Mortgage Amortization Calculator

Mortgage amortization is handled by the Amortization Calculator, which estimates scheduled payments, payoff time, total interest, and extra-payment savings.

All tools

Mortgage Amortization Calculator is available as the Amortization Calculator.

This is the same working tool under a different name. Keeping one main version means the formula, examples, FAQs, and guide link do not split into two slightly different pages.

Open Amortization Calculator

Estimate, not advice Payment or total shown Example inputs Tab-only history

Loan amount ($)Interest rate (%)Original term (years)Extra monthly payment ($)

Estimated payoff time295 months

$200,000 at 6% with $100.00 extra/mo

Scheduled payment: $1,199.10
Monthly paid: $1,299.10
Interest saved: $49,138.41
Months saved: 65 months

Formula steps

Calculate the scheduled fixed monthly payment.
Add the extra monthly payment to the scheduled payment.
Simulate monthly interest and principal reduction until the balance reaches zero.
Compare total interest and payoff time with the original schedule.

How to use the Amortization Calculator

Enter the requested dollar amounts, rates, terms, tax settings, or contribution details.
Use rates as percentages, such as 6.5 for 6.5%, and check whether a field asks for a monthly or annual amount.
Press the calculate button to see the answer, supporting metrics, and formula steps.
Use the result as a planning estimate only, then copy it if the assumptions look right.

What people use it for

Estimate how a loan balance pays down over time.

Compare scheduled payoff with extra monthly payments.

Estimate interest saved by paying more than the required amount.

Understand how monthly interest affects principal reduction.

Quick examples

Extra payment

$200,000 at 6%, 30 years, +$100/month

Payoff time and interest saved

No extra payment

$50,000 at 8%, 6 years

Scheduled payoff estimate

Shorter term

$300,000 at 6.5%, 15 years

Faster payoff, lower interest

Need the guide or a nearby tool?

Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.

How to use the Amortization Calculator See slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
Finance Browse related calculators and utilities in the same category.
Mortgage And Home Loan Calculator Hub Compare this with the nearby tools and checks in the same job path.
Calculator and utility guides Find more guides that use real tool inputs and example numbers.
All free tools Search every live tool, converter, calculator, AI helper, and browser utility.

Frequently asked questions

Plain-language answers about when to use the estimate, what your numbers mean, what is left out, and how privacy works.

When should I use the Amortization Calculator?

Use it when you want to test the exact inputs on this page: Estimate how a loan balance pays down over time. Compare scheduled payoff with extra monthly payments. The result is a check against your assumptions, not proof that a lender, tax app, broker, platform, or provider will use the same number.

What do the main Amortization Calculator inputs mean?

Money tools are picky about labels. Dollar fields should be entered as dollar amounts, rate fields should be entered as percentages like 6.5 instead of 0.065, and term fields should match the page label such as months or years. If a field says monthly, do not enter a yearly total unless the tool specifically asks for it.

What is the Amortization Calculator doing with my numbers?

In plain language: The calculator starts with the scheduled amortized payment, then simulates monthly interest and principal reduction with any extra payment you enter. If the result seems too high or too low, first check whether each field expects a monthly amount, annual amount, dollar value, or percent.

How should I read the Amortization Calculator answer?

Start with the headline number, then use the supporting lines to see why the answer moved. For finance calculators, the extra lines often explain interest, tax, fees, principal, payment timing, or totals paid over time. Those pieces matter because two results can look close at first but cost very different amounts later.

What does this estimate leave out?

This calculator gives an educational estimate only. It does not include every fee, lender rule, tax rule, local rate, credit, penalty, or personal financial detail. Real finance decisions can also depend on fees, timing, local rules, credit details, and provider-specific terms.

What should I double-check before copying the result?

Check the rate, time period, compounding or payment frequency, and whether the value is before tax or after tax. A common mistake is mixing monthly and yearly numbers, which can make a finance answer look believable even when it is off by a lot.

Does the site save my finance inputs?

No. The calculator runs in your browser tab. Recent answers stay only on the page while you use it, and they are not sent to a server.