Jumbo Loan Calculator
A jumbo loan is a mortgage that exceeds the conforming loan limits set annually by the Federal Housing Finance Agency (FHFA). For 2025, the conforming loan limit for a single-family home in most of the contiguous United States is $806,500; properties in high-cost areas designated by the FHFA have limits up to 150% of the standard limit. Loans above these thresholds cannot be purchased or guaranteed by Fannie Mae or Freddie Mac, so lenders retain them on their own balance sheets and typically charge a slightly higher interest rate to compensate for the concentration risk. Historically jumbo rates have been 0.25 to 0.50 percentage points above conforming rates, though the spread narrows and widens with market conditions. Jumbo loan underwriting requirements are generally stricter: lenders typically require a down payment of 10% to 20%, a credit score of 720 or higher, substantial cash reserves after closing, and full documentation of income and assets. This calculator shows the monthly payment for a jumbo loan at the rate you specify, compares it to what the equivalent conforming loan would cost at a lower conforming rate, and quantifies the total extra cost of the jumbo premium over the life of the loan, helping you decide whether a large down payment to bring the loan below the conforming limit would generate enough savings to be worthwhile.
Your -- loan of -- at --% has a monthly payment of --.
How jumbo loans are classified and priced
A mortgage is classified as jumbo if the loan amount exceeds the FHFA conforming limit for the property's county. The 2025 standard limit is $806,500 for a 1-unit property. High-cost areas (such as parts of California, New York, Massachusetts, and others) can have limits up to $1,209,750. Alaska, Hawaii, Guam, and the US Virgin Islands use the high-cost limit regardless of local prices.
Jumbo lenders charge a higher interest rate to compensate for the greater risk of keeping the loan in portfolio. This premium typically ranges from 0.25% to 0.75% above conforming rates, depending on loan size, borrower credit, down payment, and market conditions. A larger jumbo loan (well above the limit) may carry a higher premium than one just slightly above the limit.
loan amount = home price - (home price x down payment %)
if loan amount > conforming limit: jumbo
monthly payment = PMT(rate/12, term x 12, loan amount)
premium basis points = (jumbo rate - conforming rate) x 100
extra interest = (payment at jumbo rate - payment at conforming rate) x months
Worked example
Home $1,200,000, 20% down, conforming limit $806,500, jumbo rate 7.25%, conforming rate 6.875%, 30-year term:
- Loan amount = 1,200,000 - (1,200,000 x 0.20) = $960,000
- Loan is jumbo because $960,000 > $806,500
- Jumbo payment at 7.25% = approximately $6,527
- Conforming payment at 6.875% = approximately $6,400
- Premium = 7.25% - 6.875% = 0.375% (37.5 basis points)
- Extra monthly = $6,527 - $6,400 = approximately $127
- Total extra interest over 30 years = $127 x 360 = approximately $45,720 (minus some principal overlap)
Strategies for managing jumbo loan costs
If you are a jumbo borrower, consider these strategies to minimize your long-term cost. First, make extra principal payments to reduce your balance below the conforming limit as quickly as possible, at which point you may be able to refinance into a conforming loan at a lower rate. Second, if rates fall significantly, a jumbo refi may offer substantial savings even at a slightly higher rate. Third, ensure your credit profile is as strong as possible when applying, as lenders reserve the best jumbo rates for borrowers with 740+ credit scores and strong income documentation.
A final consideration is the conforming loan limit increase strategy. In some cases, if you can negotiate the purchase price down or increase your down payment to get your loan amount just under the conforming limit, you unlock a lower rate immediately. For example, reducing a $1,000,000 loan to $806,500 could save 0.5% in rate, which translates to approximately $100+ per month over 30 years.
The CFPB provides guidance on mortgages and refinancing at consumerfinance.gov/owning-a-home.
Jumbo loan calculator: frequently asked questions
What is a jumbo mortgage?
A jumbo mortgage is a loan that exceeds the FHFA conforming loan limit and therefore cannot be purchased by Fannie Mae or Freddie Mac, the government-sponsored enterprises that buy mortgages from banks. Jumbo loans are kept in the originating lender's portfolio or sold in the private mortgage market, typically at a higher interest rate than conforming loans. The CFPB provides information on loan types at consumerfinance.gov.
What are the 2025 FHFA conforming loan limits?
The Federal Housing Finance Agency (FHFA) sets conforming loan limits annually. For 2025, the standard limit is $806,500 for a 1-unit property in most counties. High-cost areas (with median home prices in the highest quartile) can have limits up to 150% of the standard limit, which is $1,209,750. Alaska, Hawaii, Guam, and the US Virgin Islands use the high-cost limit regardless of actual home prices. Source: FHFA News Release (November 2024).
How does a jumbo loan rate differ from a conforming rate?
Jumbo loan rates are typically 0.25% to 0.75% higher than conforming rates, depending on loan size, borrower credit, and market conditions. This premium reflects the higher risk to the lender (loans cannot be sold to Fannie Mae or Freddie Mac) and typically tighter qualification requirements (minimum 680 credit score, 20% down, lower debt-to-income ratios). This calculator allows you to compare the cost difference between your actual expected jumbo rate and a conforming rate.
What down payment do jumbo lenders typically require?
Most jumbo lenders require a minimum down payment of 20% of the home price. Some lenders may accept 15% down for borrowers with excellent credit. Down payments below 20% typically require mortgage insurance, which adds to the monthly cost. If your down payment is less than 20%, the calculator will flag this with a note about typical jumbo lender requirements.
How much extra interest does a jumbo loan cost over its lifetime?
This depends on the size of the jumbo premium and the loan amount. For example, a $1,200,000 home purchase with 20% down ($960,000 loan) at a jumbo rate of 7.25% versus a conforming rate of 6.875% (0.375% premium) costs approximately $13,000 more in interest over a 30-year term. The calculator shows this comparison for your specific numbers.
Can I refinance a jumbo loan into a conforming loan?
If your loan balance falls below the conforming limit (usually through principal paydown), you may be eligible to refinance into a conforming loan at a lower rate. For example, after 10 years of payments on a $1,000,000 jumbo loan, your balance might drop below the limit, allowing refinancing. This is a key long-term strategy for jumbo borrowers: treat the jumbo phase as temporary until principal reduction gets you into conforming territory.
Official sources
- FHFA: Conforming Loan Limits (2025 limits, updated November 2024).
- CFPB: What is a jumbo loan?
- CFPB: Owning a Home resource center.
Reviewed by the CalculatorHub team, edited by James Graham, 13 June 2026. See our methodology. General information, not financial advice.