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...

$0

today!

You lost $0 by starting late.

Total Principal Saved

$0

Pure Compound Interest

$0

Share your regrets:

The Magic (and Pain) of Compound Interest

Albert Einstein supposedly called compound interest the "eighth wonder of the world." The concept is simple: you earn interest on your original money, and then you earn interest on that interest. However, the true multiplier of compound interest isn't the amount of money you saveβ€”it's Time.

Because time is the exponent in the compound interest formula, every single year you delay investing drastically reduces your final sum. The "loss" you see in the calculator isn't money you actively spent; it's the invisible opportunity cost of waiting.

Frequently Asked Questions

The calculator uses the standard Future Value of a Series formula. It assumes you make your chosen monthly contribution every single month from your starting age up to your current age, compounding at the selected annual interest rate.
Historically, the S&P 500 has returned an average of 8% to 10% annually before inflation. For conservative estimates, using 7% or 8% is standard practice in financial planning.
This calculator gives you exactly the numeric dollar value. If you want to see exactly what the "purchasing power" would be today, subtract roughly 2-3% from the historical index return rate (e.g., input 6% or 7% instead of 10%).

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