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  5. House Affordability Calculator

How Much House Can I Afford?

Estimate an affordable purchase price for a home based on household income, debt-to-income limits, down payment, interest rate, taxes, insurance, and fixed monthly housing budgets.

House affordability based on income and debt

Use household income, recurring debt, and lender-style DTI limits to estimate a home price.

Estimated affordable home price

$354,698

Estimated total monthly housing cost: $2,800

Monthly gross income
$10,000
Back-end DTI used
36%
Housing budget limit
$2,800
Principal and interest
$1,765
Taxes and fees
$1,035
PMI estimate
$0
Budget remaining
$0

House affordability based on fixed, monthly budgets

Start with a monthly housing budget and work backward to an estimated purchase price.

Estimated home price from budget

$443,373

Estimated total monthly housing cost: $3,500

Monthly budget
$3,500
Costs included
Yes
Loan amount
$354,698
Principal and interest
$2,207
Taxes and fees
$1,293
PMI estimate
$0
Budget remaining
$0

How the Calculator Works

The income-based calculator estimates a maximum monthly housing payment from gross monthly income and recurring debt. It then works backward through mortgage principal and interest, taxes, insurance, HOA or co-op fees, maintenance, PMI, loan term, and down payment to estimate a purchase price.

The fixed-budget calculator starts with the amount you want to spend each month on housing and estimates the home price that fits that monthly payment.

Debt-to-Income Ratios

Mortgage affordability is often framed through front-end and back-end debt ratios. The front-end ratio compares monthly housing costs to gross monthly income. The back-end ratio includes housing costs plus recurring debts such as car loans, student loans, and credit cards.

Conventional loan estimates use the 28/36 rule, FHA estimates use 31/43, and VA estimates use a 41% back-end ratio. Custom ratios from 10% to 50% let you compare more conservative and more aggressive purchase scenarios.

Improving Affordability

  • Reduce recurring monthly debt before applying for a mortgage.
  • Increase the down payment to lower the loan amount and possible PMI.
  • Improve credit so lenders may offer a lower interest rate.
  • Save more cash reserves, especially when your DTI is near a lender limit.
  • Compare less expensive homes or different locations when the payment is too tight.

FAQ

What debt-to-income ratio should I use?

The conventional 28/36 rule is a common conservative starting point. FHA and VA options use higher back-end ratios, while the custom option lets you test a more conservative or more aggressive budget.

Does the calculator include property tax and insurance?

Yes. The income-based estimate includes property tax, insurance, HOA or co-op fees, maintenance, and an estimated PMI amount when the down payment is below 20%. The fixed-budget calculator lets you include or exclude those costs.

Is this the same as mortgage approval?

No. Lenders can use different underwriting rules, credit requirements, reserves, loan limits, and local tax or insurance assumptions. Treat this as a planning estimate before speaking with a lender.