Biweekly Mortgage Calculator
See how biweekly payments can help you pay off your mortgage faster and save on interest
How Biweekly Payments Work
Instead of making 12 monthly payments per year, biweekly payments split your monthly payment in half and pay it every two weeks. Since there are 52 weeks in a year, you make 26 half-payments, which equals 13 full monthly payments instead of 12.
Step 1
Divide your monthly payment by 2
Step 2
Pay that amount every 2 weeks
Step 3
Make 26 payments per year (13 full payments)
This extra payment per year goes directly toward your principal, significantly reducing the total interest paid over the life of the loan and shortening your payoff timeline.
Calculate Your Biweekly Savings
Benefits of Biweekly Payments
Pay off your mortgage years earlier
Typically 5-7 years faster on a 30-year mortgage
Save thousands in interest
The extra payment reduces principal faster
Build equity faster
More of each payment goes to principal
Easier budgeting
Aligns with biweekly paychecks
Frequently Asked Questions
Do all lenders accept biweekly payments?
Not all lenders offer true biweekly payment programs. Some may hold payments until the full monthly amount is received. Check with your lender about their specific policies.
Are there fees for biweekly payments?
Some lenders or third-party services charge setup or transaction fees. You can achieve similar results by making one extra monthly payment per year or adding 1/12 of your payment to each monthly payment.
How much can I really save?
On a $300,000 30-year mortgage at 6.5%, biweekly payments can save over $100,000 in interest and pay off the loan about 6 years earlier.
Important Disclaimer
This calculator is for educational purposes only. Actual savings depend on your specific loan terms and lender policies. Some loans may have prepayment penalties. Always consult with your lender before changing your payment schedule.
How Biweekly Mortgage Payments Work
With a standard mortgage, you make 12 monthly paymentsper year. Switch to biweekly payments and you make a half-payment every two weeks — that's 26 half-payments, which equals 13 full monthly paymentsper year. That one extra payment goes entirely toward principal, and that's the entire secret behind the dramatic interest savings.
Because mortgage interest is calculated on your outstanding balance, every dollar of extra principal you pay today reduces the interest you owe for every remaining month. The effect is compounding — early extra payments are worth far more than late ones.
The Math (Plain English)
- Monthly payment formula:
M = P × [r(1+r)^n] / [(1+r)^n − 1] - Biweekly payment = Monthly ÷ 2, paid every 2 weeks
- Annual total: 26 × (M/2) = 13M vs. 12M monthly
- Extra per year: 1 full payment applied to principal
Example: $350,000 loan at 6.5% for 30 years → monthly payment ≈ $2,212 → biweekly = $1,106 × 26 = $28,756/year vs $26,544 monthly → $2,212 extra principal annually.
Biweekly vs Monthly: Savings by Loan Size
| Loan Amount | Rate | Monthly Payment | Biweekly Payment | Interest Saved | Years Saved |
|---|---|---|---|---|---|
| $200,000 | 6.0% | $1,199 | $600 | $26,000+ | 4.5 years |
| $350,000 | 6.5% | $2,212 | $1,106 | $56,000+ | 5 years |
| $500,000 | 7.0% | $3,327 | $1,664 | $96,000+ | 5.5 years |
Biweekly vs Monthly Payments: Full Comparison
Biweekly Advantages
- ✓ Pay off loan 4–6 years early
- ✓ Save $26,000–$96,000+ in interest
- ✓ Builds equity faster
- ✓ Aligns with biweekly paychecks
- ✓ No refinancing required
Watch Out For
- ⚠ Bank biweekly programs often charge $200–$400 setup + monthly fees
- ⚠ Less cash flow flexibility vs monthly
- ⚠ Some lenders don't support true biweekly — they hold payments until month-end
- ⚠ DIY (extra 1/12 each month) achieves same result without fees
Pro tip: Instead of paying your bank for a biweekly program, simply divide your monthly payment by 12 and add that amount to each monthly payment. You achieve identical savings — one extra principal payment per year — with zero setup fees.
Step-by-Step: How to Use This Biweekly Mortgage Calculator
- 1Enter your original loan amount — the full principal when the loan was originated, not your current balance.
- 2Enter your interest rate — use your note rate (the rate on your loan documents), not APR.
- 3Enter loan term — typically 30 or 15 years. If mid-loan, enter remaining years.
- 4Click Calculate — the calculator instantly shows both monthly and biweekly scenarios.
- 5Review the comparison — see total interest saved, months eliminated, and the full amortization schedule.
- 6Download your schedule — export to CSV or PDF to share with your lender or financial advisor.
More Frequently Asked Questions
Is making biweekly payments the same as making one extra monthly payment per year?
Effectively, yes. Both strategies result in 13 full monthly payments per year instead of 12, with the extra payment applied to principal. The biweekly schedule distributes this extra payment across the year in smaller increments, which can be easier to manage cash flow-wise.
Do all lenders offer biweekly payment plans?
No. Many lenders only accept monthly payments. Some offer biweekly programs for a fee. The DIY alternative — adding 1/12 of your payment to each monthly payment — works with any lender and costs nothing.
What's the catch with bank-run biweekly programs?
Many banks charge $200–$400 upfront plus monthly processing fees of $2–$5. Worse, some don't actually apply payments biweekly — they hold them in escrow and apply only monthly, eliminating the interest benefit entirely. Always confirm your lender applies payments immediately upon receipt.
Should I do biweekly payments or invest the extra money instead?
This depends on your mortgage rate vs. expected investment returns. At 6.5%+ mortgage rates, paying down your mortgage offers a guaranteed 6.5% return. If your rate is below 4%, investing in a diversified portfolio may produce higher long-term returns. Consider your risk tolerance and tax situation. Consult a financial advisor for personalized guidance.
Can I switch to biweekly payments on an existing mortgage?
Yes. You can start at any point in your loan term — the earlier the better, since more interest remains to be saved. Simply contact your lender to ask about biweekly options, or implement the DIY strategy of adding 1/12 extra to each monthly payment and designating it for principal reduction.
Ready to explore more strategies? Try our extra payment calculator to model one-time lump sum payments, or use the mortgage payoff calculator to compare full payoff scenarios. You can also evaluate whether refinancing makes more sense than extra payments at your current rate.