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What Is Dollar-Cost Averaging (DCA)?
Published May 26, 2026
Dollar-cost averaging (DCA) is an investment strategy where you invest a fixed amount of money at regular intervals — regardless of the asset's price. Instead of trying to time the market with one large purchase, you spread your buying across many smaller purchases over time.
How DCA Works
Suppose you invest $100 in Bitcoin every week for 10 weeks, and the price fluctuates:
| Week | Price | Units Bought |
|---|---|---|
| 1 | $30,000 | 0.003333 |
| 2 | $27,000 | 0.003704 |
| 3 | $32,000 | 0.003125 |
| 4 | $35,000 | 0.002857 |
| 5 | $28,000 | 0.003571 |
| … | … | … |
When prices are low, $100 buys more units. When prices are high, $100 buys fewer. Over time, your average cost per unit is lower than the arithmetic average of prices — because you naturally accumulate more units during dips.
After 10 weeks at $1,000 total invested, you'd own more units than if you bought $1,000 worth of Bitcoin at the average price.
Average Cost Basis
Your average cost basis is total invested ÷ total units acquired. This is the break-even price — if the current market price is above your cost basis, you're in profit; below it, you're at a loss.
DCA typically produces a lower average cost basis than buying all at once at a single point in time, because you buy proportionally more during price dips.
DCA vs Lump Sum
Research (including Vanguard's widely cited study) consistently shows that lump-sum investing — deploying all your capital immediately — outperforms DCA roughly two-thirds of the time in rising markets.
The math is straightforward: if an asset trends upward over time, the sooner you invest, the more time your money has to grow. DCA keeps some of your capital idle while waiting for future purchase dates.
So why use DCA?
- Removes timing risk. Nobody knows if today is a good price or if it will drop 30% next month.
- Reduces regret. A lump sum that immediately falls 40% is psychologically devastating. DCA limits the damage from any single entry point.
- Enables small regular investors. Most people don't have a large lump sum — DCA matches a salary-based savings pattern.
- Works for high-volatility assets. In crypto, where 50%+ drawdowns are common, DCA's lower average cost basis becomes more valuable.
DCA in Bear Markets
DCA genuinely shines during bear markets or periods of sideways price action. If you DCA through a bear market and prices eventually recover, you've accumulated a significant position at low average cost. The investors who stopped buying during the 2018 or 2022 crypto crashes missed the opportunity to lower their cost basis.
How to Use the DCA Calculator
The DCA Calculator lets you model any DCA scenario:
- Set your investment amount and frequency (daily, weekly, bi-weekly, monthly).
- Enter the price when you started and the current price — the calculator linearly interpolates all intermediate purchases.
- See your total invested, average cost basis, portfolio value, ROI, and how the result compares to a lump-sum at your starting price.
Practical Notes
- Trading fees matter. Frequent small purchases accumulate fees. On exchanges with per-trade fees, weekly or monthly DCA is usually more cost-effective than daily.
- Automate it. Most brokers and crypto exchanges offer recurring buy features — automating DCA removes the temptation to skip purchases during downturns, which is exactly when you should be buying.
- DCA is not a guaranteed profit strategy. In a prolonged bear market with no recovery, DCA reduces losses but doesn't eliminate them. Assets must eventually appreciate for DCA to generate returns.