How recurring purchases work
Someone following a DCA schedule might buy a fixed amount each week or month regardless of the price on that day. A lower price means the same dollars buy more units; a higher price means they buy fewer. The schedule removes the need to choose a single entry date, but it does not remove market risk.
A neutral three-purchase example
Imagine a fictional asset priced at $50, $25, and $100 on three purchase dates. Investing $100 each time buys 2, 4, and 1 units. The buyer contributed $300 and acquired 7 units. The weighted average purchase cost is $300 ÷ 7, or about $42.86 per unit. Simply averaging the three prices gives $58.33, which is not the price paid per unit across the whole position.
| Purchase | Price | Contribution | Units bought |
|---|---|---|---|
| 1 | $50 | $100 | 2 |
| 2 | $25 | $100 | 4 |
| 3 | $100 | $100 | 1 |
DCA versus a lump sum
To compare fairly, use the same total contribution. In the example, putting all $300 in at the first $50 price would buy 6 units. The DCA schedule bought 7 because a lower price arrived on the second date. If prices had risen steadily instead, the lump sum could have bought more units. A comparison describes one path of prices; it is not a rule that one method always wins.
Fees and weighted average cost
A purchase fee leaves less money to buy crypto. At a 1% fee, each $100 contribution has $99 available for the asset, so the same example would acquire 6.93 units rather than 7. The net weighted average purchase price is total net buying capital divided by units acquired. For an overall profit or loss, compare the ending value with the full gross amount contributed, including fees.
Small, frequent purchases can make fixed per-order charges especially important. HandyCalcHub's DCA calculator models a percentage purchase fee; it does not model every exchange's fee schedule, spread, or execution price.
What a backtest can and cannot tell you
A historical backtest estimates what a selected schedule would have produced at observed past prices. It can help explain how contribution timing, fees, and price changes interact. It cannot tell you future prices or guarantee the same outcome. Real trades may occur at different times and prices, with slippage, taxes, custody costs, and other differences. Crypto markets can be volatile and losses are possible.
This guide is educational information, not financial or investment advice. For a general definition of dollar-cost averaging, see Investor.gov.
Key takeaway
A fixed contribution buys more units at lower prices. Weighted average cost comes from total capital used to buy crypto divided by total units, while past outcomes remain only historical.