ドルコスト平均法（DCA）計算ツール
一連の価格で同じ金額を投資した場合の取得株数、1株あたり平均取得単価、そして価格の単純平均との比較を確認できます。
- 1株あたり平均取得単価
- $97.94
- 価格の単純平均
- $98.50
- 取得株数
- 30.6323
- 投資総額
- $3,000.00
- 最終価格での評価額
- $3,369.55(+$369.55)
一定額は価格が低いときにより多くの株数を買うため、平均取得単価は価格の単純平均を下回ります。これは算術上の結果であり、優位性ではありません。
計算方法
average cost = total invested / total shares (the harmonic mean of the prices)
- total invested
- the fixed amount multiplied by the number of purchases
- total shares
- sum of (amount / price) at each purchase
計算例
Investing $500 at $100, $92 and $105 buys 15.20 shares for $1,500. That is an average cost of $98.71 — below the $99.00 simple average of the prices, because the fixed amount bought more shares when the price was lower.
よくある質問
- What is dollar-cost averaging?
- Investing a fixed amount at regular intervals regardless of price. Because the fixed amount buys more shares when the price is lower and fewer when it is higher, the average cost per share differs from the average of the prices themselves.
- Why is my average cost lower than the average price?
- A fixed contribution buys more shares at low prices, so those cheaper purchases carry more weight. The result is the harmonic rather than the arithmetic mean, which is always lower when prices vary.
- Does dollar-cost averaging guarantee a better result?
- No. It removes the need to time entries and smooths the cost basis, but in a steadily rising market investing earlier would have produced more. It is a method of contributing, not a way to avoid loss.
その他の無料ツール
このツールは入力された数値を計算するものです。情報提供および教育目的のみであり、投資・税務・財務上の助言ではなく、いかなる証券の売買や保有を推奨するものでもありません。試算は仮定であって予測ではありません。必ずご自身で十分に確認してください。