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What happens when your money starts earning money?

Compound growth is the quiet engine behind every long-term plan: your money earns, then those earnings start earning too. Here's the good news — time does most of the work, and you can watch it happen below.

Nothing you enter is saved or sent anywhere — the math runs entirely in your browser.

Set to $0 to see the starting amount grow on its own.

A planning assumption, not a promise — no rate of return is guaranteed.

Projected balance in 30 years

$0

You contributed $100,000Growth $259,505
Rule of 72: at 7.0%, money doubles roughly every 10.3 years — about 2 doublings over your 30-year horizon.

Your money, year by year

Projected balance versus contributions over timeStarting with $10,000 and contributing $250 monthly at an assumed 7.0% annual return, the projected balance reaches $359,505 after 30 years, of which $100,000 is contributions.$0$100K$200K$300K$400KYr 0Yr 4Yr 8Yr 12Yr 16Yr 20Yr 24Yr 28Yr 30
BalanceYou contributed

Your next moves (educational, not advice)

  1. Your $250 a month becomes $100,000 of contributions over 30 years — before raising it, check that it captures any employer 401(k) match first.
  2. Growth ($259,505) now outweighs what you put in — time is doing the heavy lifting, and the biggest risk is interrupting it.
  3. Turn on the cost-of-waiting comparison above the chart to see what the same plan looks like starting 5 years later.
Want to talk through your result? It's freeRead: what is financial independence?

WealthChem Compound Growth worksheet — educational estimate only

Starting amount $10,000, contributing $250 per month at an assumed 7.0% annual return for 30 years → projected balance $359,505 ($100,000 contributed, $259,505 growth).

Assumed returns are hypothetical and not guaranteed. Generated by wealthchem.com/tools/compound-growth. Not financial advice.

The formula, in the open

FV = PV(1+r)^n + C × ((1+r)^n − 1) ÷ r Example: $10,000 at 7% for 30 years with no contributions ≈ $76,123
PV: starting amount. C: yearly contributions (your monthly amount × 12). r: assumed annual return. n: years invested. FV: projected future value.

Assumptions

  • Contributions are added once a year and compound annually in this model — many real accounts compound more often
  • The assumed return stays the same every year; real markets move up and down around an average
  • Figures are before taxes and fees, and not adjusted for inflation

Limitations

  • An assumed return is a planning input, not a promise — no rate of return is guaranteed
  • Doesn't model taxes, fees, or pauses and raises in your contributions over time
  • The cost-of-waiting comparison changes only the start date and keeps everything else identical — real life rarely cooperates that neatly

Want the concept behind the math? What is financial independence? The idea this curve is building toward →