Mortgage Affordability Calculator

Solve a mortgage budget from front-end and back-end debt-to-income constraints.

Maximum modeled home price

$437,543

Limited by front-end DTI.

Maximum housing payment$2,800

Maximum loan$350,035

Down payment$87,509

Principal and interest$2,212

Tax, insurance, PMI and HOA$588

Housing DTI28.0%

Total DTI33.0%

This models DTI, not approval or a comfortable budget. Credit, assets, reserves, loan rules, utilities, maintenance, and cash to close also matter.

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Planning guide

Read the complete guide →

Understand this estimate before using it

Quick answer

What does the Mortgage Affordability Calculator do?

Solve a DTI-supported home price from income, debts, and loan terms. It applies entered debt-to-income limits to income and other debts, reserves room for non-loan housing costs, and solves for supported principal and price.

Formula and calculation method

It applies entered debt-to-income limits to income and other debts, reserves room for non-loan housing costs, and solves for supported principal and price.

The result is only as reliable as the inputs. Use current balances, rates, fees, dates, and documents; then change uncertain assumptions to see whether the conclusion remains stable.

How to interpret the result

Treat the output as a comparison or planning range, not a quote, approval, eligibility decision, tax return, or prediction. Review the breakdown—not only its headline number—and read every stated exclusion.

For current background, review CFPB mortgage resources. Product documents and official program tools control when they differ from this educational model.

Worked scenario

Put the result in context

For a $320,000 loan at 6.5% for 30 years, first calculate principal and interest, then add the property’s actual tax, insurance, mortgage-insurance, and association assumptions. Compare that complete payment with the household budget, not with principal and interest alone.

This scenario illustrates the method; it is not a quote, forecast, recommendation, or substitute for entering your actual facts.

Before you calculate

Gather current information before changing the defaults. A result based on verified records is more useful than a precise answer built from guesses.

annual income and existing monthly debt

Check the date, unit, and source of this input before entering it.

the front-end and back-end DTI limits

Check the date, unit, and source of this input before entering it.

down payment, rate and term

Check the date, unit, and source of this input before entering it.

property tax, insurance, PMI and HOA

Check the date, unit, and source of this input before entering it.

What the result can answer

It can show how the entered assumptions interact, provide a consistent comparison, and reveal whether changing one important input materially changes the estimate.

What the result cannot decide

It cannot confirm approval, eligibility, market pricing, future performance, legal or tax treatment, contract quality, or whether the choice fits every part of your finances.

A practical next-step workflow

01 · Verify
Compare the inputs with current statements, quotes, official rules, and product documents.
02 · Stress-test
Run a second case with a less favorable value for property tax, insurance, PMI and HOA.
03 · Confirm
Pair this DTI ceiling with a check that you can actually fund the down payment and closing costs, then get a pre-approval before acting.

Frequently asked questions

Which mortgage calculator should I use first?

Begin with affordability, then use the mortgage calculator for a property-specific payment. Use points, ARM, VA, construction, or refinance tools only when those structures apply.

Do these tools determine loan approval?

No. They are planning estimates. Lenders apply their own income, credit, reserve, property, insurance, and underwriting requirements.

What can make this estimate differ from an actual result?

Timing, rounding, rate changes, fees, taxes, eligibility rules, product conventions, and facts not requested by this focused calculator can all create differences.

Which inputs deserve a second scenario?

Retest any input that is quoted rather than fixed, depends on future behavior, or materially changes the result. Conservative and optimistic cases reveal more than false precision.

What should I verify before making a decision?

Verify current statements, disclosures, official rules, taxes, fees, cancellation or prepayment terms, and the consequences of a less favorable outcome.

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Prepared by Loan Lyze Editorial and reviewed under the Loan Lyze editorial framework on November 8, 2026. Educational estimate only. See our methodology, editorial policy, and corrections policy.

Mortgage Affordability Calculator

Estimate lender-style affordability