Compound Interest Calculator

Plan your long-term investments by calculating compound interest over time.

Principal Amount ($)

Annual Interest Rate (%)

Time (years)

Compounds Per Year

Future Value: $

Interest Earned: $

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About Compound Interest

Compound interest is the process where your investment earns interest on both the initial principal and the accumulated interest over time. It's a key concept for growing wealth long-term.

How It Works

Enter your principal, interest rate, time, and the number of compounding periods per year. The calculator uses the formula:
A = P * (1 + r/n)^(n*t) where P is principal, r is annual interest rate, n is compounding per year, t is years.

Advice

Start early and be consistent. More frequent compounding (monthly vs yearly) slightly increases returns. Consider inflation and taxes when planning long-term.

FAQs

Is this exact? This gives an estimate; actual returns may vary.
Can I use decimals? Yes, both interest rate and principal can have decimals.
What if I add more money later? This tool does not handle additional contributions, only initial investment.