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  1. Home
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  3. Amortization Calculator

Amortization Calculator

Generate a complete amortization schedule for any loan. See how each payment breaks down between principal and interest, and how extra payments can save you money.

By Joseph Orduna·Reviewed April 16, 2026·How this works
Formula:PMT = P × r(1+r)^n / ((1+r)^n - 1)

Amortization Summary

Monthly Payment

$1,580

Principal & Interest

Total Interest

$318,861

Total Payment$568,861
Payments360
Payoff DateMar 2056

Loan Details

Enter loan amount and interest rate

$
%
212
$

Loan Term

Select your loan duration

Principal vs Interest by Year

How your payments are allocated

Balance Over Time

Watch your loan decrease

Amortization Schedule

Complete payment breakdown

#DatePaymentPrincipalInterestBalance
1Apr 2026$1,580$226$1,354$249,774
2May 2026$1,580$227$1,353$249,547
3Jun 2026$1,580$228$1,352$249,318
4Jul 2026$1,580$230$1,350$249,089
5Aug 2026$1,580$231$1,349$248,858
6Sep 2026$1,580$232$1,348$248,625
7Oct 2026$1,580$233$1,347$248,392
8Nov 2026$1,580$235$1,345$248,157
9Dec 2026$1,580$236$1,344$247,921
10Jan 2027$1,580$237$1,343$247,684
11Feb 2027$1,580$239$1,342$247,446
12Mar 2027$1,580$240$1,340$247,206

Extra Payment Impact

See how extra payments save money

+$100/month

Pay off 4 years, 8 months early

Save $58,860

+$250/month

Pay off 9 years, 2 months early

Save $112,596

+$500/month

Pay off 13 years, 9 months early

Save $163,516

+$1,000/month

Pay off 18 years, 6 months early

Save $213,459

Amortization Summary

Monthly Payment

$1,580

Principal & Interest

Total Interest

$318,861

Total Payment$568,861
Payments360
Payoff DateMar 2056

What if you paid extra each month?

See how extra payments reduce your interest and payoff time

$0$0$1,000

Your Amortization Insights

3 insights based on your inputs

High Interest Cost

You'll pay $318,861 in interest (56% of total). Consider extra payments or a shorter term.

Extra Payments Save Big

Adding just $200/month would save you $97,618 in interest.

Consider a Shorter Term

A 15-year mortgage would have higher payments but save significantly on interest.

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Frequently Asked Questions

An amortization schedule is a complete table showing every loan payment broken down into principal and interest portions. It shows how your loan balance decreases over time. Early payments are mostly interest, while later payments are mostly principal.

A table showing each payment split between principal and interest over the loan term.

With amortization, each payment is calculated to be equal throughout the loan term. Early payments have more interest (because the balance is higher), while later payments have more principal. This ensures the loan is fully paid off by the end of the term.

Equal payments with varying principal/interest split. More interest early, more principal later.

Make extra principal payments to reduce the balance faster. Even small extra payments significantly reduce total interest. Pay biweekly instead of monthly (makes 13 payments/year). Refinance to a lower rate if possible. Shorter loan terms also reduce total interest.

Extra payments, biweekly payments, refinancing to lower rate, or shorter term.

Principal is the original loan amount you borrowed. Interest is the cost charged by the lender for borrowing that money. Each payment reduces your principal while also paying the interest owed on the remaining balance.

Principal = amount borrowed. Interest = cost of borrowing. Payments cover both.

Interest is calculated on the remaining balance. At the start, your balance is highest, so more of each payment goes to interest. As you pay down the principal, less interest accrues, so more of each payment goes to principal.

Higher balance = more interest charged. Balance decreases, so interest portion shrinks.

How this works

Full amortization schedule shows the split between interest and principal for every period. Useful for comparing "pay extra principal" strategies — extra payments reduce remaining interest because they come off the balance the next interest charge accrues against.

What this tool can’t do

When to consult a professional

This is a software engineering tool, not financial advice. Run the math here, then take the result to a certified financial planner, CPA, or your bank before making a decision that materially affects your money.

Sources

  1. [1]
    Consumer Financial Protection Bureau (CFPB)
    Official source·consumerfinance.gov·Accessed Apr 21, 2026

    US consumer finance regulator; authoritative on mortgage disclosures, APR rules, credit cards.

Not financial advice

This tool is an educational calculator built by a software engineer, not a licensed financial advisor. Results are informational only. Before making financial decisions, consult a certified financial planner, CPA, or your bank.

Consumer Financial Protection Bureau →

Joseph Orduna
Joseph OrdunaFounder & Software Engineer

Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).

Full bioLinkedIn

Amortization Summary

Monthly Payment

$1,580

Principal & Interest

Total Interest

$318,861

Total Payment$568,861
Payments360
Payoff DateMar 2056