income Ratio?

How to Use This Calculator

The Formula This Calculator Uses

$$\text{Front-End DTI} = \dfrac{\text{Housing Payment}}{\text{Gross Monthly Income}} × 100$$

$$\text{Back-End DTI} = \dfrac{\text{Total Monthly Debt}}{\text{Gross Monthly Income}} × 100$$

$$\text{Total Monthly Debt} = \text{Housing} + \text{Auto} + \text{Student Loans} + \text{Credit Cards} + \text{Other Debt}$$

Worked Example: A Qualifying Ratio

$7,500 gross monthly income, $1,800 housing payment, $450 auto loan, $300 student loan, $150 credit card minimums, and no other debt.

Total monthly debt: $1,800 + $450 + $300 + $150 + $0 = $2,700.

Front-end DTI: $1,800 ÷ $7,500 × 100 = 24%.

Back-end DTI: $2,700 ÷ $7,500 × 100 = 36% — right at the widely used "healthy" ceiling, and this household has $0 of additional room before crossing it.

Category: Healthy.

Second Worked Example: A Stretched Budget

$3,200 gross monthly income, $1,100 housing payment, $320 auto loan, $210 student loan, $180 credit card minimums, and $50 in other debt.

Total monthly debt: $1,100 + $320 + $210 + $180 + $50 = $1,860.

Front-end DTI: $1,100 ÷ $3,200 × 100 ≈ 34.4%.

Back-end DTI: $1,860 ÷ $3,200 × 100 ≈ 58.1%.

How Lenders Interpret DTI

Front-End vs. Back-End: Why Both Numbers Matter

How to Lower Your DTI Before Applying for a Mortgage

What This Ratio Doesn't Capture

Related Calculators

Related concepts

Front-end DTI

Housing payment only, divided by gross monthly income — a secondary check most lenders use alongside back-end DTI.

Back-end DTI

All monthly debt obligations divided by gross monthly income — the primary ratio most mortgage lenders qualify borrowers against.

Qualified Mortgage (QM)

A category of conventional mortgage with borrower-protection features, generally associated with a back-end DTI ceiling around 43%.

Compensating factors

Strengths in an application — large down payment, high credit score, significant cash reserves — that can offset a higher-than-ideal DTI.

Frequently Asked Questions

What is a good debt-to-income ratio?+

What's the difference between front-end and back-end DTI?+

Does DTI use gross or net income?+

Gross (pre-tax) monthly income. This is standard lending practice, but it means your DTI understates how tight your budget might feel compared to your actual take-home pay.

What counts as debt for DTI purposes?+

What's the maximum DTI for an FHA loan?+

How can I lower my DTI quickly?+

Does my spouse's debt count toward my DTI?+

Only if you're applying jointly. On a joint mortgage application, lenders typically combine both incomes and both sets of debt obligations to calculate a household DTI.

Is DTI the same as my credit utilization ratio?+

Should I include rent I'm paying now if I'm buying a home?+

Debt-to-Income Ratio Calculator

Inputs

Results

Debt-to-income formula

How the calculation works

DTI example

Learn more about this calculation

Home Affordability: Budget, Formula, and Calculator

How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide

Free Checkbook Register Excel Template

Debt-to-Income Ratio Calculator

Inputs

Results

Key output metrics

Income vs. total monthly debt

Debt breakdown

How to understand and use this calculator

Quick Answer: What Is Debt-to-Income Ratio?

How to Use This Calculator

The Formula This Calculator Uses

Worked Example: A Qualifying Ratio

Second Worked Example: A Stretched Budget

How Lenders Interpret DTI

Front-End vs. Back-End: Why Both Numbers Matter

How to Lower Your DTI Before Applying for a Mortgage

What This Ratio Doesn't Capture

Related Calculators

Related concepts

Frequently Asked Questions

Debt-to-income formula

How the calculation works

DTI example

Learn more about this calculation

Home Affordability: Budget, Formula, and Calculator

How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide

Free Checkbook Register Excel Template

Key output metrics

Income vs. total monthly debt

Debt breakdown

How to understand and use this calculator

Quick Answer: What Is Debt-to-Income Ratio?

How to Use This Calculator

The Formula This Calculator Uses

Worked Example: A Qualifying Ratio

Second Worked Example: A Stretched Budget

How Lenders Interpret DTI

Front-End vs. Back-End: Why Both Numbers Matter

How to Lower Your DTI Before Applying for a Mortgage

What This Ratio Doesn't Capture

Related Calculators

Related concepts

Frequently Asked Questions