Dollar-cost averaging, explained
What DCA is, what it does and does not do for you, how it compares with investing a lump sum, and the costs that quietly erode it. Not financial advice.
Updated 14 Sept 2026 · Beginner · 2 min read
In short
- Dollar-cost averaging (DCA) means investing a fixed amount on a fixed schedule, whatever the price.
- It removes the pressure of timing the market and smooths your average entry price. It does not guarantee a profit.
- Fees and taxes matter more when you make many small purchases.
How it works
Instead of buying once, you split your investment into equal amounts bought at regular intervals, say $50 every week. When the price is low, the fixed amount buys more; when it is high, it buys less. Your average cost per coin is the total spent divided by the total coins bought.
average cost = total invested ÷ total coins boughtWhat it does for you
- Removes timing decisions. Nobody reliably buys the bottom; a schedule means you do not have to try.
- Softens regret and panic. A falling price becomes a cheaper purchase rather than a signal to sell.
- Fits how people earn. Most people invest from each pay cheque anyway.
What it does not do
DCA does not make a falling asset profitable, and it does not protect you from an asset that never recovers. It also gives up some return when prices rise steadily: studies of stock markets have found that investing a lump sum at once has usually come out ahead of spreading it out, simply because the money spends more time invested. DCA trades some expected return for a lower chance of buying everything at a peak.
Costs that erode it
- Fixed fees hurt small purchases most: a $1 fee on a $20 purchase is 5%. Compare percentage and fixed fees, and consider fewer, larger purchases.
- Spreads (the gap between the buying and selling price) are a hidden cost on many “instant buy” services.
- Taxes: in many countries each purchase is a separate lot with its own cost basis. Keep records; a portfolio with a transaction ledger makes that easier.
Try it on past prices
Our DCA calculator replays a schedule against historical daily prices: how much you would have put in, how many coins you would hold, your average cost and what it would be worth today. Past results do not predict future ones, but they make the trade-offs concrete.