Biweekly Mortgage Calculator — See Your Real Payoff Date
Enter your loan details and compare a standard monthly schedule with a biweekly schedule side by side: payoff time, total interest, and how much you would save. All results update live as you type.
Calculator
Results
| Year | Standard balance | Biweekly balance |
|---|
How the Biweekly Method Works
A biweekly payment plan splits your regular monthly principal-and-interest payment in half and charges that half every 14 days instead of once per month. Because a year holds 26 two-week periods but only 12 months, you make 26 half-payments — which equals 13 full monthly payments rather than 12. That one extra payment per year goes almost entirely to principal in the early years, which is what compresses the payoff date.
The extra principal each year works out to:
Extra principal per year = (Monthly payment / 2) × 2 − Monthly payment × 12 = Monthly payment / 12
Expanded with the full annual counts: half-payments are collected 26 times a year, so (Monthly payment / 2) × 26 = 13 monthly payments, against the 12 the standard schedule asks for. The surplus is one extra payment a year, and spreading it over the year gives Monthly payment / 12 of extra principal every month. On the default example below, that is $1,516.96 / 12 = $126.41. The calculator simulates the schedule the same way a lender runs it: a payment of half the monthly amount every 14 days, with interest accrued daily at the annual rate divided by 365 across each 14-day period — 26 periods a year.
Biweekly vs Monthly Payments: An Example
Take the default inputs: a $240,000 loan (a $300,000 home with 20% down) at 6.5% interest for 30 years. Run through the calculator, these are the exact numbers:
- Monthly payment (P&I): $1,516.96
- Biweekly payment: $758.48 (half of $1,516.96), paid 26 times a year
- Standard schedule: paid off in 360 months (30 years) with $306,106.77 total interest
- Biweekly schedule: paid off in 288 months (24 years) — 6 years early — with $233,771.29 total interest
- Interest saved: $72,335.48
The first five years of balances, exactly as the calculator's table shows them:
| Year | Standard balance | Biweekly balance |
|---|---|---|
| 1 | $237,317.46 | $235,704.37 |
| 2 | $234,455.26 | $231,121.43 |
| 3 | $231,401.38 | $226,231.97 |
| 4 | $228,142.97 | $221,015.49 |
| 5 | $224,666.35 | $215,450.12 |
After five years the biweekly borrower owes about $9,216 less, and the gap widens every year until the loan is gone six years ahead of schedule.
Is a Biweekly Payment Plan Right for You?
The method tends to fit you well if:
- You are paid every two weeks. Matching your mortgage debit to your paycheck rhythm makes the extra payment feel automatic rather than like a budgeting decision.
- You want a forced savings mechanism. The schedule commits you to 13 payments a year without relying on willpower each month.
- You plan to stay in the home long enough for the interest savings to compound — the payoff compression builds year after year.
It is a poor fit — or at least worth a second look — if:
- Your lender charges for it. Many lender-run or third-party biweekly services charge a setup fee of roughly $300 to $400 plus a per-debit transaction fee, for something you can replicate yourself at no cost.
- Your budget has no slack. Once you are on 26 half-payments, the money leaves every two weeks; if an emergency fund matters more right now, the extra 1/12 of a payment may be better parked in savings.
- You would earn more elsewhere. If your mortgage rate is low and a safe investment or high-interest debt (credit cards, for example) pays or costs more, direct your extra dollars there first.
The free DIY alternative: keep paying monthly, but add 1/12 of your monthly principal-and-interest payment as extra principal each month — or simply make a 13th payment whenever a bonus or third paycheck lands. The math is the same as a lender-run biweekly plan, without the fees.
FAQ
How much faster can I pay off my mortgage with biweekly payments?
For a typical 30-year loan, paying half your monthly payment every two weeks adds one full extra payment per year, which usually pays the loan off about 4 to 6 years early. On the default example used on this page ($240,000 at 6.5% for 30 years), the biweekly schedule pays off 6 years sooner.
Do lenders charge for biweekly payment plans?
Many lenders and third-party servicers charge a setup fee (often $300 to $400) plus a per-transaction fee to administer a biweekly plan. You can get the same mathematical result for free by making the extra principal payments yourself.
Can I just make an extra payment each year instead?
Yes. Paying 13 monthly payments over a year and paying half your monthly payment every two weeks put the same extra money toward principal per year, so the long-run savings are essentially the same. The biweekly rhythm mainly helps because it matches a biweekly paycheck.
Does biweekly payments work with an escrow account?
Yes, but the escrow part (property taxes and insurance) does not change your payoff math. Only the principal and interest portion is affected. If your lender applies a biweekly plan to the full payment, the escrow portion is simply held and paid as usual, so extra principal only builds from the P&I share.
Is a biweekly mortgage calculator accurate?
This calculator uses the standard amortization formula and a period-by-period simulation, so the comparisons are mathematically exact for fixed-rate loans. Your actual payoff can still differ slightly if your lender uses 365-day interest, applies payments on different dates, or charges fees.
Prefer Lump-Sum or Monthly Extra Payments?
If your situation is a fixed monthly amount you can add — or an annual bonus you want to throw at the loan — the Extra Payment Calculator shows the payoff date and interest savings for those patterns instead. To see the two approaches compared head to head on the same loan, read Biweekly vs Extra Payments. The AmortWise homepage lists both tools, and the privacy policy explains what this site does and does not collect.