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Printed July 8, 2026 · https://trycleartally.com/biweekly-mortgage-calculator
Estimates for educational purposes only — not financial advice. See https://trycleartally.com/disclaimer.
Biweekly Mortgage Calculator
See how switching to biweekly mortgage payments — half your monthly payment every two weeks — moves up your payoff date and how much interest it saves.
Reviewed by the ClearTally editorial team · Last updated July 8, 2026 · Methodology & sources
For an existing loan, enter your current balance and years remaining.
Biweekly payment
$1,011.31
Half your $2,022.62 monthly payment, paid every two weeks
Time saved
5 yrs 10 mo
Interest saved
$93,997
Biweekly payoff time
24 yrs 2 mo
vs 30 yrs 0 mo paying monthly
Total interest, monthly plan
$408,142
Total interest, biweekly plan
$314,146
Extra paid per year
$2,023
26 half-payments = 13 full payments a year
Monthly vs. biweekly payoff
The gap between the lines is the extra full payment each year going straight to principal — the sooner the green line hits zero, the less total interest you pay.
Assumes an accelerated biweekly plan: half your monthly payment every two weeks, with each half-payment applied immediately and interest accruing per two-week period. Lender programs vary — some hold funds and pay monthly, which saves less. Principal & interest only; taxes and insurance not included. Estimate only, not financial advice.
Biweekly Mortgage Worksheet
Biweekly payment
$1,011.31
Accelerated biweekly estimate (26 half-payments a year), principal & interest only. Lender biweekly programs vary. Not financial advice.
Balance by year (monthly vs. biweekly)
| Year | Monthly-plan balance | Biweekly-plan balance |
|---|---|---|
| 1 | $316,423 | $314,331 |
| 2 | $312,607 | $308,281 |
| 3 | $308,535 | $301,826 |
| 4 | $304,191 | $294,938 |
| 5 | $299,555 | $287,588 |
| 6 | $294,609 | $279,745 |
| 7 | $289,332 | $271,375 |
| 8 | $283,701 | $262,445 |
| 9 | $277,694 | $252,915 |
| 10 | $271,284 | $242,747 |
| 11 | $264,444 | $231,896 |
| 12 | $257,147 | $220,317 |
| 13 | $249,361 | $207,962 |
| 14 | $241,053 | $194,778 |
| 15 | $232,189 | $180,710 |
| 16 | $222,732 | $165,698 |
| 17 | $212,641 | $149,680 |
| 18 | $201,874 | $132,587 |
| 19 | $190,386 | $114,347 |
| 20 | $178,129 | $94,884 |
| 21 | $165,051 | $74,116 |
| 22 | $151,097 | $51,955 |
| 23 | $136,208 | $28,307 |
| 24 | $120,323 | $3,073 |
| 25 | $103,373 | $0 |
| 26 | $85,289 | $0 |
| 27 | $65,993 | $0 |
| 28 | $45,405 | $0 |
| 29 | $23,438 | $0 |
| 30 | $0 | $0 |
Calculated using the standard formulas described at https://trycleartally.com/methodology — for educational estimates only, not a quote or financial advice. Verify with your lender or financial institution before making decisions.
Prefer a fixed extra amount instead of a schedule change? The mortgage payoff calculator shows what any extra monthly payment saves, and the mortgage calculator breaks down your full monthly payment including taxes and insurance.
How it works
The trick is in the calendar: a year has 52 weeks, so paying every two weeks means 26 half-payments — the same as 13 full monthly payments instead of 12. That extra payment each year goes entirely to principal. We run your loan on two schedules — the standard monthly one, and a biweekly one where each half-payment lands every two weeks and interest accrues per period — then compare the payoff dates and total interest.
One caveat worth knowing: this models a true acceleratedbiweekly plan, where every half-payment reduces your balance the day it arrives. Some lender and third-party programs collect biweekly but only apply funds once a month, which saves noticeably less. The results here are principal and interest only — taxes and insurance don't change with your payment schedule.
Example: on a $320,000 loan at 6.5% for 30 years, the monthly payment is about $2,023, so the biweekly payment is about $1,011. Paid every two weeks, the loan is gone in roughly 24 years 2 months instead of 30 — about 5 years 10 months sooner — and total interest drops from about $408,000 to about $314,000, saving roughly $94,000.
Sources & further reading
FAQ
Because a year has 52 weeks, paying half your monthly payment every two weeks means 26 half-payments — the equivalent of 13 full payments instead of 12. You make one extra full payment a year without feeling it, and all of it goes to principal. On a typical 30-year loan that shaves off roughly 4 to 6 years, with bigger savings at higher interest rates.