Your money should
be working harder.

Free compound interest calculator. See exactly where your investments end up — no sign-up, no fluff.

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Starting amount
$10,000
Time horizon
20 years
at 7% annually, monthly compounding
You'd end up with
$38,697
including $28,697 in interest
Model your numbers
Recommended brokers — we may earn a commission at no cost to you. Disclosure ›
Best overall
Fidelity
Full-service investing
  • $0 commissions on stocks & ETFs
  • Fractional shares from $1
  • No account minimums
Bonus: $100 when you fund with $50+
Open a Fidelity Account →
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Best for beginners
Robinhood
Simple, mobile-first
  • Instant deposits up to $1,000
  • Crypto & options trading
  • IRA with 3% match (Gold)
Bonus: 1 free stock up to $200
Claim Your Free Stock →
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Best for traders
Tastytrade
Built for options
  • $0 stock commissions
  • $1 to open, $0 to close options
  • Advanced charting & analytics
Bonus: Up to $500 on asset transfer
Start Trading Options →
Sponsored · Terms apply
Best long-term
Vanguard
Index funds & retirement
  • Industry-lowest expense ratios
  • 401k rollovers made simple
  • Investor-owned structure
Bonus: $0 commissions on Vanguard ETFs
Open a Vanguard Account →
Sponsored · Terms apply

Advertiser Disclosure: Yieldora may receive compensation when you click links to financial products. This does not affect our calculator accuracy or editorial independence. Bonus offers subject to broker terms. Rates current February 2026.