Amortization Calculator

Determine monthly payments, interest paid, and remaining balance for each period, helping you make informed financial decisions. Simplify loan management and gain clarity on your repayment journey.

Amortization Details:
Monthly Payment:
Total Payment:
Total Interest:

On this page:

An Amortization Calculator is a financial tool designed to help individuals and borrowers understand the repayment schedule of a loan. It provides a detailed breakdown of how each loan payment is applied to both principal and interest over the life of the loan. Here's a detailed overview:

Key Components of an Amortization Calculator:

1. Loan Amount:
The total amount of money borrowed.

2. Interest Rate:
The annual interest rate on the loan.

3. Loan Term:

The duration of the loan, often expressed in years.

4. Start Date:

The date when the loan is initiated.

5. Payment Frequency:

How often payments are made (monthly, quarterly, etc.).

6. Calculation Results:

A detailed table or chart showing each loan payment, the amount applied to interest, the amount applied to the principal, and the remaining balance.

Total Interest Paid:

The total amount of interest paid over the life of the loan.

Total Payment:

The sum of all payments made over the life of the loan.

How the Amortization Calculator Works:

The calculator uses the loan amount, interest rate, loan term, and payment frequency to create a schedule of payments over time. The calculations are based on an amortization formula that takes into account both principal and interest. The formula for calculating the monthly payment is:

\[ M = P \times \frac{r(1+r)^n}{(1+r)^n - 1} \]


\( M \) is the monthly payment,
\( P \) is the loan amount,
\( r \) is the monthly interest rate (annual rate divided by 12),
\( n \) is the total number of payments (loan term multiplied by payment frequency per year).

The amortization schedule is then created based on these calculations.

Benefits of Using an Amortization Calculator:

1. Payment Planning:

Helps borrowers plan for future loan payments by providing a detailed schedule.

2. Understanding Principal and Interest:

Illustrates how each payment contributes to both reducing the principal balance and covering interest charges.

3. Loan Comparison:
Allows users to compare the total cost of different loans and see the impact of interest rates and terms.

4. Early Repayment Planning:
Provides insights into the benefits of making additional payments or paying off the loan early.


1. Fixed Rates:

The calculator assumes a fixed interest rate throughout the loan term.

2. Additional Payments:

If the borrower makes extra payments or pays off the loan early, the actual amortization may differ from the calculator's projection.


Let's say you borrow $100,000 with a 4% annual interest rate for 30 years with monthly payments. Using the amortization formula, the calculator generates an amortization schedule that shows each monthly payment, the portion applied to interest, the portion applied to the principal, and the remaining balance after each payment.

In conclusion, an Amortization Calculator is a valuable tool for borrowers to understand the structure of their loan payments. It provides transparency into how each payment contributes to the repayment of both principal and interest, aiding in financial planning and decision-making.

Frequently Asked Questions FAQ

What is the formula for amortization simple?
The formula for amortization, specifically for a simple amortizing loan, involves calculating the periodic payment amount and then breaking down that payment into its principal and interest components. Here is the formula: Amortization Payment (\(M\)): \[ M = \frac{P \times i}{1 - (1 + i)^{-nt}} \] Where: - \( M \) is the monthly payment. - \( P \) is the principal amount (initial loan amount). - \( i \) is the monthly interest rate (annual rate divided by 12). - \( n \) is the total number of payments (loan term in years multiplied by 12). Principal Payment (\(P_{\text{Principal}}\)): \[ P_{\text{Principal}} = M - (B \times i) \] Where: - \( P_{\text{Principal}} \) is the portion of the monthly payment that goes toward reducing the principal. - \( M \) is the monthly payment. - \( B \) is the remaining balance at the beginning of the period. - \( i \) is the monthly interest rate. Interest Payment (\(I\)): \[ I = B \times i \] Where: - \( I \) is the portion of the monthly payment that goes toward interest. - \( B \) is the remaining balance at the beginning of the period. - \( i \) is the monthly interest rate. Remaining Balance (\(B_{\text{New}}\)): \[ B_{\text{New}} = B - P_{\text{Principal}} \] Where: - \( B_{\text{New}} \) is the remaining balance at the end of the period. - \( B \) is the remaining balance at the beginning of the period. - \( P_{\text{Principal}} \) is the principal payment for the period. Example: Let's say you have a $100,000 loan with an annual interest rate of 6%, and the loan term is 3 years. 1. Principal (\(P\)): $100,000 2. Annual Interest Rate (\(r\)): 6% or 0.06 3. Loan Term (\(n\)): 3 years \[ i = \frac{0.06}{12} \] \[ M = \frac{100,000 \times \frac{0.06}{12}}{1 - (1 + \frac{0.06}{12})^{-12 \times 3}} \] Once you have the monthly payment (\(M\)), you can use it to calculate the principal and interest components for each period and update the remaining balance accordingly. Keep in mind that this is a simple amortization formula for loans with fixed interest rates and equal periodic payments. For loans with variable interest rates or other complexities, the formula may differ.
Is amortization based on monthly payments?
Yes, amortization is often based on monthly payments, especially for loans like mortgages and car loans. Amortization is the process of spreading out a loan into a series of fixed payments over time, where each payment includes both principal and interest. In a typical amortizing loan structure: 1. **Monthly Payments:** Borrowers make regular monthly payments over the life of the loan. 2. **Interest Payment:** Each monthly payment covers the interest that has accrued on the outstanding loan balance since the last payment. 3. **Principal Repayment:** The remaining portion of the payment goes toward reducing the loan principal. 4. **Changing Loan Balance:** As each payment is made, the loan balance decreases, and subsequent interest is calculated on the reduced balance. This process continues until the loan is fully paid off. The amortization schedule outlines the details of each payment, showing how much goes toward interest, how much goes toward principal, and the remaining loan balance after each payment. While monthly payments are most common, there are loans with different payment frequencies (e.g., bi-weekly or quarterly). However, monthly amortization is a widely used and easily understandable structure for both borrowers and lenders.

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