Mortgage & real estate

Mortgage Prepayment Calculator

Enter your loan amount, rate and term to see how a biweekly prepayment plan saves interest and time.

  • Free
  • No sign-up
  • Updated for 2026

Mortgage details

$
%
yr

Enter the loan amount, rate and term to see the savings.

Worked example

With these example inputs:

  • Loan amount$300,000
  • Interest rate6.5%
  • Loan term30 yr

Biweekly payment: $948

  • Standard monthly payment$1,896
  • Total interest$295,377
  • Payoff time24 yr 2 mo
  • Interest saved$87,256
  • Time saved5 yr 10 mo

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What this mortgage prepayment calculator does

This calculator finds your biweekly payment. You enter the loan amount, rate, and term. The tool then builds a biweekly plan. So you see the payment and the interest you save. It also shows how much sooner you finish. The result uses the currency you choose.

What a biweekly plan is

A biweekly plan splits your monthly payment in half. You pay that half every two weeks. That makes twenty-six half-payments a year. So you pay one extra month each year. This extra goes straight at the balance. It quietly speeds up your payoff.

How it is calculated

The tool finds your normal monthly payment. It halves that to set the biweekly amount. It then applies twenty-six payments a year. So the loan shrinks faster than on a monthly plan. The extra payment cuts the interest. The calculator handles this for you.

What the result tells you

The result shows your biweekly payment. On a three hundred thousand loan it is about nine hundred fifty. You pay it every two weeks. The plan trims years off the loan. So a small change saves a large sum. It is just a close estimate.

The loan amount

Your loan amount is the sum you borrow. It is the balance you are paying down. A bigger loan means a bigger payment. So this number sets the base. Use your current loan balance. It is the base the rest builds on. Enter your loan amount.

The interest rate

Your interest rate is the cost of the loan. It is the annual rate you are charged. A higher rate makes prepaying save more. So this number drives the savings. Use the rate on your mortgage. Even a small change matters. Enter your interest rate.

The loan term

The loan term is the length of the loan. It is the years the schedule is set for. A longer term leaves more interest to save. So this number sets the starting plan. Use the original term of the loan. A thirty-year term is common. Enter your loan term.

The interest and time saved

The tool also shows your interest saved. Here it is about eighty-seven thousand dollars. It shows the time you save as well. The loan finishes years ahead of schedule. So you see the full reward of the plan. That is the power of one extra payment.

How to use it

Enter your loan amount first. Add the rate and the term. Read the biweekly payment in your currency. Then see the interest and time saved. Check the new payoff date. Try a different rate. Use it to plan a faster payoff.

The limits of this calculator

Keep its limits in mind. It assumes every biweekly payment is made. It ignores taxes, insurance, and fees. Some lenders do not accept biweekly plans. Some charge a fee to set one up. So take it as a rough guide. So check your lender's rules first.

A final tip

Use this to plan a faster payoff with care. Remember it works through one extra month. Make sure your lender allows biweekly pay. Confirm there is no setup fee. You can also just pay extra monthly. Do not strain your budget to do it. A careful plan needs your lender's terms.

Frequently asked questions

How does prepaying save money?

Paying half the monthly amount every two weeks adds up to one extra payment a year. That extra principal shortens the loan and cuts the total interest.

How much can biweekly payments save?

On a typical 30-year mortgage, biweekly payments often trim several years and tens of thousands in interest. The exact saving depends on your rate and balance.