What Does a Mortgage Cost at 3% Interest?
A 3% mortgage rate is one of the lowest in modern history. See exactly what it costs per month, how it compares to today's rates, and why holders of 3% mortgages rarely want to give them up. To calculate your mortgage payment at today's current rate, use our flexible mortgage calculator.
Calculate Your Mortgage Payment at 3%
Understanding a 3% Mortgage Rate
3% is a historically rare low rate, seen in 2020–2021 during pandemic-era monetary policy. At 3% on a $320,000 30-year loan, the monthly payment is approximately $1,349, with total interest of $165,640 and a total cost of $485,640.
Compare that to a 6.5% rate on the same loan: the monthly payment jumps to $2,023 — $674 more per month and $242,640 more in total interest over 30 years.
- Monthly at 3%: $1,349 — a payment that is almost impossible to replicate today
- Monthly at 6.5%: $2,023 — the approximate market rate in 2023–2024
- Total interest savings at 3%: over $242,000 compared to 6.5%
Borrowers who locked in 3% rates have enormous payment advantages and a level of housing affordability that is essentially unavailable to new buyers in the current rate environment.
Monthly Payment at 3% by Loan Amount (30-Year Term)
See your monthly principal and interest payment at 3% across common loan sizes, along with total interest paid over the full 30-year term.
| Loan Amount | Monthly Payment | Total Interest | Total Cost |
|---|
Even on a $500,000 loan, a 3% rate keeps the monthly payment under $2,110 — a figure that would require a loan of only about $330,000 at 7%.
15-Year vs. 30-Year at 3% — The Trade-off Changes
At 3%, the spread between 15-year and 30-year payments is much smaller in absolute dollar terms than it is at 7%+. Here is the comparison for a $320,000 loan:
| Term | Monthly Payment | Total Interest | Interest Savings vs. 30yr |
|---|---|---|---|
| 30-year at 3% | $1,349 | $165,640 | — |
| 15-year at 3% | $2,210 | $77,800 | $87,840 saved |
The monthly difference is $861. At 3%, the case for choosing the 30-year term is stronger than at higher rates — the interest savings from a 15-year term are real but smaller in proportional terms, while the cash flow flexibility of a 30-year term remains intact. Many 3% borrowers chose the 30-year specifically to maximize monthly flexibility while investing the difference.
Frequently Asked Questions
Is a 3% mortgage rate still available?
As of 2024–2025, 3% fixed-rate mortgages are essentially unavailable for new originations. Rates rose sharply from 2022 onwards. Existing borrowers with 3% rates should consider carefully before refinancing or selling, as their rate is very unlikely to be replicated in the near term.
How much cheaper is 3% vs 6% on a $300K mortgage?
On a $300,000 loan over 30 years, 3% costs $1,265/mo and $155,332 total interest vs. 6% at $1,799/mo and $347,515 total interest — a difference of $534/mo or $192,183 in total interest over the loan life.
Should I refinance out of a 3% mortgage?
Almost never, unless you have a compelling reason (e.g., shortening to 15yr, cash-out for a very high-return investment, or the rate is adjustable). A 3% fixed rate is extremely valuable. Refinancing to a higher rate, even to pull equity, is almost always financially harmful. The “golden handcuff” effect — where owners keep 3% mortgages — is real and rational.
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Read the guide →What to Look For When Comparing Mortgage Rates
Even a 0.25% difference in your mortgage rate changes your total interest paid by tens of thousands of dollars over a 30-year term. When evaluating lenders, consider these factors alongside the headline rate:
- APR vs. interest rate — the APR includes origination fees and gives a more accurate total-cost comparison across lenders
- Points — paying discount points upfront lowers your rate but extends the break-even period; worthwhile only if you stay in the home long enough
- Fixed vs. adjustable — ARMs start lower but carry rate-reset risk after the initial period; fixed rates offer long-term payment certainty
- Lender type — banks, credit unions, and online lenders each offer different rate structures, underwriting timelines, and service models
- Rate lock period — confirm how long the quoted rate is guaranteed during the underwriting process before you are committed