Snowball Your Debt
Mortgage payoff planning

Biweekly Mortgage Calculator With Extra Payments

Compare monthly and biweekly mortgage payments, add extra principal, and estimate the interest and payoff time the changes may save.

Free, no signup No bank login Uses your existing loan
Mortgage details

Enter your loan numbers

Use the balance still left on the mortgage.
Use the rate on your loan statement.
Estimate is fine. If you know the exact payment count left, use the field below.
Optional: match your mortgage statement Exact payment, escrow, PMI, HOA, or extra principal

Use these fields only when you want a closer match to your statement.

Best match: if you know the exact monthly principal and interest from your statement, enter it below. The payoff math will use that number instead of building a fresh estimate from rate and years left.
Do not include escrow, PMI, or HOA in this field.
Example: 347 payments left.
This reduces the payoff balance every month.
Use this for a lump sum you plan to send once.
Included on many lender statements.
Use this for private mortgage insurance or FHA-style monthly mortgage insurance.
This affects budget pressure, not the mortgage balance.

What changes with biweekly?

Monthly plan 12 full payments
Biweekly plan 26 half-payments

That usually adds one extra full payment per year, which can lower interest and shorten the payoff timeline.

Results
Ready when you are Savings: - Time saved: - Total interest: -
Mortgage Coach

Ask about this payoff plan

Ask about extra principal, biweekly payments, interest saved, escrow, or what the numbers mean.

Run the calculator first, then ask a question about the result.
Home affordability

How much house can I afford?

Use this before shopping for a home. It estimates the full monthly housing payment and checks it against income and other monthly debt.

Enter a home price, down payment, rate, income, and debts to see the affordability estimate.
Affordability Coach

Ask about this house payment

Ask whether the payment looks tight, what to adjust, or how down payment, debts, PMI, and income change the picture.

Run the affordability calculator first, then ask a question about the result.

How the math works

1

The calculator finds the regular principal and interest payment from your balance, rate, and term.

2

It compares that monthly plan with half-payments every two weeks.

3

The savings come from making 26 half-payments per year, which equals 13 full payments instead of 12.

The standard monthly plan uses the mortgage payment formula for principal and interest. The biweekly estimate uses half of the standard monthly principal and interest payment every 2 weeks, which equals 26 half-payments per year. That creates the effect of 13 full payments per year. This differs from paying twice a month, which creates 24 half-payments and still equals 12 full payments per year.

Extra monthly principal is added to both plans so the comparison stays fair. Taxes and insurance are shown in the payment estimate, but they do not reduce mortgage principal.

APR is converted into a monthly rate for the amortization estimate. The calculator shows estimated interest and principal movement, but your exact lender statement may differ because of daily interest rules, escrow changes, fees, or how the servicer applies partial payments.

The affordability estimate uses gross monthly income for the debt to income check. It is a planning estimate, not a loan approval. A lender may count income, credit, debts, insurance, taxes, PMI, and loan program rules differently.

Important before you switch to biweekly payments

Ask your mortgage servicer how partial payments and extra principal are applied. Some lenders apply extra principal right away. Others may hold partial payments until a full payment is available. Avoid paid third-party biweekly programs unless you fully understand the fee and can confirm the extra money goes to principal.

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Thinking about buying rather than paying down an existing loan? Read the paycheck-first mortgage affordability guide.

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