Deposit Interest Rate Calculator

Compound Interest Formula:

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

Principal Amount (P):

Annual Interest Rate (r):

Compounding Frequency (n):

Time Period (t):

years

Future Value (FV):

Interest Earned:

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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's often referred to as "interest on interest" and can cause wealth to grow exponentially over time.

2. How Does the Calculator Work?

The calculator uses the compound interest formula:

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

Where:

\( FV \) — Future value of the investment
\( P \) — Principal investment amount
\( r \) — Annual interest rate (in decimal form)
\( n \) — Number of times interest is compounded per year
\( t \) — Time the money is invested for (in years)

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

3. Importance of Compound Interest

Details: Compound interest is a powerful concept in finance that allows investments to grow exponentially over time. Understanding compound interest is essential for retirement planning, savings goals, and making informed investment decisions.

4. Using the Calculator

Tips: Enter the principal amount in dollars, annual interest rate as a percentage, select how often interest is compounded, and the 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 the principal plus accumulated interest.

Q2: How does compounding frequency affect returns?
A: The more frequently interest is compounded, the higher the effective return. Daily compounding yields slightly more than monthly, which yields more than annually.

Q3: What is the Rule of 72?
A: The Rule of 72 is a simple way to estimate how long an investment will take to double: Divide 72 by the annual interest rate. For example, at 6% interest, it takes about 12 years to double your money.

Q4: Are there any limitations to this calculation?
A: This calculation assumes a fixed interest rate and doesn't account for additional contributions, taxes, or fees that might apply to real investments.

Q5: Can this calculator be used for loans as well?
A: While the same mathematical formula applies, this calculator is designed for investments. For loans, you would typically use an amortization calculator.