Compound Interest Calculator
Calculate how your money grows with compound interest — final balance and total interest earned.
Final balance
Total interest earned
Frequently Asked Questions
What is compound interest?
Compound interest means the interest you earn is added to your principal, and the next period's interest is calculated on the new, larger balance — so your money grows faster over time (interest on interest).
How is compound interest calculated?
Formula: A = P × (1 + r/n)^(n×t) where P = principal, r = annual rate (as decimal), n = compounding times per year, t = years.
Does compounding frequency matter?
Yes. The more often interest compounds, the higher the final balance — daily compounding grows faster than yearly compounding at the same rate.