Free calculator

Watch your money grow.

See what your savings could turn into with compound interest, whether you add money every week, every month or once a year.

How to use it

  1. Enter what you’re starting with.
  2. Pick how much you’ll add and how often: weekly, bi-weekly, monthly or yearly.
  3. Set your expected return and slide to how many years you’ll let it grow.
  4. Open More options to raise your deposits each year or see it in today’s dollars.

Your numbers

Sample numbers. Replace them with yours.

$
How often you’ll add money
$

$1,200 a year

%

Before inflation

More options
%
%/yr

Raising your deposit with every raise you get is one of the easiest ways to grow faster.

Your result

After 30 years you’d have

$159,972

You put in$37,000
Interest earned$122,972

The cost of waiting

Waiting just 1 year costs you $13,410.

    How it grows

    Balance by year: starting amount, deposits and interest

    Year-by-year breakdown
    YearPut inInterestBalance
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    The fine print

    Education, not financial advice. This is a simple model to help you see how compounding works. Returns are not guaranteed, and real markets go up and down instead of growing in a straight line.

    How the math works: deposits are added at the end of each week, two weeks, month or year, and interest compounds just as often as you deposit (monthly deposits compound monthly, yearly deposits compound yearly), with interest rounded to the cent each time. If you raise deposits each year, the new amount starts in year two. “Today’s dollars” divides each year’s numbers by the inflation rate you set (0% unless you change it). “The cost of waiting” runs the same plan with the same end date but a 1, 5 or 10 year later start. It leaves out taxes and fees.