Bi-Weekly Mortgage Calculator
Pay half your mortgage every 2 weeks → 26 half-payments = 13 full payments per year. See years off the loan + total interest saved vs the standard monthly schedule.
Bi-Weekly Mortgage Calculator
Your mortgage
Monthly vs four ways to pay faster
True bi-weekly assumes the lender applies each half-payment the day it arrives and charges interest daily at the rate ÷ 365. The monthly rows charge one-twelfth of the rate on the balance at the start of each month. The first monthly payment falls next month and the first half-payment 14 days from today; every figure is to the cent.
How to use the Bi-Weekly Mortgage Calculator
Enter your current mortgage
Your CURRENT balance (not original loan amount), the interest rate (the note rate, not APR), and the remaining term in years. For a 30-year loan with 5 years already paid, enter 25 years remaining.
Read the bi-weekly half-payment
The tool calculates the standard monthly payment first, then halves it. That's the amount you'd pay every 2 weeks. You're paying the same total cash each year — just split into 26 fortnightly instalments instead of 12 monthly ones.
See years saved + interest saved
The hero number is years off the loan on a true bi-weekly schedule: half the payment every 14 days, each applied when paid. A year has 52 weeks, so that is 26 half-payments, the same as 13 monthly payments instead of 12. The table sets it beside a plan that collects bi-weekly but pays monthly, one-twelfth extra each month, and one extra payment a year.
Check what your lender actually does
Ask whether your lender offers a bi-weekly schedule, and when each payment is credited. You can get nearly the same effect by paying one-twelfth extra each month, or one extra payment a year, as long as the lender applies it to principal. Ask whether any prepayment charge applies before you start.
Bi-weekly mortgage payments — the calendar trick that saves homeowners years
A bi-weekly plan uses a quirk of the calendar. There are 52 weeks in a year, so a payment every two weeks happens 26 times. If each payment is half the monthly amount, you pay the equivalent of 13 monthly payments a year rather than 12. That extra payment goes to principal, and because interest is charged on the remaining balance, it reduces every interest charge that follows.
How much it saves
This calculator runs the schedule payment by payment, to the cent. On a $350,000, 30-year loan at 6.5%, the monthly payment is $2,212.24 and the half-payment $1,106.12. Paid every 14 days and applied when paid, the loan is repaid in 625 half-payments, about 24.0 years, saving about 6.0 years and $105,488 of interest. One-twelfth extra each month ($184.35) saves 5.8 years and $101,797; one extra payment a year saves 5.7 years and $97,981. At 4% a true bi-weekly schedule saves about 4.2 years and $40,628. The higher the rate and the earlier you start, the bigger the saving.
An extra payment only saves interest if your lender applies it to the principal. Ask how it will be applied before you send it.
What the model assumes
Lenders handle bi-weekly payments differently, so the table shows the cases side by side. A true bi-weekly schedule applies each half-payment the day it arrives. A payment programme can instead collect every two weeks and pay the loan monthly: the US Consumer Financial Protection Bureau found that Paymap's "Equity Accelerator" held the collections in a custodial account, paid the mortgage on its original monthly schedule, and sent the extra half-payment from "the two months each year with three biweekly payments" to principal — so any saving came from the higher yearly payment, not from paying more often. On the $350,000 example that still saves about $103,379, because the extra money is the same. What does almost all of the work is the extra payment a year.
Outside the US and Canada
Most housing loans are scheduled monthly. You can reproduce the effect with voluntary extra payments, if your lender accepts them and applies them to principal; HDB, for one, accepts partial capital repayments on its loans. Many loans set limits or charges on early repayment, especially in the first years, so read your loan agreement first. In Singapore, using CPF Ordinary Account savings for extra repayment means giving up the interest the account pays, which the CPF Board sets at 2.5% a year from 1 October to 31 December 2026.
When it is not the best use of the money
Paying a mortgage down early earns you, in effect, its interest rate, with no risk. That is worth less than clearing debt at a higher rate, such as a credit card, and money paid to the lender is hard to get back if you need it, so an emergency fund comes first. If your mortgage rate is low, other uses of the money may earn more, with more risk. Compare the options for your own rates.
Twenty-six half-payments, what they save, and what the model assumes
A year has 52 weeks, so paying every two weeks makes 26 payments: the same as 13 monthly payments.
That is one extra monthly payment a year, and it goes to principal.
On $350,000 over 30 years at 6.5%, a true bi-weekly schedule saves about 6.0 years and $105,488 of interest.
At 4% the same loan saves about 4.2 years and $40,628: the higher the rate, the bigger the saving.
Paying one-twelfth extra each month copies it with a monthly loan: 5.8 years and $101,797 on the same example.
Starting early in the loan saves most, because more of each early payment is interest.
Twenty-six payments across 12 months means two months a year usually contain three payments — the months a held-and-paid-monthly plan sends the extra.
An extra payment only saves interest if the lender applies it to principal, not as next month paid early.
Many loans limit or charge for early repayment, especially in the first years; check before you start.
In Singapore the CPF Ordinary Account pays 2.5% a year from 1 October to 31 December 2026.
Frequently Asked Questions
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Because 26 half-payments a year equal 13 full payments, one more than a monthly schedule. The extra payment reduces the balance, and every later interest charge is calculated on that smaller balance. On a $350,000, 30-year loan at 6.5%, a true bi-weekly schedule repays the loan about 6.0 years sooner.
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Housing loans in Singapore and Malaysia are usually scheduled monthly, so ask your bank. You can get nearly the same effect with voluntary extra payments of one-twelfth of your instalment each month, or one extra instalment a year, if the bank applies them to principal and your loan terms allow it. HDB accepts partial capital repayments on its own loans.
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The two are close, because the extra payment a year does most of the work. Paying in smaller pieces through the year reduces the balance sooner than one lump at the end of each year: on $350,000 over 30 years at 6.5%, a true bi-weekly schedule saves $105,488 and one extra payment a year $97,981. How much you see depends on when your lender applies each payment.
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Check what it costs and what it does. The CFPB found that Paymap's programme charged a $295 enrolment fee and a $2.50 fee on every withdrawal, held the money, and paid the mortgage on its usual monthly schedule; in 2015 it ordered Paymap to refund $33.4 million in fees. You can reproduce such a plan yourself with an extra principal payment each month at no charge. If a programme charges a fee, compare it with the interest the extra payments would save.
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Then the extra saves little or nothing. This is the single biggest pitfall. When you send extra money, the lender has a choice: apply it as principal-only (reduces balance immediately, saves future interest) or apply it as the next month's payment paid in advance (doesn't reduce balance, doesn't save interest). You must explicitly designate "PRINCIPAL ONLY" — in writing, on the payment memo, in your online banking instruction. Check your statement after the first payment to confirm it was applied correctly.
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Possibly. Some loans charge for repaying early or limit how much you can repay without a charge, often during an initial lock-in period. The terms are in your loan agreement; ask the lender if they are unclear, before sending extra payments.
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Paying down a mortgage earns, in effect, its interest rate, with no risk. Investing might earn more or less, with risk. If your mortgage rate is high, early repayment is hard to beat; if it is low, other uses may come out ahead over time. Clear higher-rate debt and keep an emergency fund first.
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Check the CPF and HDB rules for your loan first. The trade-off is the interest your Ordinary Account would have earned, which the CPF Board sets at 2.5% a year for 1 October to 31 December 2026, against the interest you save on the loan. Money taken out of CPF for housing also stops earning in your CPF account.
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As early as you can. Early in a loan most of each payment is interest, so extra principal then saves the most. Started late in the term, the same extra payments still shorten the loan, but by less; enter your current balance and remaining term to see the effect for your loan.
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No. All calculation happens entirely in your browser via JavaScript. Open DevTools → Network and watch — there's zero outbound traffic. Your mortgage balance, rate, and term never leave your device.
Method & sources
How it computes
Monthly M = P·r(1+r)^n ÷ ((1+r)^n − 1), r = rate ÷ 12, schedule in integer cents. True bi-weekly: M ÷ 2 every 14 days, applied when paid, interest = balance × rate × 14 ÷ 365 (rounded), to a zero balance. Compared: collected bi-weekly but paid monthly, the 3rd collection in a month to principal (the CFPB's Paymap finding); M ÷ 12 extra monthly; one extra M a year. Dates from the Singapore business day (MortgageKernel.biweekly).
What this tool implements
- The worked example said $350,000 at 6.5% finishes in about 24.5 years and saves about $90,000. The tool's own simulation gives 24.2 years, 5.8 years and $101,800 saved; the prose now quotes the tool, with 4% as a second case (4.1 years, $39,000).
- The page called the 13/12 model 'identical' to bi-weekly in one place and '1-3% better' in another. It now says what the model assumes and that lender timing can move the result either way.
- Removed as unsourced: an HDB 2.6% rate (HDB pages could not be read), US 'post-2014 no prepayment penalty', $300-500 enrolment fees, Singapore lock-in percentages and regional rate ranges. The CPF Ordinary Account 2.5% (Oct-Dec 2026) is cited to the CPF Board.
- True bi-weekly ASSUMPTION, stated on the page: the lender applies each half-payment the day it arrives and charges simple interest daily at the annual rate ÷ 365, so 26 payments cover 364 days. The first half-payment is 14 days after today (Singapore business day), the first monthly payment next month. All amounts in integer cents; the last payment settles the balance to exactly 0.
- What many programmes actually do, from the CFPB: Paymap's Equity Accelerator held the debits "in a custodial account until the beginning of the month that the consumer's next mortgage payment is due" and, "During the two months each year with three biweekly payments", sent the extra half to principal after its enrolment fee; any saving came from "a higher annual mortgage payment" on the same schedule (consent order 2015-CFPB-0017; press release). The page models that case as its own row.
- Worked figures re-derived from the kernel (start 16 Oct 2026): $350,000 / 6.5% / 30 years → $2,212.24 a month, $1,106.12 half; true bi-weekly 625 payments, about 24.0 years, 6.0 years and $105,488 saved; held and paid monthly $103,379; one-twelfth extra 5.8 years and $101,797; one extra payment a year 5.7 years and $97,981. At 4%: true bi-weekly 4.2 years and $40,628.
Sources
- CPF Board. Earning attractive interest (Ordinary Account rate, 1 October to 31 December 2026). https://www.cpf.gov.sg/member/growing-your-savings/earning-higher…
- Consumer Financial Protection Bureau. Consent order, In re Paymap Inc., 2015-CFPB-0017, ¶11–13 (debits held in a custodial account; extra half-payment in the two three-payment months; $295 enrolment and $2.50 transaction fees). https://files.consumerfinance.gov/f/201507_cfpb_consent-order_pay…
- Consumer Financial Protection Bureau. CFPB Takes Action Against Mortgage Payment Company and Servicer for Deceptive Ads (Paymap to return $33.4 million in fees). https://www.consumerfinance.gov/archive/newsroom/cfpb-takes-actio…
- Housing & Development Board. Payments for HDB Housing Loan (partial capital repayment). https://www.hdb.gov.sg/managing-my-home/finances/loan-matters/pay…
Abridged — the full review record for this tool runs longer than the list above.
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