Biweekly Mortgage Payment Calculator

Compare biweekly mortgage payments, interest savings and payoff time with monthly and equal-budget monthly plans.

Fixed-rate P&I comparison with 26 credited periods/year; not twice-monthly payments or a dated daily-accrual simulation.

Compare accelerated half-monthly payments every two weeks with standard monthly payments and a monthly plan using the same annual budget.

Result

Biweekly payment$948.10

The biweekly amount is $948.10, with $1,896.20 more annual outlay than standard monthly payments. The matched-budget monthly comparison separates extra principal from earlier payment crediting.

Interest saved versus standard monthly: $88,121.78
Years to payoff with biweekly payments: 24.1538

Result breakdown (12)

Standard monthly payment$1,896.20

Annual biweekly payment budget$24,650.65

Extra annual outlay versus monthly$1,896.20

Years earlier than standard monthly5.8462

Biweekly total interest$294,511.68

Standard monthly total interest$382,633.47

Number of biweekly payments628

Total biweekly payments$594,511.68

Monthly payment with the same annual budget$2,054.22

Matched-budget monthly total interest$295,377.18

Biweekly interest saving versus matched budget$865.49

Matched-budget monthly payoff years24.1667

Remaining loan balance

Remaining principal$0.00

A simplified view of the calculated schedule. Principal after each credited biweekly payment, using 26 equal modeled periods per year. Taxes, insurance and PMI are excluded. Open calculation details for exact values.

Calculation details & assumptions

Fixed-rate principal-and-interest comparison. Half the monthly payment every two weeks creates 26 half-payments per modeled year: 13 monthly payments, not 12. Twice a month is 24 half-payments and does not create that extra annual payment.

The biweekly model assumes immediate crediting with nominal annual interest divided by 26 and equal 1/26-year periods. It is not a dated daily-interest or exact 14-day calendar simulation; actual calendars can have 27 pay dates in a year. A lender holding partial payments until a full monthly payment is due can produce different results.

The matched-budget comparison pays the same annual amount in 12 monthly installments, including one-twelfth of the annual extra outlay. This separates most of the benefit of paying extra from the smaller modeled benefit of earlier crediting.

Final payments are capped at remaining principal plus interest. Payoff years count actual payment periods (26 or 12 per year), not fractional payoff interpolation. No taxes, home insurance, PMI, service charges or prepayment penalties are included. Yearly rows group 26 modeled biweekly payments.

Calculation details

Scroll horizontally or vertically to see more. Download CSV for the complete schedule.

Period	Payment	Interest	Principal	Balance
1	948.10	750	198.10	299,801.90
2	948.10	749.50	198.60	299,603.30
3	948.10	749.01	199.09	299,404.21
4	948.10	748.51	199.59	299,204.62
5	948.10	748.01	200.09	299,004.52
6	948.10	747.51	200.59	298,803.93
7	948.10	747.01	201.09	298,602.84
8	948.10	746.51	201.59	298,401.25
9	948.10	746.00	202.10	298,199.15
10	948.10	745.50	202.60	297,996.54
11	948.10	744.99	203.11	297,793.43
12	948.10	744.48	203.62	297,589.81
13	948.10	743.97	204.13	297,385.69
14	948.10	743.46	204.64	297,181.05
15	948.10	742.95	205.15	296,975.90
16	948.10	742.44	205.66	296,770.24
17	948.10	741.93	206.18	296,564.06
18	948.10	741.41	206.69	296,357.37
19	948.10	740.89	207.21	296,150.16
20	948.10	740.38	207.73	295,942.43
21	948.10	739.86	208.25	295,734.19
22	948.10	739.34	208.77	295,525.42
23	948.10	738.81	209.29	295,316.13
24	948.10	738.29	209.81	295,106.32
25	948.10	737.77	210.34	294,895.99
26	948.10	737.24	210.86	294,685.12
27	948.10	736.71	211.39	294,473.73
28	948.10	736.18	211.92	294,261.82
29	948.10	735.65	212.45	294,049.37
30	948.10	735.12	212.98	293,836.39
31	948.10	734.59	213.51	293,622.88
32	948.10	734.06	214.04	293,408.83
33	948.10	733.52	214.58	293,194.25
34	948.10	732.99	215.12	292,979.14
35	948.10	732.45	215.65	292,763.48
36	948.10	731.91	216.19	292,547.29

How to use this calculator

Compare accelerated half-monthly payments every two weeks with standard monthly payments and a monthly plan using the same annual budget. Enter amounts in the units shown, select the applicable options, and click Calculate. Use Reset to restore the starting values.

Calculation formula

Monthly P&I = P × i / (1 − (1 + i)^−n). Biweekly payment = monthly / 2 + extra. Model rate = annual / 26; matched monthly budget = biweekly × 26 / 12.

Assumptions and accuracy

Review timing, rates, fees and result notes when comparing scenarios. Future returns and rates are assumptions rather than guaranteed outcomes. Monetary display follows the currency’s precision; intermediate calculations retain additional digits.

Choose what to calculate

Biweekly mortgage calculator

Compare 26 half-monthly payments per year with ordinary monthly and equal-budget monthly payments.

Open this calculation

Understanding this calculation

Paying half a monthly payment every two weeks produces 26 half-payments, equal to 13 monthly payments per modeled year. The calculator compares this with ordinary monthly payments and with a monthly plan that has the same annual outlay.

Reading your result

Biweekly payment: Half the normal monthly P&I plus entered extra per biweekly payment.
Extra annual outlay versus monthly: Additional annual cash required by the 26-payment plan.
Matched-budget monthly total interest: A monthly alternative with the same annual payment budget.

Compare two scenarios

Compare standard monthly with 26 credited payments per year.
Compare biweekly with the equal-annual-budget monthly alternative to separate timing from extra principal.

Check before comparing

26 biweekly payments differ from 24 semimonthly payments.
Verify how a servicer credits partial payments and whether fees apply.
The model uses annual rate divided by 26, not daily calendar accrual.

Result explanations checked 2026-10-26 against this calculator’s local model. Model scope and sources appear below.

Worked examples

An extra annual payment without interest

$12,000 principal, zero interest, 12 months remaining, no extra payment above the half-monthly amount.

Monthly payment = 12,000 / 12 = 1,000.
Biweekly payment = 1,000 / 2 = 500; a full-year budget is 500 × 26 = 13,000.
Only 24 payments of $500 are needed to repay $12,000.
There is no interest saving at 0%, even though the modeled loan is repaid earlier.

Biweekly payment is $500, with 24 actual payments and zero interest.

Try these inputs

Same annual budget, monthly alternative

Use the same zero-interest $12,000 example.

The biweekly annual budget is $13,000.
A matched monthly plan pays 13,000 / 12 = 1,083.333333 per month.
Both plans pay extra relative to $1,000 per month; the different period lengths affect the actual last payment.

The matched-budget monthly amount is about $1,083.33.

Try these inputs

Common questions

Is biweekly the same as twice a month?

No. Biweekly is modeled as 26 payments per year; semimonthly is 24. The extra two half-payments account for a large part of accelerated payoff.

Will my servicer immediately credit each half-payment?

Not necessarily. Ask how partial payments are applied and whether there are fees. Holding two halves until the monthly due date changes the timing benefit.

Why include an equal-budget monthly comparison?

It separates paying extra from paying earlier. A monthly extra-principal plan can reproduce much of the saving without enrolling in a biweekly service.

Does this use actual 14-day payment dates?

No. It uses annual nominal rate divided by 26 and equal modeled periods. Real daily accrual, calendar alignment and years with 27 pay dates require the lender’s actual convention.

Scope and assumptions

Fixed nominal-rate P&I with equal 1/26-year periods and immediate crediting of each payment. This is not twice-monthly payment, an exact 14-day daily-interest calendar, or a lender holding-account simulation. Taxes, insurance, PMI, fees and penalties are excluded.

Sources

Calculation notes checked October 26, 2026. Examples are mathematical checks under the stated assumptions.

Calculation methods and formulas

Biweekly vs Monthly