Compound Interest Calculator
Project your investment growth over time with monthly contributions and compound returns. See how your money can work for you.
Compound Interest Calculator
Project your investment growth over time
Total Invested
$0
Final Balance
$0
Interest Earned
$0
How Compound Interest Works
Compound interest is the interest on a loan or deposit calculated based on both the initial principal and the accumulated interest from previous periods. Think of it as "interest on interest" — it's what makes your money grow exponentially over time.
The Formula
A = P(1 + r/n)^(nt)
Key Factors
Principal, Rate, Time, Frequency
Rule of 72
Years to double = 72 ÷ rate
Use our free Compound Interest Calculator to project investment growth with monthly contributions. Plan your retirement, savings goals, and investment strategy with accurate compounding projections. Includes support for monthly, quarterly, and annual compounding frequencies.