Calculate compound interest easily. Free online calculator for investment growth, savings projections, and interest accumulation.
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. It is the most powerful concept in finance, often called the "eighth wonder of the world" because your money grows exponentially over time.
A = P(1 + r/n)^(nt)Where A = Final amount, P = Principal (initial investment), r = Annual interest rate (decimal), n = Number of times interest compounds per year, t = Number of years. The more frequently interest compounds, the more your money grows.
| Input | Output |
|---|---|
| $10,000 at 7% for 10 years, monthly | $20,096.61 (doubles your money!) |
| $5,000 at 5% for 20 years, annually | $13,266.49 |
| $1,000 at 10% for 30 years, monthly | $19,837.40 |