Compound Interest Calculator
Future Value
Total Contributed: $0.00 | Total Interest: $0.00
Understanding Compound Interest
Compound interest is often referred to as the "eighth wonder of the world" because of its ability to exponentially grow your wealth over time. Unlike simple interest, which is calculated only on the principal amount, compound interest is calculated on the principal amount and also on the accumulated interest of previous periods.
How to Use This Calculator
To get the most accurate projection of your investment growth, follow these steps:
- Initial Investment: Enter the amount of money you are starting with today.
- Monthly Contribution: Input the amount you plan to add to your investment each month.
- Annual Interest Rate: Enter the expected annual rate of return (e.g., 7 for a stock market index fund average).
- Time Period: Specify how many you plan to let the money grow.
- Compound Frequency: Select how often the interest is calculated and added to your balance.
The Power of Time
The most critical factor in the compound interest formula is time. The longer you leave your money invested, the more significant the compounding effect becomes. Starting early, even with smaller amounts, often yields better results than starting later with larger amounts.
Frequently Asked Questions
What is the difference between APR and APY?
APR (Annual Percentage Rate) is the simple interest rate, while APY (Annual Percentage Yield) takes compounding into account. This calculator effectively shows you the APY based on your frequency selection.
Why does monthly contribution matter?
Consistent monthly contributions, known as Dollar Cost Averaging, reduce the impact of volatility and ensure you are continuously adding to the principal amount that generates interest.