# Bi-Weekly Mortgage Payment Calculator: Real Savings, Real Tradeoffs

Canonical: https://themathsays.com/calculators/biweekly-mortgage-payment-calculator/

> Bi-weekly mortgage savings calculator + the simpler alternative that captures the same result for free. Never pay a setup fee for this.

Loan balance ($)

Interest rate (%)

Years remaining on the loan

Bi-weekly program setup fee (if any) ($)

Real number if your servicer charges. Common: $0 (DIY) or $295-$395 (third-party bi-weekly programs).

Per-payment fee (if any) ($)

Some programs charge $2-$4 per bi-weekly payment.

## How this works

26 bi-weekly half-payments per year = 13 full monthly payments per year, one more than the standard 12. That extra payment goes entirely to principal, which cuts years off a long-amortizing loan.

**The simpler alternative that gives you the same result:** make one extra full payment per year. Same math, more flexibility (you choose when, you can skip a year if cash is tight, and you don't need your servicer to participate).

**Never pay for a bi-weekly program.** Third-party servicers charge $295-$395 setup plus $2-$4 per payment to "set up bi-weekly". They're charging you to do something you can do for free. The calculator below shows what those fees cost you.

## The verdict logic

- **✅ Worth doing:** meaningful interest savings AND no fees AND you have the cashflow stability to keep up the schedule.

- **⚠️ Do the simpler version:** a once-a-year extra payment captures most of the savings with more flexibility. Recommended over the formal bi-weekly schedule for most households.

- **❌ Skip the paid bi-weekly program:** if your servicer's bi-weekly setup has fees that consume more than 20% of the interest savings, the program is a bad deal. Either DIY it or make the extra annual payment.

Related

[Pay down vs invest comparison](https://themathsays.com/calculators/pay-off-mortgage-vs-invest-calculator/)
[Refinance to 15-year instead](https://themathsays.com/calculators/30-to-15-year-refinance-calculator/)

## FAQ

Why does bi-weekly save so much money?

You make 26 half-payments per year (52 weeks ÷ 2) instead of 12 full payments. That equals 13 full payments per year, one extra. That single extra payment per year, applied to principal, cuts years off the payoff and thousands in interest. The mechanism is "one extra annual payment," not "more frequent payments."

Can I just make one extra payment per year instead?

Yes, and it gives nearly the same result with more flexibility. The bi-weekly version is the same strategy formalized. The once-a-year version lets you choose when and skip if cash is tight.

Why might my bank charge for bi-weekly payments?

Some servicers offer bi-weekly programs as a third-party service for setup fees ($295-$395) plus per-payment fees ($2-$4). Those fees can eat the savings entirely on smaller loans. Never pay for a bi-weekly program, you can replicate it yourself for free, OR make one extra annual payment for the same result.

Does my lender accept bi-weekly payments?

Most lenders hold bi-weekly half-payments in a suspense account and only apply them as a full payment when both halves are received. The interest savings only work if the half-payment is applied to principal immediately. Check with your servicer before banking on the savings.

What if I have a prepayment penalty?

Most modern US mortgages don't have prepayment penalties, but if yours does, the extra principal payments could trigger it. Read your loan note. Penalty period is usually the first 3-5 years.

Should I just refinance to a 15-year loan instead?

If 15-year rates are 0.5-0.75% below your current 30-year rate AND you can comfortably afford the higher payment, yes, that often saves more total interest than the bi-weekly strategy on the current loan. See our [30-to-15 refinance calculator](https://themathsays.com/calculators/30-to-15-year-refinance-calculator/) to compare.