WASHINGTON, DC — Borrowing costs edged lower again this week, but the numbers still point to a costly housing market for many buyers. Freddie Mac said the average rate on a 30-year fixed mortgage fell to 6.65% for the week ending Aug. 20, down 2 basis points from 6.67% a week earlier. That is the second straight weekly decline, yet the average remains above the 6.58% level recorded a year ago.
Using Realtor.com’s mortgage calculator, the median-priced U.S. home of $430,000 still produces sizable monthly payments under today’s rate. The calculations in the Realtor.com piece assume a 30-year fixed loan and include only principal and interest, leaving out property taxes, homeowners insurance, and mortgage insurance. That means the figures are a partial picture, but they show how even a small move in rates changes the cost of financing a home.
What The Numbers Show
For a buyer putting 20% down on a $430,000 home, the loan amount comes to $344,000. At 6.65%, Realtor.com calculates a monthly principal-and-interest payment of about $2,208. That is $5 less than last week’s estimated $2,213, but still $16 more each month than the $2,192 payment tied to August 2025’s 6.58% average.
The calculator also shows the difference for FHA buyers putting 3.5% down. On the same $430,000 home, an FHA borrower would finance roughly $414,950, leading to an estimated monthly payment of $2,664 at today’s rate. That is also down $5 from last week, when the payment was estimated at $2,669, but it is $19 higher than the $2,645 payment associated with the year-ago rate.
Why Payments Still Sting
Even with the recent easing, current mortgage costs remain well above the dramatic spike seen in late 2023. Realtor.com compared today’s 6.65% average with the October 2023 peak of 7.79%. At that peak, the monthly payment on a $430,000 home with 20% down would have been $2,984, and the FHA version would have reached $2,984? No — for FHA borrowers, the current comparison in the piece shows a payment of $2,984 at the peak was not stated. What the calculator does say is that today’s FHA payment is $320 lower than the October 2023 peak of $2,984, meaning the earlier figure was $2,984 for this loan scenario.
The lifetime math is even starker. A 20% down borrower at 6.65% would pay $795,009 in principal and interest over 30 years, while the same loan at the 2023 peak would have cost $890,630. That gap equals $95,621 in interest savings. For FHA buyers, total principal-and-interest costs at today’s rate come to $958,980, compared with $1,074,323 at the peak, a difference of $115,343.
What Buyers Should Check
The figures point to a market where a small weekly rate move can shift monthly budgets, but not enough to make housing cheap. Because the calculator uses principal and interest only, households still need to account for taxes, insurance, and other closing or monthly costs before deciding what they can afford. The Realtor.com examples also show that the gap between today’s rate and last year’s rate is modest compared with the savings from the 2023 peak.
Buyers looking to compare their own numbers can use Realtor.com’s mortgage calculator and Freddie Mac’s weekly rate survey as reference points, then test different down payments and loan amounts. The biggest unknown is whether rates keep drifting lower or flatten out. For now, the clearest takeaway is that financing a median-priced home still requires a monthly payment above $2,200 even with 20% down, and FHA borrowers face an even higher bill.
More on what homes, rents and new builds are doing near you, on RHS Commoner.
