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Amortization Calculator

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An amortization calculator estimates your monthly payment and shows how each payment splits between principal and interest over the life of the loan. Enter your loan amount, interest rate, and loan term below to generate a full amortization schedule in seconds.

Whether you're planning a mortgage, auto loan, or personal loan, this calculator helps you see the true cost of borrowing before you commit.

Amortization Calculator

Use the calculator above to estimate your monthly principal and interest payment. You need three inputs:

  • Loan amount: the total amount you plan to borrow
  • Interest rate: the annual rate on the loan (not the APR, which includes fees)
  • Loan term: how many years or months you'll take to repay the loan

Hit calculate and you'll get your estimated monthly payment, total interest paid, and a detailed amortization schedule. The results update instantly if you change any input.

Will using this calculator affect my credit score? No. This is a planning tool that runs math in your browser. It does not pull your credit or connect to any lender.

What types of loans can this calculator handle? Any fixed-rate loan with regular monthly payments. That includes mortgages, auto loans, personal loans, and student loans. It does not model adjustable-rate mortgages, interest-only periods, or balloon payments.

How to Amortize a Loan With This Calculator

Amortization is the process of spreading a loan into equal fixed payments over a set number of months. Each payment covers the interest owed that month, and the rest goes toward the principal balance.

Here's how to amortize a loan step by step with this tool:

  1. Enter the total loan amount you need to borrow.
  2. Enter the annual interest rate your lender quoted.
  3. Choose the loan term in years (or months).
  4. Click calculate to see your monthly payment and full amortization schedule.
  5. Optionally, add an extra payment amount to see how paying extra shortens the loan.

The calculator does the heavy math for you. You get a complete picture of repayment without building a spreadsheet.

Is the interest rate the same as the APR? No. The interest rate is the cost of borrowing the principal. APR includes the interest rate plus lender fees, points, and certain closing costs. This calculator uses the interest rate only. Your actual cost may be slightly higher once fees are included.

Amortization Schedule

An amortization schedule is a table that lists every payment from the first month through the final payoff. For each payment, it shows how much goes toward interest, how much goes toward the principal, and the remaining balance.

The schedule makes one thing clear: early payments are mostly interest. As time passes, more of each payment goes toward reducing your loan balance.

Your Payment Schedule Month by Month

A month-by-month payment schedule reveals patterns that a single monthly payment number cannot.

In month one of a 30-year mortgage at 7% on $300,000, roughly $1,750 of your ~$1,996 payment covers the interest. Only about $246 goes toward the principal. By month 180 (halfway through), the split is close to even. In the final years, nearly the entire payment goes toward principal.

Why is so much of my early payment interest? Interest is calculated on the remaining balance. When the balance is highest (at the start), the interest portion is largest. As you pay down the principal, less interest accrues each month, so more of the same fixed payment goes toward reducing your loan.

Amortization Schedule Calculator for Any Loan Term

Loan term has a major effect on your amortization schedule. A shorter term means higher monthly payments but dramatically less total interest.

Consider a $250,000 loan at 6.5%:

  • 30-year term: ~$1,580/month, ~$319,000 total interest
  • 20-year term: ~$1,864/month, ~$197,000 total interest
  • 15-year term: ~$2,177/month, ~$142,000 total interest

The 15-year loan costs $597 more per month but saves roughly $177,000 in interest over the life of the loan. Use the calculator to test different loan terms with your own numbers.

How does the loan term affect my amortization schedule? A shorter term compresses repayment into fewer, larger payments. Each payment retires more principal, so the interest portion shrinks faster. A longer term keeps payments lower but stretches interest costs across more years.

Monthly Payment and Total Interest

Your monthly payment on a fixed-rate loan stays the same from the first month to the last. What changes is the split between principal and interest inside that payment.

Total interest is the sum of all interest payments over the full loan term. It represents the true cost of borrowing beyond the original loan amount. On a 30-year mortgage, total interest paid can exceed the original loan amount.

How is my monthly payment calculated? The calculator uses a standard formula that factors in the loan amount, monthly interest rate, and total number of payments. The result is a level payment that fully pays off (amortizes) the loan by the end of the term. The formula is explained in the next section.

Amortization Formula Behind the Calculator

The standard amortization formula for a fixed-rate loan is:

M = P × [r(1 + r)^n] / [(1 + r)^n − 1]

Where:

  • M = monthly payment
  • P = loan amount (principal)
  • r = monthly interest rate (annual rate ÷ 12)
  • n = total number of payments (years × 12)

Once you know M, you can build the entire amortization table:

  1. Multiply the remaining balance by the monthly rate to get the interest portion.
  2. Subtract the interest portion from M to get the principal payment.
  3. Subtract the principal payment from the remaining balance.
  4. Repeat for the next month using the new, lower balance.

How do I build an amortization schedule by hand? Follow the four steps above for each month. It works, but for a 30-year mortgage that's 360 rows. The calculator handles it instantly.

This formula assumes fixed payments and a fixed interest rate. It does not account for taxes, insurance, PMI, or adjustable-rate changes.

Extra Payment and Paying Extra on Principal

An extra payment is any amount you pay above your scheduled monthly payment. When that extra goes directly toward the principal, it reduces your loan balance faster. A smaller balance means less interest accrues next month, which creates a compounding savings effect.

You can make extra payments in several ways:

  • Add a fixed amount each month (e.g., $100 extra per month)
  • Make one extra payment per year
  • Make a one-time lump sum payment toward principal

What is the effect of paying extra principal on your mortgage? It shortens the loan term and reduces total interest paid. Even modest extra payments can save thousands over the life of the loan.

Making Extra Payments to Save on Interest

Here's a practical example. On a $300,000 mortgage at 7% for 30 years:

  • No extra payments: pay ~$418,527 in total interest over 360 months
  • $200 extra per month: save ~$118,000 in interest and pay off the loan about 8 years early
  • One extra payment per year: save ~$68,000 in interest and shorten the loan by roughly 4 to 5 years

Use the calculator's extra payment field to model your own scenario. The amortization schedule will update to show the new payoff date and total interest saved.

Do biweekly payments really pay off a loan faster? Yes. Paying half your monthly payment every two weeks results in 26 half-payments per year, which equals 13 full payments instead of 12. That one extra payment per year can shave years off a 30-year mortgage.

How many years will come off my mortgage by paying extra? It depends on your loan amount, rate, and how much extra you pay. Enter your details above to see the exact impact on your schedule.

Mortgage Amortization Calculator

This calculator works as a mortgage amortization calculator for any fixed-rate home loan. Enter your mortgage amount, interest rate, and term to see your monthly principal and interest payment along with a complete amortization schedule.

Keep in mind that your actual mortgage payment may also include property taxes, homeowner's insurance, and private mortgage insurance (PMI). Those costs are not part of the amortization calculation. They are added on top of the principal and interest amount shown here.

What are mortgage points? Points are upfront fees paid to the lender to reduce your interest rate. One point typically costs 1% of the loan amount and lowers the rate by about 0.25%. If you buy points, use the reduced rate in the calculator to see the effect on your amortization schedule.

Mortgage Payment and Fixed-Rate Loan Amortization

A fixed-rate loan keeps the same interest rate for the entire term. That means your monthly principal and interest payment never changes, making budgeting predictable.

With a 30-year mortgage, you make 360 scheduled payments. With a 15-year mortgage, you make 180. The shorter term builds equity faster because a larger share of each payment goes toward principal from the start.

Does my amortization schedule change if the interest rate changes? On a fixed-rate loan, no. The schedule is set when the loan closes. On adjustable-rate mortgages, the rate resets at intervals, which changes the payment and the amortization schedule. This calculator models fixed-rate loans only.

Is an amortization calculator useful for evaluating refinancing options? Yes. Enter the new loan amount, lower rate, and new term to compare the total interest and monthly payment against your current loan. If the savings exceed your closing costs, refinancing may make sense. Consult a mortgage professional for personalized advice.

Loan Amortization for Auto Loans and Personal Debt

The same amortization formula applies to any fixed-rate installment loan, not just mortgages. Common uses include:

  • Auto loans: typical terms of 36, 48, 60, or 72 months
  • Personal loans: often 2 to 7 year terms
  • Student loans: fixed-rate federal or private loans

For an auto loan, enter the amount you're financing (vehicle price minus down payment and trade-in), the annual interest rate, and the loan term. The calculator will show your monthly payment and how much total interest you'll pay.

Shorter auto loan terms (36 or 48 months) carry higher monthly payments but far less total interest than 72-month loans. The amortization schedule helps you see that tradeoff clearly.

For personal debt, the same logic applies. A personal loan at 10% for 5 years on $20,000 costs about $5,500 in total interest. Cut the term to 3 years and total interest drops to roughly $3,200, though the monthly payment rises.

Payment Calculator Estimates and Limitations

This payment calculator provides estimates for planning purposes. Results are based on the inputs you provide and standard amortization math.

What the calculator does not include:

  • Property taxes, homeowner's insurance, or PMI
  • Closing costs or origination fees
  • Variable rate adjustments on adjustable-rate mortgages
  • Prepayment penalties (some loans charge a fee for paying early)
  • Rounding differences your lender may apply

Will an amortization calculator account for additional fees or costs? No. Lender fees, closing costs, and insurance are separate from the amortization of principal and interest. Factor those costs into your overall budget independently.

Your actual payment and total interest may differ from these estimates. Use the results to compare scenarios, understand how amortization works, and prepare for conversations with lenders. For decisions about a specific loan, consult a qualified financial professional.