What is compounding?
Compounding is growth that continues to grow on itself, like a snowball effect. When thinking about growth, we often think about it linearly. $100 that earns 10% means my final amount is $110, right? Well, that's only the beginning of the story. In compounding, Year 1, your $100 earns $10. Now you have $110. Year 2, that $110 earns $11. Not $10 again—$11. Because the $10 you earned last year is now also earning. Your money makes money. Then that money makes money too.
See Compounding in Action
Watch how $100 grows over 20 years at a 10% annual return. Click "Play Animation" to see the power of compound interest unfold.
The Power of Compounding
$100 invested at 10% annual return
A simple example
The red blocks are your original $100—your principal. It never changes.
The green blocks are your returns. Watch how they grow each year—not just from your $100, but from the returns you've already earned.
By Year 20, you have $673. That's $573 in returns from just $100 invested. You earned almost 6x your original investment—without adding another dollar.
That's the magic of compounding: time does the heavy lifting.
Let's compare
What if you waited 10 years to start investing? Here's the difference between starting at age 25 vs. 35, both investing $100 at 10% annual return until age 65:
| Start at 25 | Start at 35 | |
|---|---|---|
| Initial Investment | $100 | $100 |
| Annual Return | 10% | 10% |
| Years Invested | 40 years | 30 years |
| Total at 65 | $4,526 | $1,745 |
| Total Returns | $4,426 | $1,645 |
By waiting just 10 years, you lose out on $2,781—more than half your potential wealth. The early years matter most because they have the longest time to compound.
If compounding is so powerful, why doesn't everyone do it?
Because it's boring. And slow. In the early years, the growth feels invisible. Year 1, you earn $10. Year 2, $11. That's not exciting. It doesn't feel like you're getting rich.
But compounding is a back-loaded game. Most of the growth happens in the later years. In our example, you earn more in Year 20 alone ($61) than in the first 6 years combined ($53).
The people who build wealth aren't smarter or luckier—they're just more patient. They start early, stay consistent, and let time do the work.
Key Takeaways
- Compounding means your returns earn returns—your money grows on itself
- Starting early is more important than starting big
- Most of the growth happens in the later years—patience is key
- Time is your greatest asset in building wealth
Want to run your own numbers?
See how your savings could grow with our interactive calculator.
Coming soon