株式平均取得単価計算ツール
同じ銘柄の各購入を1つの平均取得単価にまとめ、任意の現在価格での含み損益を確認できます。
株式数1株あたり価格
$
$
- 1株あたり平均取得単価
- $132.00
- 総株数
- 25
- 取得総額
- $3,300.00
計算方法
average cost = sum(shares x price) / sum(shares)
- shares x price
- the amount spent on one purchase
- sum(shares)
- every share held, not the number of purchases
計算例
Buying 10 shares at $150 ($1,500) and 15 at $120 ($1,800) is $3,300 across 25 shares, so the average cost is $132.00 — not $135.00, which is what averaging the two prices would wrongly give.
よくある質問
- How do I calculate my average cost per share?
- Divide the total amount spent by the total number of shares. Add up (shares x price) for every purchase, then divide by the sum of the shares — not by the number of purchases.
- What is averaging down?
- Buying more of a holding at a lower price than you paid, which reduces your blended cost per share. It lowers your break-even price but also increases the amount committed to a position that has fallen.
- Does my broker calculate this the same way?
- Brokers generally report an average cost, but tax reporting may use specific-lot identification instead, which can produce a different gain or loss. Your broker’s records are the ones that count at tax time.
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