An illustration of a house

Calculate mortgages costs as interest rates remain near recent highs

Updated Oct. 4 at 10:49 a.m.Originally published July 8, 2022

Mortgage rates have been at their highest point in more than 20 years, adding thousands in costs for would-be home buyers. The average interest rate for a 30-year fixed mortgage has risen to 6.1 percent as of Oct. 4, according to the Freddie Mac, up from an average of about 3 percent in December 2021.

[See how many all-cash buyers snagged houses in your neighborhood]

Below, you can see how this jump affects the monthly cost of a typical mortgage. If you already have a mortgage, plug in your existing interest rate to see how much more expensive it would be if you signed today.

How much more expensive a mortgage is at 6.1% interest

House price
$
Down payment
%
Old interest rate
%
Dec. 2021 average
Monthly principal and interest payments
at 3% interest$1,518
at 6.1% interest$2,182
Monthly differenceDifference+$664
Note: Calculations are based on a fixed 30-year mortgage. Calculations ignore mortgage insurance, closing costs, HOA fees, property taxes and other payments.

While the principal — the amount borrowed that needs to be paid back — stays the same, the change in interest payments can be enormous. Over the course of a 30-year mortgage, additional interest can add up to hundreds of thousands of dollars.

Total payments over a 30-year mortgage
After putting 20% down on a $450K house
At 3% interest, $546K total
$186K interest
$360K
principal
At 6.1% interest, $785K total
$425K interest
$360K
principal

The 6.1 percent figure is just the average 30-year rate. The actual rate that a home buyer gets depends on other factors such as income, debt, credit history and the size of the down payment.

To tame inflation, the Federal Reserve has been raising interest rates. This makes buying a home even more expensive in a market where home values skyrocketed during the pandemic.

Illustration by Alyssa Fowers.