Calculate Interest On Investment Formula

Compound Interest Formula:

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

Principal Amount (P):

Annual Interest Rate (R):

Compounding Frequency (n):

Time Period (T):

years

Maturity Amount (A):

Interest Earned (I):

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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:

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

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
\( I \) — Interest earned

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

3. Importance of Compound Interest

Details: Compound interest is fundamental to long-term wealth building. It demonstrates how small, regular investments can grow significantly over time due to the compounding effect, often referred to as "the eighth wonder of the world."

4. Using the Calculator

Tips: Enter the principal amount, 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 principal and accumulated interest.

Q2: How does compounding frequency affect returns?
A: More frequent compounding (daily vs annually) results in higher returns due to more frequent interest calculations and additions to the principal.

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 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 this calculator accurate for real investments?
A: This provides a mathematical estimate. Real investments may have fees, taxes, and variable rates that affect actual returns.