Jumbo vs Conforming Loan Calculator
Determine whether your loan qualifies as a conforming or jumbo mortgage and compare monthly payments at each rate. Use this when buying a home where the loan amount may exceed the FHFA conforming limit.
About this calculator
When you borrow more than the FHFA conforming loan limit (typically $766,550 in 2024), your loan is classified as a jumbo mortgage and is ineligible for purchase by Fannie Mae or Freddie Mac. This extra risk means lenders charge higher rates on jumbo loans. The monthly payment in both cases uses the standard amortization formula: M = P × [r(1+r)³⁶⁰] / [(1+r)³⁶⁰ − 1], where P is the loan principal (home price minus down payment) and r is the monthly interest rate (annual rate ÷ 12). If (homePrice − downPayment) exceeds the conforming limit, the jumbo rate applies; otherwise the conforming rate applies. Even a small rate difference of 0.25%–0.5% on a large balance can mean hundreds of dollars more per month, making it worth considering a larger down payment to fall under the limit.
How to use
Suppose you buy a $900,000 home with a $100,000 down payment. Your loan amount = $800,000, which exceeds the $766,550 conforming limit, so the jumbo rate applies. With a jumbo rate of 7.25% (monthly r = 0.07250/12 ≈ 0.006042), your payment is: M = 800,000 × [0.006042 × (1.006042)³⁶⁰] / [(1.006042)³⁶⁰ − 1] ≈ $5,460/month. Had your loan been $766,550 at a conforming rate of 6.875%, the payment would be roughly $5,034/month — a difference of ~$426/month, or over $5,100/year.
Frequently asked questions
What is the conforming loan limit and how does it affect my mortgage rate?
The conforming loan limit is set annually by the FHFA and defines the maximum loan size eligible for purchase by Fannie Mae and Freddie Mac. For 2024 the baseline limit is $766,550 for a single-family home in most U.S. counties, with higher limits in designated high-cost areas. Loans above this threshold are classified as jumbo mortgages, which lenders must keep on their own books or sell in private markets. Because this increases lender risk, jumbo loans typically carry interest rates 0.25%–0.75% higher than conforming loans, raising your monthly payment significantly on large balances.
How can I avoid getting a jumbo loan when buying an expensive home?
The most direct approach is to increase your down payment so that the financed amount falls at or below the conforming limit. For example, on a $900,000 home you would need at least $133,451 down to keep the loan conforming. Another option is a piggyback loan structure, where you take a first mortgage at the conforming limit and a smaller second mortgage or HELOC for the remainder. Each strategy has trade-offs in liquidity and second-mortgage rates, so it pays to run the numbers with this calculator before deciding.
When does it make financial sense to take a jumbo loan instead of a conforming loan?
A jumbo loan makes sense when the rate premium is small and the property clearly warrants the higher loan amount — for instance, when rates differ by less than 0.25% or when putting more money down would deplete emergency reserves. High-credit-score borrowers (740+) with large asset reserves often qualify for jumbo rates that are competitive with conforming rates. It also makes sense if you plan to sell or refinance within a few years, limiting the cumulative cost of the higher rate. Always compare total interest paid over your expected holding period, not just monthly payments.