Finance
Biweekly Mortgage Calculator
Paying half your mortgage every two weeks makes 26 half-payments — 13 monthly payments a year, not 12. Enter your loan, rate and term to see the interest saved, the years shaved off, and the biweekly payment.
Your mortgage
The mortgage balance you are financing
$
The annual mortgage rate
%
Years to repay on the standard monthly schedule
years
Interest saved by paying biweekly
$93,997
Paid off 5y 10m sooner
Monthly payment
$2,022.62
Biweekly payment
$1,011.31
Payoff, biweekly
24y 2m
Payoff, monthly
30y
Interest, biweekly
$314,146
Interest, monthly
$408,142
How it works
Paying $1,011.31 every two weeks makes 26 half-payments — the same as 13 monthly payments — so you put one extra $2,023 toward principal each year.
Estimate only. Confirm your lender applies biweekly payments to principal immediately and charges no fee — some hold them and add no benefit.
Try a scenario
No sign-up · Free
The basics
Why biweekly payments save money
The trick is not the timing — it is the extra payment the timing sneaks in. Two ideas explain the whole saving.
26 halves = 13 wholes
One extra payment a year
Twelve months but 26 fortnights: paying half the monthly amount every two weeks quietly adds up to one full extra payment a year, all of it going straight to principal.
An extra $2,023 to principal each year
less balance, less interest
Interest is charged on the balance
Every extra dollar of principal is a dollar the lender can no longer charge interest on. Applied early, when the balance is largest, that compounding saving is substantial.
$93,997 saved on the example loan
Method
How the saving is worked out
Four steps from the monthly payment to the interest saved.
- 1
Find the monthly payment
Start with the normal payment from the level-payment formula, where P is the loan, i the rate over twelve and n the months.
$320,000 at 6.50% → $2,022.62/mo - 2
Halve it for the biweekly amount
The biweekly payment is exactly half the monthly payment, paid every two weeks.
$2,022.62 ÷ 2 = $1,011.31 - 3
Count 26 payments a year
Fifty-two weeks make 26 two-week periods, so you pay the equivalent of 13 monthly payments — one extra straight to principal.
26 × $1,011.31 = 13 × $2,022.62 - 4
Compare payoff and interest
The extra principal each year shortens the term and cuts interest. Compare both schedules to see the saving.
saves $93,997, 5y 10m sooner
Worked examples
Savings across loan sizes
At 6.50% over 30 years. Bigger loans save more, because there is more interest to remove.
| Loan | Biweekly payment | Interest saved | Paid off sooner |
|---|---|---|---|
| $200,000 | $632.07 | $58,748 | 5y 10m |
| $320,000 | $1,011.31 | $93,997 | 5y 10m |
| $450,000 | $1,422.15 | $132,183 | 5y 10m |
| $600,000 | $1,896.20 | $176,244 | 5y 10m |
Where it shows up
When biweekly fits
Three situations where paying every two weeks makes sense.
paid fortnightly
Matching your paycheck
If you are paid every two weeks, a biweekly mortgage lines up naturally — half a payment comes out with each check, so the budget never feels stretched.
Biweekly pay → biweekly mortgage
hands-off saving
Automatic discipline
A biweekly plan builds the extra payment in automatically, so you save interest without having to remember to overpay.
Set it once, save for years
own it sooner
A firm early payoff
For anyone who wants to be mortgage-free earlier, the accelerated schedule brings the payoff date forward by years.
5y 10m off a 30-year loan
Reference
Ways to pay a mortgage down faster
Biweekly is one route; these reach a similar place with different trade-offs.
| Method | Effect | Trade-off |
|---|---|---|
| Biweekly payments | One extra payment a year | Lender must apply it correctly, sometimes a fee |
| Extra 1/12 each month | Identical to biweekly | You must remember, but fully flexible |
| One lump extra a year | Similar, timed once | Needs a spare payment set aside |
| Refinance to 15 years | Big interest cut | Much higher required payment, less flexible |
Worth knowing
Five things before you switch
The savings are real, but only under the right conditions.
check the application
It must hit principal
Some servicers hold half-payments and apply them monthly — no benefit. Confirm each payment reduces principal as it arrives.
watch for fees
Fees can erase the gain
Third-party biweekly programs sometimes charge to enroll and per payment. A free do-it-yourself extra payment beats a fee-laden plan.
do it yourself free
No plan required
Add one-twelfth of a payment to each monthly check, or one extra payment a year, for the same result with full flexibility.
clear costlier debt first
Mind the rate
Overpaying a 6% mortgage while carrying 20% card debt loses money. Pay the highest-rate debt first.
keep a cushion
Liquidity matters
Money sent to the mortgage is hard to get back. Keep an emergency fund before accelerating payoff.
compare to investing
Weigh the alternative
If your investments could reliably earn more than the mortgage rate, investing the extra may beat paying down a cheap loan.
Quick chart
Interest saved by loan and rate
Total interest saved by switching a 30-year loan to biweekly payments — read the row for your balance and the column for your rate.
| Loan | 5% | 6% | 7% | 8% |
|---|---|---|---|---|
| $200,000 | $34,328 | $49,624 | $68,925 | $92,597 |
| $300,000 | $51,492 | $74,436 | $103,388 | $138,895 |
| $400,000 | $68,656 | $99,248 | $137,851 | $185,194 |
| $500,000 | $85,820 | $124,060 | $172,313 | $231,492 |
| $600,000 | $102,984 | $148,872 | $206,776 | $277,791 |
Interest saved over the life of a 30-year loan by paying biweekly instead of monthly.
How we calculate this
The formula and our assumptions
The monthly baseline is the standard loan formula; the biweekly path is simulated.
M = P·i ÷ (1 − (1 + i)^−n)
The monthly baseline
The normal payment on the loan. The biweekly amount is exactly half of it, paid 26 times a year.
per-period rate = APR ÷ 26
The biweekly schedule
We step the balance forward every two weeks at one twenty-sixth of the annual rate, so the payoff date and total interest are exact, not an approximation.
- Assumes every biweekly payment is applied to principal the day it is received.
- Assumes no enrollment or per-payment fee; a real plan may charge one.
- The loan is fixed-rate; adjustable-rate loans are not modelled.
Where to set this up
Setting up biweekly, or refinancing
Rows are ordered by borrower fit, not by any payout. To pay biweekly, start with your current servicer — it is often free. Rates on any new loan are ranges only; get an exact quote.
| Where | Examples | Best for | Pricing |
|---|---|---|---|
| Online marketplace | LendingTree, Credible | Comparing several lenders at once | Market range |
| Your current servicer | Whoever holds your loan | Setting up biweekly for free | No new loan |
| Credit union | Member-owned lenders | Low-fee refinances | Often below market |
| Direct lender / bank | Rocket, Chase | An existing relationship | Market range |
CalculateThis.io is not a lender and does not make credit decisions. When we add lender links they will be marked as sponsored, and we may earn a commission if you apply through one — it does not change the rate you are offered.
Sources
Where the method comes from
- Consumer Financial Protection Bureau — biweekly payment plans and how they are applied.
- Standard amortization formula for a fixed-rate, fully amortizing loan.
FAQ
Common questions
You pay half your monthly payment every two weeks. Because there are 52 weeks in a year, that is 26 half-payments — the same as 13 full monthly payments, one more than the usual 12. That extra payment goes straight to principal, so the balance falls faster and less interest accrues. On a $320,000 loan at 6.50% over 30 years, it saves about $93,997 and pays the loan off 5y 10m early.
It depends on the balance, rate and term. The higher the rate and the larger the loan, the more you save. On the $320,000 example at 6.50%, biweekly payments cut total interest from $408,142 to $314,146 — a saving of $93,997 — and shorten a 30-year loan to about 24y 2m. The chart on this page shows the saving across loan sizes and rates.
Effectively, yes. Paying biweekly is one way to make 13 monthly payments a year instead of 12 — the same as adding one-twelfth of a payment to each monthly check. You can get the identical result by paying an extra $169 a month yourself, with no special plan and full flexibility to stop.
Not every servicer offers a true biweekly plan, and some that do simply hold the half-payments and apply them monthly — which saves nothing. Others charge a setup or per-payment fee that eats the benefit. Before signing up, confirm the payments are applied to principal as they arrive and that there is no fee. If not, make the extra payment yourself.
Sometimes. Third-party biweekly programs may charge an enrollment fee and a small fee per payment. Those fees can quietly cancel out the interest savings. The free way to get the same result is to divide one monthly payment by twelve and add that to each payment yourself, or make one extra full payment a year toward principal.
If your lender applies the payments to principal for free and your budget suits a payment every two weeks — which lines up well with biweekly paychecks — it is a painless way to save interest and own the home sooner. But it ties up cash you cannot easily get back. If you might need flexibility, or could earn more investing the difference, weigh that first.
It can be the wrong priority. Overpaying a mortgage at, say, 6.5% while carrying credit-card debt at 20% costs you money — clear the high-rate debt first. And keep an emergency fund before accelerating a mortgage; money locked in home equity is hard to reach in a pinch.
First the normal monthly payment, M = P·i ÷ (1 − (1 + i)^−n). The biweekly payment is simply half of that — $1,011.31 on the example. You pay it 26 times a year. This calculator simulates the biweekly schedule at a per-period rate of the annual rate divided by 26 for an accurate payoff and interest total.
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Ugo CharlesBuilt and fact-checked against our editorial standards · Last updated June 2026
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