ETF Rebalancing Calculator

Manage US stocks, Korean stocks, and ETFs in one place and auto-rebalance to your target allocation

Real-time US & KR stock prices
Auto buy/sell calculation
Cloud sync supported
Investment Guide

Market Timing vs. Time in the Market

Why staying invested beats trying to time the market, with historical data and evidence.

Many investors attempt to time the market, but research shows that the time you spend in the market is far more important than trying to pick the perfect entry and exit points.

1. The Difficulty of Market Timing

Predicting market tops and bottoms is virtually impossible. Even professional fund managers struggle to get it right consistently. Emotional decision-making dramatically increases the likelihood of costly mistakes.

2. The Cost of Missing the Best Days

Missing just the 10 best trading days over a 20-year period cuts your returns roughly in half.

Missing the 20 best days reduces returns to about one-third.

Missing the 30 best days can turn gains into losses entirely.

3. Time in the Market

Probability of losing money in the S&P 500 by holding period:

1 day: 46%

1 year: 26%

5 years: 10%

10 years: 5%

20 years: 0%

4. Practical Strategies

Dollar-cost averaging (DCA) to invest consistently over time

Automatic rebalancing to maintain your target allocation

Maintaining a long-term investment perspective

Ignoring short-term market volatility

Key Tips

  • View market downturns as buying opportunities rather than reasons to panic
  • Stick to your plan instead of reacting to news headlines
  • Keep only a small cash reserve for opportunistic purchases, not as a defensive move

Apply with the Rebalancing Calculator

Automatically calculate exactly how much to buy and sell to rebalance your portfolio.

Start Rebalancing Calculator

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