What will your monthly mortgage payment be, and how much house can you actually afford in the Seattle area? Use the calculator below to estimate both for King and Snohomish County at today’s rates — payment, taxes, insurance, and buying power in one place.
Most online calculators only show principal and interest, which badly understates what you will really pay each month around here. This one includes property tax and insurance (the full PITI payment), and it flips into an affordability mode that answers the question buyers actually ask: given my income and down payment, what price can I realistically shop?
How much house can you afford in the Seattle area? (quick reference)
A common lender guideline caps your total monthly housing and debt payments at about 36% of gross income. Using that rule with roughly $600 of other monthly debts, 20% down, and a 6.5% rate, here is the ballpark home price different King County incomes can support:
| Household income | Max monthly housing budget* | Approx. home price supported |
|---|---|---|
| $120,000 | ~$3,000/mo | ~$500,000 |
| $150,000 | ~$3,900/mo | ~$650,000 |
| $200,000 | ~$5,400/mo | ~$900,000 |
| $250,000 | ~$6,900/mo | ~$1,175,000 |
And the estimated full monthly payment (PITI) by price, with 20% down at a 6.5% rate in King County:
| Home price | Loan (20% down) | Est. monthly payment (PITI) |
|---|---|---|
| $650,000 | $520,000 | ~$3,870/mo |
| $750,000 | $600,000 | ~$4,450/mo |
| $850,000 | $680,000 | ~$5,030/mo |
| $1,000,000 | $800,000 | ~$5,900/mo |
*Max budget = about 36% of gross income minus ~$600 in other monthly debts. Estimates exclude PMI (applies under 20% down). Your real number depends on credit, loan type, and a lender pre-approval.
Estimate your payment or your buying power
Seattle Mortgage & Affordability Calculator
How to use it
- Monthly Payment tab: Enter a home price, your down payment, rate, and term. You will see the full monthly payment broken into principal and interest, property tax, insurance, and HOA.
- What Can I Afford tab: Enter your household income, monthly debts, and down payment. It estimates the top home price you can likely support using a standard debt-to-income guideline.
- Adjust the rate and property-tax fields to match your actual quote — both move the number more than people expect.
What actually goes into a Seattle-area payment
Four things: principal and interest on the loan, property tax (King County runs a bit under 1% of value a year), homeowner’s insurance, and HOA dues if the home has them. Lenders call the whole bundle PITI, and it is the number that has to fit your budget — not just the loan payment. If you put down less than 20%, add mortgage insurance (PMI) on top; this tool leaves that out so you can see the base payment clearly.
How much can you really afford?
A common lender guideline caps your total monthly debts at about 36% of gross income. The affordability mode works backward from that to a price, but it is an estimate, not a pre-approval. Two buyers with the same income can qualify for very different amounts depending on debts, credit, and loan type — which is exactly why the next step is a real conversation with a lender.
Frequently asked questions
What mortgage rate should I use?
Use a current quote if you have one. The calculator defaults to roughly 6.5%, in line with 2026 averages, but your rate depends on credit, down payment, and loan type. Nudge it up or down to see how much the payment moves.
Does this include property taxes and insurance?
Yes — the payment shown is full PITI (principal, interest, taxes, insurance) plus HOA if you enter it. It excludes PMI, which applies when you put down less than 20%.
How much house can I afford on my income?
Switch to the What Can I Afford tab and enter your income, debts, and down payment. It estimates a price using a 36% debt-to-income guideline. For a real number tied to your credit and loan program, get pre-approved.
Emily Cressey, HomePro Associates — helping Greater Seattle buyers and sellers since 2002. Call or text 206-245-8813 or visit HomeProAssociates.com.