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Amortization Calculator

Compute your monthly mortgage payment and how it splits between interest and principal.

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The Amortization Calculator turns Loan amount, Annual interest rate, Term (years) into Monthly payment, First month interest, First month principal, Total interest, instantly and for free. For instance, with Loan amount = $200,000.00, Annual interest rate = 3.5% and Term (years) = 25 it returns Monthly payment = $1,001.25, First month interest = $583.33 and First month principal = $417.91.

How to use it

  1. Enter your values: Loan amount, Annual interest rate, Term (years).
  2. Read the result instantly: Monthly payment, First month interest, First month principal, Total interest.

Frequently asked questions

How does the Amortization Calculator work?

It takes Loan amount, Annual interest rate and Term (years) and derives Monthly payment, First month interest, First month principal and Total interest from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

3 values: Loan amount ($), Annual interest rate (%) and Term (years). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Loan amount = $200,000.00, Annual interest rate = 3.5% and Term (years) = 25, the calculator returns Monthly payment = $1,001.25, First month interest = $583.33 and First month principal = $417.91. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Loan amount = $400,000.00, Annual interest rate = 3.9% and Term (years) = 50 instead, Monthly payment goes from $1,001.25 to $1,516.43 — which is why it is worth testing a few scenarios rather than trusting a single figure.

Which units should I enter the values in?

Enter Annual interest rate %.

What does it give for smaller values?

Scaled down to Loan amount = $100,000.00, Annual interest rate = 3.1% and Term (years) = 13, Monthly payment comes out at $779.66. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Before making an offer: what the bank will lend, what the purchase costs on top of the price, and how much deposit closes the gap.

What is the most common mistake?

Budgeting for the price and forgetting the acquisition costs. Notary fees, transfer duty and registration add between 2% and 15% depending on the country — enough to sink an offer.

What is the difference between the Amortization Calculator and the ARM mortgage calculator?

This one returns Monthly payment and First month interest; the ARM mortgage calculator returns Initial payment and Max payment after 1st adjustment. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Cap rate calculator is the closest one after this: Compute the capitalization rate of a rental property, and compare it with the market rate of your own comparable sales.

Further reading

All guides →
How-toHow to Read an Amortization ScheduleUnderstand an amortization schedule row by row: how each payment splits into principal and interest, and why early payments are mostly interest.GuideWhen Refinancing a Mortgage Actually Pays: France, Germany, ItalyThe rule of thumb everyone repeats — one point of rate gap — is not a rule and gets the timing wrong. What decides it is how much interest you have not yet paid, and the three countries answer the cost side in three completely different ways. Here is the arithmetic, computed.How-toHow Much Down Payment Do You Need to Buy a Home?How to work out a down payment: typical percentages, the 20% PMI threshold in the US, and how the amount you put down changes your monthly payment.ExplainerIs a Mortgage Overpayment Worth It?See how overpaying a mortgage cuts total interest and shortens the term, and when investing the same money might beat paying the loan down faster.ComparisonFixed vs Variable Rate Mortgage: Which Should You Choose?Compare fixed and variable rate mortgages on certainty, cost, and risk, and see which suits your budget, timeline, and tolerance for change.ExplainerThe Total Cost of a Loan, ExplainedLearn why a loan costs far more than the amount borrowed, how total interest builds over the term, and why a longer term means paying more.