Use this free Extra Payment Calculator to compare your original loan payoff plan against an accelerated payoff plan with extra payments. The calculator estimates interest saved, time saved, and shows how extra payments can reduce your remaining balance faster.
This page supports three common extra-payment styles: recurring extra payment, annual lump sum, and one-time extra payment. That makes it useful for planning monthly prepayments, using an annual bonus or refund, or testing a one-time principal reduction.
It pairs naturally with the Mortgage Calculator, Loan Calculator, Amortization Calculator, and Debt Payoff Calculator.
Results are intended as practical estimates for fixed-rate amortizing loans and may differ from lender servicing details.
The table below compares the original plan against the accelerated plan. By default, it shows the first 12 rows so you can see how extra payments change the balance trajectory early in the loan.
| Payment # | Original Balance | Accelerated Balance | Original Interest | Accelerated Interest | Extra Payment |
|---|---|---|---|---|---|
| Enter values to generate the comparison schedule. | |||||
An extra payment calculator estimates how adding money beyond the scheduled payment may change payoff time and total interest. Instead of only showing a normal amortization path, it compares that path against an accelerated version of the same loan.
Extra payments usually reduce principal directly. Lower principal means less interest can accrue in future periods, which can shorten the loan and reduce total interest paid.
That is why even relatively small recurring extra payments can have a meaningful effect over time.
Best when you want a steady, repeatable extra amount every payment period, such as adding $100 every month.
Useful when you expect a bonus, refund, or yearly cash event and want to apply one larger extra payment each year.
Useful when you want to test the effect of a single lump-sum principal reduction, such as paying extra in the 12th payment period.
Earlier extra payments often save more interest than the same amount paid later because the principal is reduced sooner.
A borrower adding $100 extra every month to a mortgage or loan may see a shorter payoff time and lower total interest.
Someone using a yearly refund or bonus to make an extra $1,000 payment can compare that approach to smaller recurring extra payments.
A one-time extra payment early in the loan can sometimes save more interest than the same amount paid much later.
Comparing the original plan against the accelerated plan makes it easier to see whether the extra payment strategy is worth it.
An amortization calculator is mainly focused on showing how a standard loan schedule works over time. This page is focused on comparing the standard schedule with an accelerated payoff strategy.
In other words, amortization shows how the loan behaves normally, while this page helps answer the question: what if I pay more?
This Extra Payment Calculator assumes a fixed-rate amortizing loan and does not include prepayment penalties, lender-specific servicing rules, changing rates, or product-specific repayment constraints.
Actual lenders may apply extra payments differently, so this page is intended as a practical estimate rather than an official payoff quote.
Explore other Calc Nest tools that pair naturally with this Extra Payment Calculator.
Extra payments usually reduce principal faster, which can shorten payoff time and reduce total interest.
In many standard loan structures, extra payments are applied toward principal, which lowers the balance faster.
Yes. By reducing the principal earlier, extra payments can reduce future interest accrual.
That depends on timing and amount. Earlier payments often have a stronger effect, but the best approach depends on your cash flow and available funds.
Because they reduce principal sooner, which lowers the balance on which future interest is calculated.
Yes. It is useful for many fixed-rate amortizing loans, including common mortgage and installment loan scenarios.
No. This page does not include prepayment penalties or lender-specific rules unless you factor them into your planning separately.
No. This page is focused on the effect of paying more than scheduled, while an amortization calculator mainly shows the standard loan schedule.
Yes. The page is designed to work on phones, tablets, and desktop devices.