Mortgage Calculator: Here’s How Much You Need To Buy a $399,900 Home at a 6% Rate

Mortgage rates saw a slight uptick this week, as the average rate on 30-year fixed home loans rose to 6% for the week ending March 5, according to Freddie Mac. This increase follows the previous week’s 5.98% milestone, which had been the lowest level since September 2022.

So what effect does this have on your monthly mortgage payment? And what does this mean for homebuyers trying to time their entry into a volatile market?

Here’s the monthly cost of purchasing a typical home today, according to the Realtor.com® mortgage calculator.

All examples assume a 30-year fixed mortgage and include principal and interest only, excluding property taxes, homeowners insurance, and mortgage insurance.

Monthly mortgage payment today with a 20% down payment

Despite this marginal climb, current rates remain significantly more favorable than the same period in 2025, when rates averaged 6.63%.

For a homebuyer eyeing a median-priced home of $399,950, these shifting numbers translate into tangible savings. A buyer putting 20% down—financing a loan of $319,960—will now face a monthly principal and interest payment of approximately $1,918. This reflects a modest $3 monthly increase from last week’s payment of $1,915.

However, the improvement is still pronounced when compared to 2025’s 6.63% rate, which would have required a monthly payment of roughly $2,050.

This means today’s buyers are saving $132 every single month compared to those just one year ago.

Monthly mortgage payment today with a 3.5% down payment

The savings are also significant for those utilizing FHA loans with a 3.5% down payment.

On the same $399,950 home, an FHA borrower would finance roughly $385,952. At today’s 6% rate, the monthly principal and interest payment comes to approximately $2,314.

This is a $4 increase from last week’s monthly cost of $2,310.

When viewed against the 6.63% rates of March 2025, where the monthly payment sat at $2,473, today's FHA borrowers are keeping an extra $159 in their pockets every month.

Looking back at the October 2023 peak of 7.79%, where the payment was $2,772, the monthly savings remain a substantial $458.

Long-term savings over 30 years

The long-term financial benefits of these lower rates become even clearer when looking at the total cost of the loan over 30 years.

A buyer with a 20% down payment at today’s 6% rate will pay a total of $690,601 in principal and interest over the life of the mortgage. Contrast this with the October 2023 peak, when rates hit 7.79% and the total cost for that same loan amount reached $827,401.

By securing a mortgage in today's environment instead of that peak, a homebuyer effectively avoids $136,800 in interest charges.

FHA borrowers see a similar trajectory of long-term savings. Financing a home today at 6% results in a lifetime payment of $833,004 for principal and interest.

If that same loan had been locked in at the 7.79% peak in late 2023, the total cost would have climbed to $997,980. This represents a total long-term savings of $164,976 for FHA buyers.

While the weekly fluctuations in interest rates may seem small, the stability near the 6% mark continues to provide significant relief for both the monthly budget and the 30-year financial outlook of American homeowners.