Free compound interest calculator. See how investments grow over time with different compounding frequencies.
Compound Interest Calculator
Compound Interest Formula
A = P(1 + r/n)^(nt)
1
P = Principal (initial investment).
2
r = Annual interest rate as a decimal.
3
n = Compounding frequency per year. t = Time in years.
Frequently Asked Questions
What is the power of compound interest? ▼
Compound interest means you earn interest on your interest. Over long periods, this creates exponential growth — often called "the eighth wonder of the world."