Mortgage Affordability

Estimate the home price you can afford from income, debt, and target DTI

About this calculator

The Mortgage Affordability Calculator estimates the home price you can afford from gross annual income, existing monthly debt, and a target debt-to-income ratio. It derives your maximum monthly housing payment (PITI), splits it between principal & interest and tax & insurance — solving iteratively because tax and insurance scale with the home price — and reports the maximum loan and home price including your down payment. Rates, term, and annual tax/insurance percentages are all adjustable.

How to use the Mortgage Affordability calculator

  1. Enter your amounts, rates and terms into the input fields.
  2. Read the result — it updates instantly as you type.
  3. Adjust the inputs to compare scenarios side by side.
  4. Copy the page URL to share the exact calculation.

Common examples

  • $96k income, $400 debts, 28% DTI, 6.5%/30 yr, $40k down → $1,840/mo budget → ≈$273,428 home
  • $150k income, $800 debts, 36% DTI, 7%/30 yr, $80k down → $3,700/mo → ≈$519,098 home
  • $60k income, no debts, 28% DTI, 6%/15 yr, $20k down → $1,400/mo → ≈$161,920 home

Frequently asked questions

How does the Mortgage Affordability calculator work?

Enter your amounts, rates and terms, and the calculator applies the standard financial formulas to show the outcome, including intermediate figures where they help you understand the result. All arithmetic runs at high precision, so rounding errors do not build up across periods.

When would I use the Mortgage Affordability calculator?

Use it when planning a purchase, loan, investment or budget, to compare options before committing, or to sanity-check figures quoted to you. It is an educational tool, not financial advice — confirm important decisions with your provider or a professional.

How accurate are the results?

The formulas are the standard ones used in finance and run at 30 significant digits internally. Real products may differ in fees, compounding conventions and rounding rules, so treat the result as a close estimate rather than a contractual figure.

Can I share a specific calculation with someone else?

Yes. Every value you enter updates the URL, so copying the address bar and sharing the link reopens the exact same calculation for whoever clicks it.