Compound interest is the most powerful force in investing — Einstein called it the eighth wonder of the world. Our calculator shows how your money grows exponentially over time with different compounding frequencies, from annual to daily.
Total Value:
Total Interest Earned:
How to Use This Tool
Enter your initial investment amount.
Enter the expected annual interest rate.
Enter how many years you plan to invest.
Set the compounding frequency (12=monthly, 4=quarterly, 2=semi-annually, 1=annually, 365=daily).
Click Calculate to see your total value and interest earned.
The Formula
Compound Interest Formula: A = P (1 + r/n)^(n*t) where P is principal, r is annual rate, n is compounding frequency, and t is years. More frequent compounding means slightly higher returns.
Why It Matters
You just received a $10,000 bonus and want to grow it over 10 years. You compare a high-yield savings account (4% APY, compounded monthly) versus a low-cost S&P 500 index fund (7% avg return, compounded monthly) to decide where to park your money.