What does the Debt-to-Income Ratio Calculator measure?

It measures front-end DTI (your housing payment as a percentage of gross monthly income) and back-end DTI (housing plus all other recurring debt as a percentage of gross monthly income) — the two ratios most lenders use to gauge affordability.

What is a good back-end DTI ratio?

The calculator rates a back-end DTI at or below 36% as Good, 36–43% as Manageable, and above 43% as High, which mirrors common conventional mortgage-qualifying limits — though every lender's rules differ.

What counts as 'other monthly debts' in the DTI calculator?

Include recurring obligations such as credit card minimums, auto loan payments, student loans, personal loans, and child support or alimony. Everyday expenses like groceries, utilities, or subscriptions are not debt payments and should be left out.

Is the DTI calculator's result the same as what a mortgage lender will use?

It's a close estimate using the standard front-end and back-end formulas, but actual underwriting can weigh income, debts, and exceptions differently. Treat the result as a planning estimate, not a guaranteed qualifying number.

Does the Debt-to-Income Ratio Calculator store or upload my income and debts?

No. Every figure you type is calculated locally in your browser and never leaves your device — nothing is sent to ArrayKit or anywhere else.

Can I use the DTI calculator for a refinance instead of a new mortgage?

Yes. Enter your current income and the proposed new housing payment alongside your other debts to see how a refinance would shift your front-end and back-end DTI.

Debt-to-Income Ratio Calculator Online

Calculate your front-end and back-end debt-to-income (DTI) ratios from your income and monthly debts, entirely on your device.

The Debt-to-Income Ratio Calculator runs entirely in your browser. Your income and debt figures never leave your device. Results are estimates only, not financial advice — confirm actual qualifying figures with a lender or financial professional.

Open the House Affordability Calculator

About Debt-to-Income Ratio Calculator

Debt-to-Income Ratio Calculator turns your gross monthly income, housing payment, and other recurring debts into the two numbers lenders actually look at: front-end DTI (housing only) and back-end DTI (housing plus all other debt). Type in three figures and instantly see both percentages, your total monthly debt load, and a plain-language rating based on common mortgage-qualifying thresholds. It's built for anyone comparing mortgage or refinance offers, budgeting before a big purchase, or just checking how much of their paycheck already goes to debt. Every calculation happens locally in your browser as you type — nothing is uploaded. These figures are estimates only, not financial advice; actual lender guidelines vary and you should confirm numbers with a qualified professional.

Features

Calculates front-end DTI (housing payment ÷ income) and back-end DTI (total debt ÷ income) at once
Updates instantly as you edit income, housing payment, or other debts
Rates your back-end DTI as Good, Manageable, or High against common lender thresholds
Shows total monthly debt alongside both ratio percentages
One-click copy of a plain-text summary of all results
Accepts figures with currency symbols or thousands separators
Clear validation message for zero or negative income
Runs entirely in your browser — your income and debt figures stay on your device

How to use the Debt-to-Income Ratio Calculator

Enter your gross (pre-tax) monthly income
Enter your monthly housing payment (rent or mortgage)
Enter your other monthly debt payments (cards, auto loans, student loans, etc.)
Read the front-end DTI, back-end DTI, and rating that update automatically
Copy the summary to compare offers or share with a lender

Example

Input

$6,000 income, $1,500 housing, $500 debt

Output

Back-end DTI: 33.3% (good)

Housing plus other debt is 33.3% of gross monthly income, within most lenders' comfort zone.

Common errors & troubleshooting

The Debt-to-Income Ratio Calculator shows a validation error instead of a result. — Gross monthly income must be greater than 0 — it's the denominator for both DTI ratios and cannot be zero or negative.
Back-end DTI looks unexpectedly high. — Make sure 'other monthly debts' only includes recurring payments (cards, auto, student loans) and not one-time expenses like groceries or utilities.
Income was entered as an annual salary instead of monthly. — The calculator expects gross monthly income; divide an annual salary by 12 before entering it, or the DTI ratios will read far too low.
Housing payment doesn't match what a lender quoted. — Include taxes and insurance if your lender escrows them into the payment (PITI), since many DTI guidelines are based on the full housing payment, not just principal and interest.

Frequently asked questions

What does the Debt-to-Income Ratio Calculator measure?: It measures front-end DTI (your housing payment as a percentage of gross monthly income) and back-end DTI (housing plus all other recurring debt as a percentage of gross monthly income) — the two ratios most lenders use to gauge affordability.
What is a good back-end DTI ratio?: The calculator rates a back-end DTI at or below 36% as Good, 36–43% as Manageable, and above 43% as High, which mirrors common conventional mortgage-qualifying limits — though every lender's rules differ.
What counts as 'other monthly debts' in the DTI calculator?: Include recurring obligations such as credit card minimums, auto loan payments, student loans, personal loans, and child support or alimony. Everyday expenses like groceries, utilities, or subscriptions are not debt payments and should be left out.
Is the DTI calculator's result the same as what a mortgage lender will use?: It's a close estimate using the standard front-end and back-end formulas, but actual underwriting can weigh income, debts, and exceptions differently. Treat the result as a planning estimate, not a guaranteed qualifying number.
Does the Debt-to-Income Ratio Calculator store or upload my income and debts?: No. Every figure you type is calculated locally in your browser and never leaves your device — nothing is sent to ArrayKit or anywhere else.
Can I use the DTI calculator for a refinance instead of a new mortgage?: Yes. Enter your current income and the proposed new housing payment alongside your other debts to see how a refinance would shift your front-end and back-end DTI.

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