The Dollar-Cost Averaging Calculator shows what happens when you invest a fixed amount at a series of prices: how many units you accumulate, your average cost, and how that compares with putting all the money in at once.
How averaging works
For each purchase:
units bought = amount invested ÷ price
Your blended cost is then:
average cost per unit = total invested ÷ total units
Because a fixed amount buys more units when the price is low and fewer when it is high, the average cost is pulled toward the cheaper prices — which is the core benefit of dollar-cost averaging.
Worked example
Investing 300 at prices of 10, 12, 8 and 15:
| Price | Amount | Units bought |
|---|---|---|
| 10 | 300 | 30.00 |
| 12 | 300 | 25.00 |
| 8 | 300 | 37.50 |
| 15 | 300 | 20.00 |
Total invested is 1,200 for 112.5 units, an average cost of 1,200 ÷ 112.5 ≈ 10.67 — below the simple average price of 11.25, because more units were bought
when the price was low. The tool also shows your current value and profit at the
latest price you enter, and a lump-sum comparison.