How Rich Would You Be?
Calculate the exact opportunity cost of waiting to invest. Don't weep at the results.
The Variables
How much could you vividly have saved every month?
The historical average of the S&P 500 is ~8-10%.
The Brutal Reality
If you started at 18, you'd have...
today!
You lost $0 by starting late.
Total Principal Saved
$0
Pure Compound Interest
$0
The True Cost of Waiting to Invest
Enter a monthly contribution, an expected return, and the years you waited — this free calculator shows the wealth you would have today if you had started earlier, side by side with the cost of every delayed year.
Compound growth rewards time more than timing. The results update live in your browser as you adjust the numbers — an eye-opening look at what waiting really costs.
Side-by-side comparison
See your projected wealth if you had started earlier next to the cost of each year of delay, computed with standard compound-growth math.
Live, adjustable inputs
Change the monthly amount, return rate, or start dates and watch the numbers update instantly — everything runs locally in your browser.
Illustrative, not advice
This is a simple compound-growth projection for education — it ignores taxes, fees, inflation, and market risk. It is not financial advice; talk to a qualified advisor for real decisions.
How to use
- Enter your monthly contribution and expected annual return.
- Set the year you started versus the year you could have started.
- Read the wealth difference and the cost of waiting, updating live.
Frequently Asked Questions
How does the calculator work?
It applies the standard compound-interest formula to your monthly contributions over the two time spans, so you can compare starting earlier versus later.
What return rate should I enter?
Use a realistic long-term assumption — many people use 6–8% for a stock-heavy portfolio — and remember it is only an illustration.
Does it account for taxes or inflation?
No. The projection is simplified: it ignores taxes, fees, and inflation, which is why it is educational rather than a financial plan.
Is my data sent anywhere?
No. All calculations run in your browser — your numbers never leave your device.
Is this financial advice?
No. The tool is an educational illustration of compound growth. Consult a qualified financial advisor before making investment decisions.
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