Dollar-Cost Averaging Calculator
Compare lump sum investing vs dollar-cost averaging with historical S&P 500 data
Calculator
Overview
The DCA Calculator shows how investing a fixed amount at regular intervals performs over time, compared to investing a lump sum all at once.
Most people delay investing because they fear buying at the wrong time. DCA eliminates this problem by spreading purchases across market highs and lows, averaging your cost basis.
Enter your monthly investment amount, time period, and expected annual return. The calculator shows total invested, ending balance, and comparison with lump sum investing.
How It Works
Formula
DCA Balance = Sum of each monthly investment * (1 + r/12)^(remaining months). Lump Sum = Total Amount * (1 + r/12)^(total months).Variables
- Monthly Amount: Fixed amount invested each month
- Time Period: Total investment duration in years
- Annual Return: Expected average annual return
- Lump Sum: Total amount if invested all at once (for comparison)
Best Practices
- Automate monthly investments (remove decision fatigue)
- Use the same day each month (e.g., payday)
- Never stop during market dips (that is when DCA works best)
- Invest in broad index funds for DCA
Frequently Asked Questions
Is DCA better than lump sum?
Historically, lump sum wins 68% of the time because markets trend upward. But DCA is psychologically easier and prevents the worst-case scenario of investing everything at a market peak. If you have a lump sum, invest it. If you earn monthly, DCA is natural.
How much should I invest monthly?
Financial advisors recommend 15-20% of gross income for retirement investing. Even $100/month grows to $188K over 30 years at average market returns.
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