Compound Interest Calculator

Project investment growth with compounding interest and optional regular contributions.

Initial deposit

Annual rate (%)

Years

Monthly contribution

Compound frequency

Future value

—

Total contributions

—

Total interest earned

—

Ending principal

—

Multiplied by

—

Albert Einstein allegedly called compound interest "the eighth wonder of the world." Start early — time matters more than rate.

Formula

Future value with periodic contributions: FV = P(1+r/n)^(n·t) + C·[((1+r/n)^(n·t) − 1) / (r/n)]. Where P = principal, r = annual rate, n = compounds per year, t = years, C = contribution per compound period.