A jumbo loan (or jumbo mortgage) is a conventional home loan whose principal exceeds the conforming loan limit set by the Federal Housing Finance Agency (FHFA). In 2024, the baseline limit for a single-family home in most U.S. counties is $766,550, while designated high-cost counties — such as San Francisco, Los Angeles, New York, Boston, and Honolulu — use a ceiling of $1,149,825. Anything above that cap is a jumbo loan, and because it cannot be purchased by Fannie Mae or Freddie Mac, it carries stricter underwriting, larger down-payment expectations, and usually a slightly higher interest rate.
This calculator estimates your monthly principal-and-interest payment on a high-value home, tells you whether your loan is jumbo or conforming, shows how far above the limit you are, and stacks in property tax and home insurance so you see the true monthly outlay.
How to Use
- Enter the Home Price — the amount you have agreed to pay the seller. Jumbo homes typically start at $800,000 and run up into the multiple millions.
- Set your Down Payment as a percentage of price. The classic jumbo threshold is 20% down, which removes the need for private mortgage insurance and signals the lowest possible rate. Some lenders will go to 10–15% on jumbo loans, but expect a higher rate and a deeper reserve requirement.
- Type your Interest Rate (APR). Jumbo rates are typically 0.25–0.75% above conforming rates; if you have not locked a quote yet, stress-test at ±0.5% to see how sensitive a seven-figure payment is to small rate moves.
- Choose the Loan Term — 30-year fixed is by far the most common jumbo product, but 15- and 20-year terms are popular for borrowers who want to build equity quickly.
- Adjust the Conforming Loan Limit if you live in a high-cost county. The default is the $766,550 baseline; change it to $1,149,825 for Alaska, Hawaii, the District of Columbia, or the high-cost metro areas in California, New York, Washington, and a handful of other states.
- Optionally add Property Tax and Home Insurance. High-value homes are often insured under specialty HO-5 policies that run $4,000–$15,000 per year, and property tax can exceed 2% of assessed value in states like New Jersey, Illinois, and Texas.
The result card shows your down-payment dollar amount, the resulting loan amount, a Loan Classification badge (Jumbo vs. Conforming), the Amount Above Conforming Limit, the fixed monthly P&I, tax and insurance lines, the total monthly PITI, and the total interest you will pay over the full term.
How the Jumbo Payment Is Calculated
The monthly payment uses the same amortization formula as any other fixed-rate mortgage — the formula used by Fannie Mae, Freddie Mac, and every major US lender:
M = P × r(1 + r)ⁿ / ((1 + r)ⁿ − 1)
Where:
- M is the monthly payment.
- P is the loan amount (home price minus down payment).
- r is the monthly interest rate — the annual APR divided by 12.
- n is the total number of monthly payments — the loan term in years times 12.
Worked example on a $1,000,000 home with 20% down at 7.00% for 30 years: the down payment is $200,000, the loan amount is $800,000, the monthly rate is 0.005833, and n = 360. Plugging in gives a monthly P&I of $5,322.42, and over 30 years the total interest paid is about $1,116,071. Because $800,000 exceeds the $766,550 baseline conforming limit by $33,450, this loan is classified as a jumbo loan. If the same home were purchased in a high-cost county with a $1,149,825 limit, the loan would be classified as conforming (high-balance) instead.
If the rate is 0%, the formula divides by zero, so the engine simply splits the principal evenly across the number of months.
What Makes a Jumbo Loan Different
A conforming loan can be sold to Fannie Mae or Freddie Mac, which gives lenders a deep secondary market. A jumbo loan sits on the lender's own balance sheet (or is sold to a private investor), so lenders tighten the rules:
- Down payment — 20% is the standard; 10% is sometimes available but triggers jumbo mortgage insurance (JMI) and reserve requirements.
- Credit score — most jumbo programs require a 700+ FICO, with 740+ for the best rates.
- Reserves — lenders typically require 6–12 months of PITI in cash reserves after closing.
- Debt-to-income ratio — usually capped at 43–45%, stricter than conforming's 50%+ allowance.
- Appraisal — high-value homes often require two appraisals or a desktop appraisal plus field review.
- Loan amount — loans above $2–3 million are considered "super jumbo" and have even tighter criteria.
Examples
Example 1 — The reference jumbo. A buyer offers $1,000,000 on a home in Austin, puts down 20% ($200,000), locks 7.0% for 30 years, and pays 1.8% property tax with $4,500 annual insurance. The loan is $800,000; P&I is $5,322.42; tax adds roughly $1,500; insurance adds $375. Total PITI is near $7,197 per month. Because $800,000 is above the $766,550 limit, the result card flags this as a jumbo loan, $33,450 above the conforming cap.
Example 2 — High-cost county flips the classification. The same $800,000 loan in San Francisco, where the conforming limit is $1,149,825, is instead classified as a high-balance conforming loan. The monthly payment math is identical, but the rate may be slightly lower because the loan is still eligible for Fannie Mae / Freddie Mac purchase. Changing the Conforming Loan Limit input to $1,149,825 on this page instantly reclassifies the loan.
Example 3 — Super jumbo stress test. On a $2,000,000 home with 25% down at 7.5% for 30 years, the loan is $1,500,000 and P&I alone is $10,488 per month — well before tax, insurance, and reserves. Running this number before shopping prevents you from falling in love with a home your balance sheet cannot actually carry.
FAQ
What is a jumbo loan?
A jumbo loan is a conventional mortgage whose principal exceeds the FHFA conforming loan limit — $766,550 in 2024 for most U.S. counties and $1,149,825 in designated high-cost counties. Because the loan cannot be sold to Fannie Mae or Freddie Mac, lenders hold it on their own balance sheets and apply stricter underwriting.
How do I know if I need a jumbo loan?
Compare your loan amount (home price minus down payment) to the conforming limit for your county. If the loan is above $766,550 in a baseline county, or above $1,149,825 in a high-cost county, you are shopping for a jumbo loan. This calculator displays the classification badge directly on the result card.
What credit score do I need for a jumbo loan?
Most jumbo programs require a FICO score of at least 700, with 740+ needed to qualify for the lowest advertised rates. Borrowers below 700 usually pay a rate premium or must put more money down. Compare that with conforming loans, where scores in the mid-60s can still qualify with mortgage insurance.
Is a jumbo loan's interest rate higher?
Typically yes. Jumbo rates run 0.25–0.75% above conforming rates because the loan is not securitized by the GSEs and carries more lender risk. The gap widens during market stress and narrows when banks are aggressively competing for high-balance mortgages.
How much down payment is required for a jumbo loan?
Twenty percent is the classic threshold and removes the need for mortgage insurance. Some lenders will accept 10–15% down on jumbo loans, but you will usually pay for jumbo mortgage insurance (JMI), keep 6–12 months of reserves in the bank, and accept a higher rate. Putting 30%+ down often unlocks the best pricing.
Do jumbo loans have PMI?
Conventional PMI products are not available on loans above the conforming limit. Instead, lenders may charge jumbo mortgage insurance (JMI) for down payments under 20%, or they may simply price the risk into a higher interest rate. With 20% down, no insurance is required.
Are property taxes and insurance included in a jumbo payment?
They are not part of the loan itself, but most lenders collect them monthly through an escrow account and pay the county and insurer on your behalf. For high-value homes, insurance is often a specialty HO-5 policy that runs $4,000–$15,000 per year, so budgeting only the P&I line will badly understate your monthly bill.
Disclaimer
This jumbo loan calculator is provided for informational purposes only and does not constitute financial, lending, or tax advice. Conforming loan limits are set annually by the FHFA and vary by county; verify the current limit for your property's county before relying on the classification badge. Estimates are based on the inputs you enter and the standard amortization formula; actual offers vary by lender, credit profile, reserves, location, and program. Always confirm your final payment, rate, and terms directly with a licensed mortgage professional before committing to a jumbo loan.