Biweekly Savings Calculator
See what half a payment every two weeks does to your mortgage — 26 payments a year instead of 12 — with the interest saved, the years cut off your payoff, and any servicer fees taken back out.
Figures cover principal and interest only — taxes, insurance and HOA are not included. Results depend on your servicer applying each payment right away. For planning purposes only.
| Plan | Payment | Payoff | Total Interest | Interest Saved |
|---|
For a $320,000 loan at 6.5% over 30 years. Every extra dollar goes straight to principal.
How to use the biweekly savings calculator
Four quick steps show what paying biweekly does to your mortgage — the interest saved and the years cut — with your loan details, a monthly-versus-biweekly comparison, and a downloadable PDF.
Enter your loan
The balance, interest rate, and term of your mortgage or loan.
See the biweekly amount
The calculator halves your monthly payment for the every-two-weeks figure.
Compare schedules
Monthly versus biweekly, side by side, with the extra yearly payment shown.
Read results & save a PDF
See the interest saved, time cut, and a full breakdown you can download.
How the biweekly saving is calculated
The whole trick is in the calendar: a year has 52 weeks, so paying half your monthly amount every two weeks means 26 half-payments — the same as 13 full monthly payments, not 12. That one extra payment is what saves you money. Here is the exact math.
Worked example — a 250,000 mortgage at 5% over 25 years
Monthly: ~1,461 / month × 12 = ~17,538 / year
Biweekly: ~731 every 2 weeks × 26 = ~18,999 / year
The difference: ~1,461 extra = one whole monthly payment
New term: ~21.5 years (about 3.5 years sooner)
≈ paying biweekly saves about 30,000 in interest and clears the mortgage ~3.5 years early.
Biweekly payment charts
Handy lookups for the questions people ask most — savings by loan size, how payment frequency compares, the effect of your interest rate, and the effect of your term. Figures use a 250,000 loan at 5% over 25 years unless noted.
| Loan amount | Interest saved | Time cut |
|---|---|---|
| 150,000 | ~18,300 | ~3.5 years |
| 250,000 | ~30,400 | ~3.5 years |
| 300,000 | ~36,500 | ~3.5 years |
| 400,000 | ~48,700 | ~3.5 years |
| 500,000 | ~60,900 | ~3.5 years |
At 5% over 25 years. The interest saved scales with the loan, while the time cut stays about the same because the extra payment is always one-thirteenth of the year.
| Frequency | Payments/year | Monthly equivalent |
|---|---|---|
| Monthly | 12 | 12 payments |
| Semi-monthly | 24 (half each) | 12 payments |
| Biweekly | 26 (half each) | 13 payments |
| Weekly | 52 (quarter each) | 13 payments |
This is the key distinction: semi-monthly (twice a month) is still 12 payments and saves nothing. Only biweekly (every two weeks) creates the 13th payment.
| Interest rate | Interest saved | Time cut |
|---|---|---|
| 3% | ~12,900 | ~2.7 years |
| 4% | ~20,500 | ~3.2 years |
| 5% | ~30,400 | ~3.5 years |
| 6% | ~43,000 | ~4.0 years |
| 7% | ~58,600 | ~4.5 years |
For a 250,000 loan over 25 years. The higher your rate, the more the extra yearly payment saves — biweekly pays off best on higher-rate loans.
| Loan term | Interest saved | Time cut |
|---|---|---|
| 15 years | ~13,100 | ~1.7 years |
| 20 years | ~20,600 | ~2.5 years |
| 25 years | ~30,400 | ~3.5 years |
| 30 years | ~42,900 | ~4.7 years |
For a 250,000 loan at 5%. Longer terms benefit more, because the extra payment has more years to compound its effect on the balance.
26 payments
13th of the year
interest & time
Biweekly paying is a calendar trick: 26 half-payments quietly add up to one extra payment a year, which turns into real savings.
- 26 payments — half your monthly amount, every two weeks, all year.
- One extra payment — 26 halves equal 13 full payments, one more than 12.
- Savings — that extra goes to principal, cutting years and interest.
Everything the calculator works out
One set of loan details gives you a complete monthly-versus-biweekly picture — the payment, the interest saved, and the time cut.
Key figures behind biweekly paying
Built for any biweekly decision
From a homeowner wanting to finish sooner to a buyer setting up payments on day one, the same calculator shows exactly what biweekly does to the interest and the term.
Wants to shave years off the loan without a big budget change, and to see what switching to biweekly achieves.
- Compare monthly vs biweekly
- Confirm extra goes to principal
- Set up the schedule for free
Gets a paycheck every two weeks and wants mortgage payments that line up naturally with payday.
- Match payments to paydays
- Budget the half-payment
- Use the two extra-pay months
Arranging a new mortgage and deciding whether to start on a biweekly schedule from the very first payment.
- Model biweekly from day one
- Check the lender’s options
- Save the PDF for records
7 tips for biweekly payments
A few informed choices make sure your biweekly plan actually saves money instead of costing you fees.
Biweekly savings calculator FAQ
The saving, how-it-works, semi-monthly, and fee questions people ask most before switching to biweekly payments.
A biweekly mortgage payment means paying half your monthly amount every two weeks instead of the full amount once a month. Because a year has 52 weeks, that’s 26 half-payments, which equals 13 full monthly payments rather than 12.
That one extra payment each year goes straight to the principal, so the balance falls faster. Over the life of the loan this can shorten the term by years and save a large amount of interest.
The saving depends on your balance, rate, and term, but it’s often significant. On a 250,000 loan at 5% over 25 years, switching to biweekly payments can save roughly 30,000 in interest and cut about 3.5 years off the term.
Bigger loans, higher rates, and longer terms produce larger savings. The calculator shows your exact interest saved and time cut from the figures you enter.
You pay half of your normal monthly payment every two weeks. Since there are 52 weeks in a year, you make 26 half-payments, which add up to 13 full monthly payments instead of the usual 12.
The result is one extra full payment each year, applied to the principal. That accelerates how quickly the balance shrinks, which is what shortens the term and reduces the total interest you pay.
No, and the difference matters. Biweekly means every two weeks, giving 26 payments a year; semi-monthly means twice a month, giving 24 payments a year. Semi-monthly is still just 12 full monthly payments, so it doesn’t save extra interest.
Only the biweekly schedule produces the 13th payment that speeds up payoff. If a plan pays twice a month rather than every two weeks, it won’t deliver the biweekly saving.
Sometimes. Some lenders offer biweekly plans for free, but third-party biweekly payment services often charge a setup or per-transaction fee, which can eat into the interest you save.
Before signing up for a paid service, check whether your lender accepts biweekly payments directly, or whether you can achieve the same result yourself at no cost. Paying for a service isn’t necessary to get the benefit.
Usually yes. The simplest free method is to divide your monthly payment by 12 and add that amount to each monthly payment, which makes one extra payment over the year without any special plan.
Alternatively, some lenders let you schedule true biweekly payments at no cost. Either approach captures the saving, so you rarely need a paid biweekly service to get the same outcome.
Not necessarily. Not every lender offers a formal biweekly option, and some hold partial payments until a full monthly payment accumulates rather than applying them immediately, which reduces the benefit.
Check how your lender handles extra and partial payments, and make sure anything extra is applied to the principal. If they don’t offer biweekly, adding a little to each monthly payment achieves the same thing.
For many borrowers it is, because it saves interest and shortens the term with only a small change to cash flow, especially if you’re paid every two weeks. The extra you pay each year is about one monthly payment, spread out.
It’s worth most when your rate is higher and your term is longer. Just confirm there are no prepayment penalties and that extra payments go to principal, and consider whether that money could work harder elsewhere.
General Estimating Notice: This calculator estimates the interest saved and time cut from switching to biweekly payments using the balance, interest rate, and term you enter, assuming a standard repayment loan and that extra payments are applied to principal. Results are illustrations, not a quote or financial advice, and don’t account for rate changes, lender or third-party fees, how your lender applies partial payments, or prepayment penalties. Check your loan terms and consider a qualified, regulated financial adviser before changing your payment schedule. For planning purposes only.