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Debt-to-Income Calculator

My debt-to-income calculator might be the most important calculator you use during the home buying process.

Why? Because the number one reason mortgages are declined is because of a debt-to-income ratio (DTI) that’s too high.

It’s not credit score or down payment or anything else. It’s DTI!

So knowing your DTI and what’s acceptable is paramount when it comes to qualifying for a mortgage and thereby purchasing a home.

The calculator below is easy to use and factors in things like student loan debt to boost accuracy across all different loan types.

Debt-to-Income (DTI) Calculator

Estimate your front-end (housing) and back-end (total) debt-to-income ratios — the numbers lenders use to decide how much mortgage you can qualify for — based on your gross income, proposed housing payment, and other monthly debts.

Monthly Gross Income

$
Salary, wages, self-employment, or other qualifying income
$
Bonus, overtime, alimony/child support received, etc.

Proposed Housing Payment

$
$
%
 
%
yrs
$
$
$
$
PMI, FHA MIP, etc. — leave blank if not applicable
$
Principal, interest, taxes, insurance, HOA, and mortgage insurance combined

Other Real Estate (optional)

💡 This section is entirely optional — if this is your first home, or you don’t own any other property, skip it and leave the box below unchecked.

Other Monthly Debt Payments

💡 Only include recurring debts — installment loans, minimum credit card payments, and support obligations. Leave out utilities, groceries, insurance premiums (already counted above), or debts with 10 or fewer payments remaining.
$
$
$
Monthly payment shown on your credit report or loan statement
$
$
$
$

Loan Program Fit

Debt Breakdown

—
Total

Itemized Estimate

Disclaimer: This calculator is for informational and educational purposes only and does not constitute financial, legal, or tax advice. It does not guarantee mortgage approval or a specific interest rate. The optional Other Real Estate section applies the standard agency guideline for a rental property you already own: 75% of gross rent offsets that property’s mortgage payment, with only a resulting shortfall (if any) counted as debt; a second home or vacant property with no rental income is counted at its full payment. Actual treatment can vary by lender, by whether the rental history is documented via lease or two years of tax returns, and by loan program. The Loan Program Fit results use each program’s published treatment of a deferred, forbearance, or $0 income-driven student loan payment: Conventional follows Fannie Mae’s rule of 1% of the outstanding balance (Freddie Mac lenders may instead use 0.5%, which would lower the conventional ratio shown here); FHA and USDA both use 0.5% of the outstanding balance per HUD and USDA guidelines; VA uses 5% of the outstanding balance divided by 12, except that VA may exclude the debt entirely if it is documented as deferred for at least 12 months past your closing date, which this calculator does not attempt to verify. Qualifying DTI thresholds shown (Conventional ~45%, FHA ~43%, VA ~41%, USDA ~41% back-end / 29% front-end) are general industry benchmarks, not hard cutoffs — individual lenders, automated underwriting systems, and compensating factors (credit score, cash reserves, residual income) can push actual approvals higher or lower than shown here. Principal & interest is estimated using a standard fixed-rate amortization formula; your actual payment will depend on your lender’s underwriting, your final rate, and any fees or mortgage insurance not entered here. Consult a licensed mortgage professional for how your actual DTI will be calculated and evaluated.

How to Use the Debt-to-Income Calculator

As noted, it’s pretty simple and straightforward.

You start by entering your gross income, which is before any taxes are taken out. So if your salary is $150,000 per year, you can enter $12,500 in the “Mo”tab or $150,000 if you select the “Yr” tab.

If you have any other income, such as alimony, bonuses, etc., you can enter it in the “Other Monthly Income” box as well. If it's an annual sum, simply divide by 12.

[Searching for a home loan? See your options with dozens of lenders fast.]

The next section covers the proposed housing payment on the property you’re buying.

Enter a purchase price and a down payment dollar amount or percentage. This is very important to determine both the loan amount and the loan-to-value ratio (LTV).

The mortgage rate and loan term will determine the monthly mortgage payment (principal and interest.

Then you need to enter the annual homeowners insurance and property tax bills, which will determine your full PITI (principal, interest, taxes, insurance).

There could be additional monthly costs as well if your loan is subject to mortgage insurance and/or HOA dues.

If these apply, enter the amounts as well to ensure you don’t underestimate your monthly housing payment.

If they don’t apply to you, there is no need to enter them. For example, if you don’t have an HOA, you don’t need to enter it.

Same with mortgage insurance. If you put down 20% or more on a conventional loan you don’t need to pay it.

One of the perks of coming in with a larger down payment. It also means your loan amount is smaller, which can lower your DTI ratio as well.

Conversely, if you put down just 3% or 3.5%, you’ll have a larger loan amount and you’ll need to pay mortgage insurance.

The combination a low down payment and mortgage insurance can easily drive your DTI over the acceptable range.

Next up is any other real estate you already own. If you’re a first-time home buyer, you can ignore this section entirely.

If you own other properties with existing mortgages, enter them here. You’ll be able to use any verifiable rental income to offset the costs.

Similar Incomes and Different Liabilities Can Result in Completely Different DTIs

That brings us to the other monthly liabilities section, which can make two identical incomes pencil completely differently.

For example, if two borrowers are both making $150,000 a year, but one has a ton of credit card debt, an expensive car lease, and student loans, their DTI will be much higher than the person without all those things.

This is why it’s basically impossible to answer the age-old “how much can I afford” question without knowing both your income AND your debts.

If you have a ton of debts, it’ll eat into your income. The opposite is also true. Someone who makes less, but has no debt could possibly qualify for a larger mortgage.

So if and when you’re pondering a home purchase, try to keep all those other debts down to maximize your purchasing power. Same goes for those pesky BNPL loans. Avoid if possible.

Go ahead and enter all your monthly liabilities that show up on a credit report, such as car payments, student loans, credit card minimum payments (not the full balance), personal loan payments, alimony, etc.

Then you can hit “Calculate My DTI” to see where you stand.

One neat feature to my DTI calculator is the ability to differentiate the treatment of any student loan debt by loan type (assuming a monthly payment isn’t on your credit report).

So if your loans are deferred, a different minimum payment can be calculated for mortgage approval purposes.

This means depending on the loan type you go with (FHA vs. conventional), or VA, or USDA, it will calculate the debt differently.

And that could make or break a loan approval.

Student loans aside, the DTI calculator also shows you approval odds based on the DTI and the loan type.

For example, FHA loans and VA loans tend to be more forgiving when it comes to your debt-to-income ratio, while conventional and USDA loans can be tougher.

Once you hit submit, you’ll see one of three ratings, including:

- Qualifies
- Possible
- Over limit

The first is straightforward. Based on DTI alone, the loan qualifies for the financing in question, whether it’s conventional, government (FHA, VA, USDA), or all loan programs.

Note that this is just DTI though. There are other qualifying criteria for mortgages, such as minimum credit score, down payment, asset reserves, etc.

A “possible” result means you might qualify based on DTI if you have other positive compensating factors like excellent credit scores, large down payment, sizable reserves, etc.

And finally, an “over limit” result means your DTI is too high to qualify for the loan program(s).

In this case, you’ll either need to make more money, put down a larger down payment, and/or reduce your monthly debts to qualify DTI-wise.

Note that the DTI calculator simply provides estimates and to speak with a licensed loan officer or mortgage broker to determine eligibility.

There might be cases where even an “over limit” DTI can qualify for home loan financing. Or options to bring down your DTI, whether it's a larger down payment, lower purchase price, or reduced mortgage rate.

Colin Robertson
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