Compound Interest Calculator
Calculate how your investment grows with compound interest over time.
About This Tool
The Compound Interest Calculator shows how your money grows over time through the power of compounding. Enter your initial investment, monthly contributions, interest rate, and time period to visualize your wealth accumulation. Ideal for anyone planning long-term savings, retirement funds, or investment portfolios.
How It's Calculated
The compound interest formula is: A = P(1 + r/n)^(nt), where P = principal, r = annual interest rate, n = compounding frequency per year, t = time in years.
For regular monthly contributions (PMT), the future value of an annuity formula is added: FV = PMT × [((1 + r/n)^(nt) − 1) / (r/n)]
Total Amount = Compound growth of principal + Future value of contributions. Total Interest Earned = Total Amount − Principal − Total Contributions. The calculator supports monthly, quarterly, semi-annual, and annual compounding frequencies.
⚠️ Disclaimer
This calculator assumes a fixed interest rate throughout the entire period. Actual investment returns fluctuate and are not guaranteed. Past performance does not indicate future results. Consider consulting a financial advisor before making investment decisions.