Come calcolare l’ammortamento: guida completa passo dopo passo

“How to Calculate Amortization: A Complete Step-by-Step Guide”

Amortization refers to the way of paying off a loan by making equal and regular payments towards both the principal amount and the interest. It is the process of spreading out a loan with a fixed repayment term into a series of fixed payments over that period. If you’re looking to take out a loan, it would be helpful to know how your monthly payment is determined, and how much of that payment goes towards the interest versus the principal. Here is a complete guide to help you calculate your loan’s amortization.

1. Determine the Principal Amount

The principal amount is the amount of money borrowed. It is the initial amount of the loan, and the total balance that you will be paying off during the repayment period. This is also the amount used to calculate the interest on the loan. The principal balance is typically the full amount of the loan that is divided into equal payments over the life of the loan.

2. Find the Interest Rate

Interest is the cost of borrowing money. To calculate your monthly payment, you will need to know the interest rate on your loan. This rate is usually expressed as a percentage, and it can be fixed or variable. The interest rate is the percentage that the lender charges on the loan amount for the total repayment period.

3. Determine the Repayment Period

The repayment period is the total amount of time you have to pay off the loan. It is usually expressed in months, and it is the number of payments you will make on your loan. This period can range from a few months to several years, depending on the loan terms.

4. Use the Amortization Formula

Once you have the principal amount, interest rate, and repayment period, you can use the amortization formula to calculate your monthly payment. This formula is:

P = (r * A) / (1 – (1 + r)^(-n))

Where P is the monthly payment, r is the monthly interest rate, A is the loan amount, and n is the total number of payments.

5. Calculate Your Monthly Payment

Once you’ve plugged in all the values into the formula, you can calculate your monthly payment. This payment includes an amount towards the principal and an amount towards the interest. Your payment will remain the same each month, even if the amount going towards interest or principal changes.

6. Determine the Interest Paid

With each monthly payment, a portion goes towards the interest and the rest towards the principal. To determine how much of your payment is going towards interest, subtract the amount of the principal from the total payment. This amount is the interest paid for that month.

7. Determine the Principal Paid

As you continue to pay off your loan, the portion going towards the principal increases while the amount paid towards interest decreases. To determine how much of your payment is going towards the principal, subtract the interest paid from the total payment. This amount is the principal paid for that month.

8. Calculate the Remaining Balance

At the end of each month, the balance of your loan will decrease. To calculate the remaining balance after making your payment, subtract the principal paid from the previous balance. This amount is the new balance of the loan, which will be used to calculate the interest for the next payment.

9. Calculate the Total Interest Paid

The total interest paid is the sum of all the interest payments made over the life of the loan. To determine this amount, multiply the interest paid per month by the total number of payments. This will give you the total interest paid.

10. Double-Check Your Numbers

It’s important to double-check your calculations to make sure that they are correct. Having accurate numbers will help you stay on track with your payments and pay off your loan on time.

In conclusion, calculating your loan’s amortization can seem complicated, but it doesn’t have to be. By following these ten steps, you can easily determine your monthly payment, track how much of it goes towards the principal and interest, and calculate the total interest paid over the life of the loan.


1. Can I use a loan calculator to determine my amortization?
Yes, you can use online loan calculators to determine your monthly payment, interest rate, and total interest paid.

2. How do I calculate the interest rate on a loan?
To calculate the interest rate on a loan, divide the annual interest rate by 12 to get the monthly interest rate in decimal form.

3. Can my monthly payment change over time?
No, if you have a fixed rate loan, your monthly payment will remain the same over the life of the loan.

4. Do I have to pay the same amount of interest each month?
No, the amount of interest you pay each month will decrease as you pay down the principal amount of the loan.

5. Can I prepay my loan to reduce the amount of interest paid?
Yes, you can prepay your loan to reduce the amount of interest paid over the life of the loan. However, some loans may have prepayment penalties, so it’s important to check with your lender before making any additional payments.

Leave a Comment