Compound Interest Calculator — Watch Your Money Grow
Discover how compound interest can grow your savings exponentially over time.
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Calculator Inputs
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Key Facts
Updated April 2026
- S&P 500 average annual return: ~10% (historical, before inflation)
- High-yield savings accounts: 4.2-4.8% APY in 2026
- Rule of 72: divide 72 by your return rate to find years to double
- $200/month at 8% for 30 years = $298,000 (you only contributed $72,000)
- Starting 10 years earlier can double your final balance
Pro Tips
Automate your contributions on payday. Money you never see is money you never spend.
Tax-advantaged accounts (401k, IRA, HSA) let your money compound without annual tax drag — use them first.
Do not check your investments daily. Market volatility is noise. Time in the market beats timing the market.
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