How to Calculate Bi-Weekly Mortgage Payments and Save on Interest

If you have a mortgage, you probably make one payment every month. That's 12 payments a year. But what if you could pay off your loan faster — without changing your lifestyle much? That's exactly what bi-weekly mortgage payments can do for you.

In this guide, we'll explain what bi-weekly payments are, how to calculate them yourself, and how much money you can actually save over the life of your loan.

What Is a Bi-Weekly Mortgage Payment?

A bi-weekly mortgage payment means you pay half of your monthly mortgage amount every two weeks instead of one full payment each month.

Here's the simple math behind it:

• Monthly payment schedule = 12 payments per year
• Bi-weekly payment schedule = 26 payments per year (52 weeks ÷ 2)

Since 26 payments of half your monthly amount equals 13 full monthly payments, you end up making one extra full payment every year — without even noticing it.

💡 Key Point: That one extra payment per year is what helps you pay off your mortgage years earlier and save thousands in interest.

How to Calculate Your Bi-Weekly Payment

The formula is very simple:

Bi-Weekly Payment = Monthly Mortgage Payment ÷ 2

Example:

Let's say your monthly mortgage payment is $1,800.

• Bi-weekly payment = $1,800 ÷ 2 = $900 every two weeks
• Total paid per year = $900 × 26 = $23,400
• Monthly schedule total = $1,800 × 12 = $21,600
• Extra paid per year = $1,800 (one full extra payment)

That extra $1,800 a year goes directly toward your loan principal, which reduces the amount you owe — and cuts down the interest you pay over time.

How Much Can You Save? (Real Numbers)

Let's look at a real example so you can see the actual savings:

Just by splitting your payment in half and paying every two weeks, you could save over $66,000 in interest and pay off your home more than 4 years early.

Bi-Weekly vs Monthly Payments: Which Is Better?

For most homeowners, bi-weekly payments are the better choice — if your lender allows it and applies the payments correctly. Here's a quick comparison:

⚠️ Important: Make sure your lender applies bi-weekly payments right away — not at the end of the month. Some lenders hold the first bi-weekly payment and only apply it when the second one arrives. If that's the case, you won't get the full benefit. Always confirm with your lender.

How to Set Up Bi-Weekly Payments

Here are three ways to switch to a bi-weekly payment schedule:

• Ask your lender directly — Many mortgage servicers offer a bi-weekly program. Some may charge a small setup fee.
• Set up autopay yourself — If your bank allows it, schedule automatic transfers of half your mortgage payment every two weeks. Then manually send the extra to your lender as a principal payment.
• Make one extra payment per year manually — If bi-weekly is too complicated, simply make one extra mortgage payment each year (labeled "principal only"). You'll get nearly the same benefit.

Things to Watch Out For

• Prepayment penalties: Some loans have penalties for paying off early. Check your loan agreement first.
• Lender processing: Confirm that extra payments go toward principal, not future interest.
• Third-party programs: Be careful of companies that charge fees to set up bi-weekly payments. You can usually do it yourself for free.

Final Thoughts

Bi-weekly mortgage payments are one of the simplest ways to save a huge amount of money over the life of your loan. By paying half your mortgage every two weeks instead of once a month, you make one extra full payment per year — and that small change can save you $50,000 to $100,000 in interest depending on your loan size and rate.

The best part? You don't need to earn more money or make big sacrifices. Just change when you pay.

If you want to see the exact numbers for your loan, plug your details into a bi-weekly mortgage calculator and see how many years — and how much interest — you could save starting today.