Compound Interest Calculator

See how your investment grows over time with the power of compounding.

$
$
%
years
Final Balance $0
Total Contributions $0
Total Interest Earned $0

Growth Over Time

Contributions Interest

Year-by-Year Breakdown

Year Contributions Interest Balance

How Compound Interest Works

Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, which only earns returns on the original amount, compounding lets your money grow exponentially over time. The more frequently interest compounds, the faster your balance grows.

The formula used is A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)], where P is the principal, r is the annual rate, n is the compounding frequency, t is the number of years, and PMT is the regular contribution. This calculator supports monthly, quarterly, annual, and daily compounding frequencies.

Consistent monthly contributions have a dramatic effect on long-term growth. Even small regular deposits can outpace a large one-time investment over decades, thanks to the power of compounding. Use the chart and table below to explore how different contribution levels and interest rates affect your projected balance.