House affordability calculator
$646,499 home price
$815,954 interest over 30 years
Principal $581,849 Interest $815,954. 58¢ of every dollar paid goes to interest.
Housing budget $4,666.67 a month (28% of income), 10% down, 30 years at 7.03%.
Loan $581,849, down payment $64,650.
Source: Freddie Mac Primary Mortgage Market Survey, week of September 24, 2026. An average, not an offer.
Sources
- 30-year fixed mortgage average: 7.03%. Freddie Mac Primary Mortgage Market Survey (PMMS), series MORTGAGE30US, as of September 24, 2026; retrieved September 26, 2026.
- Property tax (median effective rate by state). Tax Foundation, effective property tax rate on owner-occupied housing (Census ACS), Property Taxes by State, 2026 edition (2024 data). States not yet sourced use 0.78%, the median of the 32 state rates we have sourced, marked as an estimate.
- Homeowners insurance (average premium). NAIC homeowners report, 2022 data, HO-3 policies. Only states with a sourced figure include insurance.
- PMI assumption: 0.75% of the loan a year below 20% down. Typical range 0.5–1.5% (Urban Institute, Freddie Mac); ends at 78% of the original value under the Homeowners Protection Act (CFPB).
- 28/36 debt-to-income guideline. Lender guideline (Chase, Bankrate); CFPB debt-to-income guidance.
Numbers on this page last changed September 26, 2026. How they are calculated: methodology.