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A 300,000 loan at 6 percent
Enter a 300,000 balance, a 6% rate, and 30 years. The monthly payment is the usual amortization amount. Half of that is the biweekly debit. The extra thirteenth payment is applied as extra principal.
Loan amount: 25% lower
Change loan amount to 225,000 while keeping the other example values the same.
Loan amount: 25% higher
Change loan amount to 375,000 while keeping the other example values the same.
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Quick answer
What does the Biweekly mortgage payment calculate?
What is the half-month debit, and how much time can 26 payments a year save? This calculator uses loan amount, annual interest rate, and loan term to estimate half the monthly payment, every two weeks immediately in your browser.
With the values currently entered, the result is $1,034.40 — every two weeks. It also shows monthly principal and interest, extra paid each year, time saved, interest saved, and payoff with biweekly extras.
How to use the Biweekly mortgage payment
- Replace the example values with your own numbers.
- Review the result and supporting figures as they update automatically.
- Check the formula and assumptions before using the estimate for a decision.
Inputs used
- Loan amount
- Annual interest rate — entered in %
- Loan term — entered in years
Biweekly mortgage payment formula
Monthly P&I = P × r(1+r)ⁿ ÷ ((1+r)ⁿ − 1). Biweekly debit = monthly ÷ 2. Extra principal each year = one monthly payment, applied as monthly ÷ 12.
Assumptions
- CFPB defines a biweekly plan as half the monthly payment every two weeks. That is 26 half-payments, or 13 monthly payments, in a year.
- Interest is charged monthly on a fixed rate. The extra thirteenth payment is treated as extra principal, with no fee and no prepayment penalty.
Verify the inputs
Authoritative sources
These sources explain the definitions, factors, or rules behind this tool. Their geographic scope is shown because an official source for one country is not automatically valid somewhere else.
Definitions and disclosure rules for APR, mortgages, credit cards, and consumer loans.
Bi-weekly paymentUS Consumer Financial Protection BureauScope: US mortgage servicing; method is generalDefines a biweekly plan as half the monthly payment every two weeks, which is 26 payments and one extra monthly payment per year. Check fees and prepayment terms.
Mortgage servicing and extra principal paymentsUS Consumer Financial Protection BureauScope: US mortgage servicing; method is generalExplains how extra principal payments may shorten repayment and reduce interest, and why borrowers should confirm how the servicer applies them.
Sources do not endorse Calculum. Check the source date, scope, and your own documents before making a financial, tax, insurance, or reporting decision.
Practical guide
Biweekly mortgage payment example and edge cases
A biweekly plan takes half of the monthly principal-and-interest payment every two weeks. CFPB says 26 half-payments equal 13 monthly payments, so one extra monthly payment reaches the loan each year.
Example: A 300,000 loan at 6 percent
Enter a 300,000 balance, a 6% rate, and 30 years. The monthly payment is the usual amortization amount. Half of that is the biweekly debit. The extra thirteenth payment is applied as extra principal.
- Loan amount
- 300,000
- Annual interest rate
- 6 %
- Loan term
- 30 years
Calculated result$899.33every two weeks
Read the biweekly debit first, then the time and interest saved. If you would rather pick the extra yourself, use the mortgage extra payment calculator.
Example results use the default display profile. The calculator above follows your selected country and units.
How to read the result
- The headline number is half the monthly payment. That is the amount collected every two weeks.
- Time and interest saved assume the extra thirteenth payment reaches principal. A setup fee can wipe that gain. CFPB says you can often send one extra monthly payment without a biweekly program.
Edge cases worth checking
The servicer charges a biweekly fee
Subtract the fee from the interest saved. If the fee is large, skip the program and send one extra monthly payment yourself.
The note has a prepayment penalty
Read the note before sending extra principal. CFPB says small extra chunks usually avoid a penalty, but the contract still wins.
What changes the result most
Loan amount
Use a current amount for loan amount. Include fees or recurring costs that belong in the same figure.
Annual interest rate
Test a lower and higher annual interest rate. A small percentage change can move the final result more than expected.
Loan term
Keep loan term on the same time basis as the other inputs. Monthly and annual values are easy to mix up.
Try a different scenario
Small changes show whether the answer is stable or sensitive.
Loan amount: 25% lower
225,000$674.49every two weeks
Loan amount: 25% higher
375,000$1,124.16every two weeks
Annual interest rate: 25% higher
8 %$1,100.65every two weeks
Common mistakes
Check loan amount
CFPB defines a biweekly plan as half the monthly payment every two weeks. That is 26 half-payments, or 13 monthly payments, in a year. Make sure this matches the number you enter.
Keep loan term consistent
Interest is charged monthly on a fixed rate. The extra thirteenth payment is treated as extra principal, with no fee and no prepayment penalty. Use the same units and time period throughout the calculation.
Do not rely on one biweekly mortgage payment scenario
Run a cautious case and an optimistic case. The range is often more useful than one exact-looking number.
Use this result well
What is the half-month debit, and how much time can 26 payments a year save?
It cannot replace a lender quote, lease, survey, or purchase contract.