Compound Interest Calculator

Compound Interest Formula:

\[ A = P \times (1 + R / n)^{(n \times T)} \]

Principal Amount (P):

Annual Interest Rate (R):

Compounding Frequency (n):

Time Period (T):

years

Maturity Amount (A):

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1. What is Compound Interest?

Compound interest is the interest calculated on the initial principal and also on the accumulated interest of previous periods. It allows investments to grow exponentially over time, making it a powerful concept in finance and investing.

2. How Does the Calculator Work?

The calculator uses the compound interest formula:

\[ A = P \times (1 + R / n)^{(n \times T)} \]

Where:

\( A \) — Maturity amount (final amount)
\( P \) — Principal amount (initial investment)
\( R \) — Annual interest rate (in decimal form)
\( n \) — Compounding frequency per year
\( T \) — Time period in years

Explanation: The formula calculates how much an investment will grow when interest is compounded at regular intervals over a specified time period.

3. Importance of Compound Interest

Details: Compound interest is fundamental to long-term wealth building. It demonstrates how money can grow exponentially over time, making it crucial for retirement planning, investment strategies, and understanding the time value of money.

4. Using the Calculator

Tips: Enter the principal amount in dollars, annual interest rate as a percentage, select compounding frequency, and time period in years. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between simple and compound interest?
A: Simple interest is calculated only on the principal amount, while compound interest is calculated on both the principal and accumulated interest.

Q2: How does compounding frequency affect returns?
A: More frequent compounding (daily vs annually) results in higher returns due to interest being calculated on interest more frequently.

Q3: What is the Rule of 72?
A: A quick way to estimate how long it takes for an investment to double: 72 divided by the annual interest rate gives the approximate years.

Q4: Can compound interest work against me?
A: Yes, when borrowing money, compound interest can cause debt to grow rapidly if not managed properly.

Q5: Is compound interest taxed?
A: In most jurisdictions, interest earnings are taxable income in the year they are credited to your account.