Dollar-Cost Averaging (DCA): How It Works and When It Beats Lump-Sum

Dollar-cost averaging (DCA) is the simplest strategy there is: invest the same amount at regular intervals, whatever the price. It removes the impossible job of timing the market and works especially well for volatile assets like crypto.

How DCA lowers your average cost

Because you invest a fixed amount, you automatically buy more units when the price is low and fewer when it is high. Your average cost per unit ends up below the simple average of the prices you paid.

• Month 1: $100 at $50 = 2.00 units
• Month 2: $100 at $25 = 4.00 units
• Month 3: $100 at $40 = 2.50 units
• Total: $300 for 8.5 units → average cost $35.29, while the average price was $38.33

DCA vs lump-sum

Studies of stock markets find that investing a lump sum at once beats DCA roughly two-thirds of the time, simply because markets rise more often than they fall. DCA wins when prices drop after you start. Its real advantage is behavioural: it makes it easier to start and to keep going through crashes.

Setting up a DCA plan

• Pick an amount you can keep investing even in a bad month
• Pick a schedule: weekly or monthly, ideally right after payday
• Automate it with your broker or exchange if possible
• Decide your time horizon (years, not weeks) and stick to it
• Review once or twice a year, not every day

When DCA is not enough

DCA does not protect you from buying something that keeps falling forever. Use it for assets you believe in for the long term, diversify, and keep an emergency fund outside the market.

Common mistakes

• Stopping during a crash, which is when DCA buys the most
• Using money you will need within a year
• Paying high fixed fees on small purchases (check the fee per buy)
• Checking the price daily and second-guessing the plan

Free tools for this strategy

Average cost / DCA calculator · Compound interest calculator · Crypto converter

Frequently asked questions

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