You earn interest ONLY on your original investment.
Formula: Principal × Rate × Time
Example: Invest $10,000 at 7% for 30 years = earn $700/year every year.
🟢 Compound Interest
You earn interest on your original investment PLUS all the interest you've already earned.
Your money snowballs. Interest earns interest earns interest...
Example: Invest $10,000 at 7% for 30 years = earn more each year as the balance grows.
Real Example: $10,000 invested at 7% for 30 years
Simple Interest
$31,000
+$21,000 total gain
Same $700 every year
Compound Interest 🏆
$76,123
+$66,123 total gain
Growing amount each year
💡 Compound interest earns you $45,123 MORE — that's 2.5x the money!
This is why Einstein allegedly called compound interest "the eighth wonder of the world."
💰 Compound Growth Calculator
See how your money grows over time with compound interest
Your Investment Plan
$10,000$0 - $100,000
$500$0 - $2,000
3.0%/yr0% - 15% per year
Assumes you raise contributions annually (e.g., with raises).
7.0%0% - 20%
20 years1 - 40 years
3.0%1% - 8%
Your Results
Future Value
$0
Where your final value comes from
Money you put inGrowth earned
This shows the share of your final result that came from your own contributions versus growth over time. It is not how much money you invested in dollars (that is shown below).