401(k) Compound Interest Calculator
See how your 401(k) contributions and employer match grow through the power of compound interest over time.
Personal Details
401(k) Details
Investment Returns
Compound Growth Score
Excellent compound growth — your money is working hard for you.
Final Balance
$2,069,895
Compound Multiplier
3.27x
Final Balance
$2,069,895
at age 65
Your Contributions
$494,959
total invested
Employer Match
$112,488
free money
Interest Earned
$1,548,022
compound growth
401(k) Balance Growth
How your balance grows through compound interest over time
Contributions vs. Compound Growth
What you put in vs. what compound interest earned — shown every 5 years
Where Your 401(k) Comes From
Breakdown of your final balance by source
Total
$2,180,469
Your Contributions
23%$494,959/yr
Employer Match
5%$112,488/yr
Compound Interest
71%$1,548,022/yr
Starting Balance
1%$25,000/yr
Year-by-Year Breakdown
Detailed numbers for every year
| Age | Balance | Your Contrib. | Match | Interest | Fees |
|---|---|---|---|---|---|
| 30 | $25,000 | - | - | - | - |
| 35 | $95,633 | $8,118 | $2,435 | $6,286 | $449 |
| 40 | $198,795 | $8,963 | $2,689 | $13,066 | $933 |
| 45 | $347,189 | $9,896 | $2,969 | $22,820 | $1,630 |
| 50 | $566,277 | $18,426 | $3,278 | $37,220 | $2,659 |
| 55 | $912,536 | $19,563 | $3,619 | $59,979 | $4,284 |
| 60 | $1,396,433 | $20,819 | $3,996 | $91,784 | $6,556 |
| 65 | $2,069,895 | $22,205 | $4,412 | $136,049 | $9,718 |
Personalized Insights
Actionable recommendations based on your numbers
Your money multiplied 3.27x
Through compound interest, every dollar you put in grew to $3.27. The longer your time horizon, the more powerful compounding becomes.
Interest exceeds all contributions
You earned $1,548,022 in compound interest — more than the $607,447 total contributed. Compound interest is doing the heavy lifting.
$112,488 in free employer match
Your employer contributed $112,488 over the period. That's free money that also earns compound interest.
$110,573 lost to fees
Fund fees of 0.5% cost you $110,573 over the period. Switching to low-cost index funds (0.03-0.10%) could save tens of thousands.
~$6,900/month using the 4% rule
A $2,069,895 balance could provide approximately $6,900/month in retirement income using the 4% safe withdrawal rate.
Catch-up contributions start at age 50
At age 50, you can contribute an extra $7,500/year to your 401(k). This is factored into your projection.