Compound Interest Calculator

The lump sum you invest today. It compounds for the whole term, so it usually earns more interest than any later deposit of the same size.

The yearly interest rate in percent, as quoted by the bank or lender — enter 5 for 5%.

Even a fraction of a percent compounds into a visible difference over a long term, so it pays to compare offers.

How long the money stays invested. Growth is exponential, so doubling the years far more than doubles the interest earned.

How often earned interest is added to the balance so it can start earning interest itself.

More frequent compounding lifts the effective yearly rate slightly: 5% compounded monthly is worth about 5.12% a year.

The amount you add at the end of every month. Set it to 0 to model a single lump sum growing on its own.