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Finance Calculator

Amortization Schedule Calculator

Create an amortization schedule for a fixed-rate loan and see how payments split between principal, interest, and remaining balance. Add an extra payment to test payoff savings.

Live calculator

Amortization inputs

$
%
yrs
$

Scheduled monthly payment

$1,580.17

Payoff time

25 yr 4 mo

Interest paid

$260,001.34

Interest saved

$58,859.89

YearPrincipalInterestBalance
1$4,030.72$16,131.32$245,969.28
2$4,300.66$15,861.38$241,668.62
3$4,588.68$15,573.36$237,079.94
4$4,896.00$15,266.04$232,183.94
5$5,223.89$14,938.15$226,960.05

Rows

Yearly Summary

Inputs

4 Controls

Output

Payoff Path

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What Can You Create?

Create a clear loan repayment path

Yearly payoff summaries

Review how much principal and interest are paid each year without crowding the page with hundreds of rows.

Extra payment savings

Test whether an extra monthly payment reduces total interest and shortens the payoff timeline.

Balance tracking

Watch the remaining balance move down as payments shift from interest-heavy to principal-heavy.

Read the Result

Interpret this calculation before using it

An amortization row divides one scheduled payment between interest and principal. Early rows usually direct more of the payment to interest because interest is calculated from the larger outstanding balance. Later rows direct more to principal. The ending balance is therefore the value to follow when checking where a loan stands after a particular payment.

Worked example

For a $12,000 loan at 6% nominal annual interest with monthly payments over 24 months, the payment is about $531.85. The first month's interest is $60.00, so about $471.85 reduces principal and the balance becomes about $11,528.15. The displayed schedule repeats that calculation using the new balance each month; cents rounding can leave a slightly adjusted final row.

Assumptions to keep

  • Payments are made at the end of each monthly period and the rate stays fixed for the entered term.
  • Extra payments, fees, escrow, late charges, and lender-specific day-count rules are outside this basic principal-and-interest schedule.
  • Printed rows are estimates from the entered assumptions, not a replacement for a lender's statement or payoff quote.

Limits of this result

A real statement can differ when a lender accrues interest daily, changes a variable rate, applies a payment on a different date, or includes financed fees. Use the schedule to understand payment allocation and compare scenarios. For an exact payoff amount, use the dated figure supplied by the loan servicer.

Useful next step: Loan Payment Calculator — Change rate, term, or principal first, then return to the schedule to inspect how the payment allocation changes.

Factual reference:CFPB mortgage loan estimate guidance
Why Users Love This Tool

Loan repayment math that users can actually read

Month-by-month engine

  • The calculator computes the schedule monthly, then summarizes the first yearly rows for a cleaner preview.
  • Scheduled payment, payoff time, total interest, interest saved, and months saved are separated in the result block.
  • Extra monthly payment scenarios are compared against the baseline schedule so the savings are visible immediately.
  • Zero-rate cases are handled as principal-only repayment, keeping edge cases predictable and readable.

Useful context

  • The page explains why early payments are interest-heavy and why later payments reduce principal faster.
  • Mortgage users are directed to the mortgage calculator when they need taxes, insurance, HOA, or escrow estimates.
  • The copy and print actions preserve the exact assumptions behind the schedule for later review.
  • Related links connect users to loan payment and amortization guide content for a complete learning path.
Perfect For

Amortization support for borrowers and teachers

Mortgage borrowers

Understand how the principal and interest part of a home loan changes over time.

Debt planners

Test whether extra payments could reduce interest and shorten a repayment timeline.

Finance lessons

Use the schedule to explain why the same payment can have a changing principal and interest split.

How It Works

How it works in three quick steps.

1

Enter the loan details

Add the loan amount, annual interest rate, repayment term, and optional extra monthly payment.

2

Review the payment split

Use the schedule to see how each year shifts payment dollars between principal and interest.

3

Compare payoff savings

Check the payoff time, total interest, interest saved, and months saved when extra payments are included.

Download & Print

Save, share, and print your amortization schedule

Copy the payoff summary

Save the scheduled payment, payoff time, total interest, and extra-payment savings in one note.

Print the schedule preview

Print the yearly summary and result block for classroom examples or loan planning conversations.

Compare repayment plans

Run baseline and extra-payment scenarios before deciding whether faster payoff fits the budget.

FAQ

Frequently Asked Questions

What is an amortization schedule?
An amortization schedule shows how a fixed loan is repaid over time. Each payment is split between interest and principal. Early payments usually pay more interest because the balance is larger. Later payments usually pay more principal as the balance falls. This calculator summarizes the schedule by year and shows payoff time, total interest, and extra-payment savings.
Why does the interest portion start high?
Interest is calculated from the remaining balance. At the beginning of a loan, the balance is close to the full amount borrowed, so the interest charge is larger. As monthly payments reduce the balance, less interest is charged and more of each payment can go toward principal. This shifting pattern is the core idea behind amortization.
How do extra monthly payments affect the schedule?
Extra monthly payments reduce principal faster, which can shorten the payoff time and reduce total interest. The exact savings depend on the loan amount, rate, term, and size of the extra payment. This calculator compares the extra-payment scenario against the scheduled loan so users can see interest saved and months saved without building a manual spreadsheet.
Can this calculator be used for mortgages?
Yes, it can model the loan repayment portion of a fixed-rate mortgage. It does not include taxes, insurance, HOA dues, PMI, or changing escrow costs. For a monthly housing estimate, use the mortgage payment calculator. For the principal and interest repayment path, this amortization schedule calculator is the better supporting tool.
Does the calculator show every monthly row?
The underlying calculation runs month by month, but the on-page table summarizes the first several years to keep the preview readable on desktop and mobile screens. The yearly rows show principal paid, interest paid, and ending balance. The summary result also shows total interest, payoff time, interest saved, and months saved when extra payments are used.
Is amortization the same as simple interest?
No. Simple interest is a direct formula that multiplies principal, rate, and time. Amortization is a repayment schedule for a loan where each fixed payment covers current interest and reduces principal. Amortization can use a fixed interest rate, but the payment split changes over time as the balance declines. That changing split is why a schedule is useful.
About This Tool

Why amortization schedules make loan cost clearer

A fixed monthly payment can hide what is happening inside a loan. In the first months, much of the payment may go to interest because the balance is still large. Later, as the balance declines, more of the same payment can reduce principal. An amortization schedule makes that change visible. It helps borrowers understand why the payoff balance falls slowly at first, why interest cost depends on time, and why extra principal payments can reduce future interest. Toolarithm's schedule calculator is built to make those patterns readable without forcing users to build a spreadsheet.

The calculator is useful for personal loans, mortgages, auto loans, and classroom finance examples when the loan has a fixed rate and a regular monthly payment. It is not a full servicing system and does not model changing rates, missed payments, fees, escrow adjustments, or lender-specific payment rules. Its purpose is to show the core repayment structure. By pairing a live calculator with a yearly schedule preview, copy and print actions, FAQ content, and links to the amortization guide, the page gives users both a practical output and the context needed to interpret it correctly.

Editorial Transparency

Who maintains this page

Ownership and review

Written and maintained by the Toolarithm editorial team. No review date is shown without a maintained editorial record. No independent professional review is claimed.

Methodology

Formulas are checked with worked examples and boundary cases. Timing, compounding, payment, and rounding assumptions remain visible; results are educational estimates, not financial advice.

Read the editorial methodology

Dates and sources

Review dates change only after a substantive method or content check.

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