Compound Interest Calculator
Project the growth of savings or investments with compound interest — including regular monthly contributions.
Future value
54,713.58
You invested
34,000
Interest earned
20,713.58
Formula
A = P(1 + r/n)^(nt) + PMT × ((1+r/n)^(nt) − 1) ÷ (r/n)How to use the Compound Interest Calculator
- 1Enter the starting balance and monthly deposit
- 2Enter the annual rate and years
- 3Compare monthly vs yearly compounding
Frequently Asked Questions
What is compound interest?
Interest earned on interest. Each period your interest earns interest too, which makes money grow exponentially over time.
Why does compounding frequency matter?
The more often interest compounds (daily vs yearly), the faster growth — though the difference is small at low rates.