Explanation
Enter the initial balance, interest rate, time period, and compounding frequency. Use the additional deposits section if you plan to add money each period.
Compound Interest Calculator
Estimate long-term investment growth with compounding and optional deposits.
Formula
FV = P(1 + r/n)^(nt) + PMT * [((1 + r/n)^(nt) - 1)/(r/n)]
Enter principal, annual return, compounding frequency, contribution amount, and years. The calculator applies standard future value formulas.
- FV: Future value
- P: Initial principal
- r: Annual interest rate
- n: Compounds per year
- t: Years
- PMT: Deposit per period (optional)
Example
$10,000 principal, 8% annual rate, monthly compounding, 10 years
- Convert annual rate to periodic rate (r/n)
- Compute growth of principal over nt periods
- Add annuity future value if recurring contributions are entered
Future value shows invested capital and interest growth separately.