Scientific Calculator
Trigonometry, logarithms, powers and constants with full expression entry.
Amortization Calculator
Every payment split into principal and interest, with totals.
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| # | Payment | Principal | Interest | Cumulative interest | Balance |
|---|
Payment
—
Total interest—
Total repaid—
Number of payments—
Interest as % of loan—
Quick Tool Overview
The Amortization Calculator builds the full payment schedule for any loan: principal, interest, balance and running totals for every payment, with a yearly summary and support for monthly, bi-weekly and weekly payment frequencies.
- What it does
- Generates a complete amortization schedule for any loan
- You give it
- A loan amount, rate, term and payment frequency
- You get back
- Every payment split into principal and interest, with totals
- Best for
- Understanding where your payments actually go
About the Amortization Calculator
Enter a loan amount, rate and term to produce the full amortization schedule. Every row shows the payment, how much of it clears principal, how much is interest, and the balance left afterwards, with cumulative totals so you can see the cost accumulate.
Amortization is what makes fixed payments possible on a falling balance: the payment stays the same, but its composition shifts month by month from mostly interest to mostly principal. The consequence is that a loan repays very little capital in its early years, which is why the schedule matters more than the payment when you are deciding whether to overpay, refinance, or sell an asset before the term is up.
Key features of the Amortization Calculator
Per-payment and yearly views
Full detail when you need it, an annual summary when you just want the shape.
Bi-weekly and weekly supported
True bi-weekly gives twenty-six half-payments a year — thirteen monthly payments, not twelve.
Extra payments rebuild the table
The schedule recalculates and ends on the payment that actually clears the balance.
Running totals
Cumulative interest and principal columns show the cost accumulating rather than just the monthly slice.
Copyable table
The whole schedule can be copied out if you want it in a spreadsheet.
How to use the Amortization Calculator
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1
Enter the loan
The amount borrowed, the annual interest rate and the term in years or months.
-
2
Pick a payment frequency
Monthly, bi-weekly or weekly, each of which produces a different schedule and total.
-
3
Add extra payments
Optional. The schedule rebuilds around them and ends on the payment that clears the balance.
-
4
Read or export the table
Switch between per-payment detail and a yearly summary, and copy the table if you need it elsewhere.
Frequently asked questions
Spreading a loan over a series of fixed payments so that interest and principal are both covered and the balance reaches zero exactly at the end of the term.
Interest is charged on the outstanding balance. As the balance falls, less of the fixed payment is needed for interest, so more of it goes to principal, and the effect compounds.
When the payment is smaller than the interest due, so the shortfall is added to the balance and the debt grows. Some adjustable loans allowed this historically; it is rare now and worth avoiding.
Yes, if they are true bi-weekly rather than twice monthly. Twenty-six half-payments a year equals thirteen monthly payments rather than twelve, and that extra payment goes entirely to principal.
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