定投成本平均（DCA）计算器
在一系列价格上投入相同金额，查看累计股数、每股平均成本，以及它与这些价格简单平均值的差异。
- 每股平均成本
- $97.94
- 价格的简单平均
- $98.50
- 获得股数
- 30.6323
- 累计投入
- $3,000.00
- 按最后价格计的价值
- $3,369.55(+$369.55)
由于固定金额在价格较低时能买到更多股份，您的平均成本会低于价格的简单平均值。这是算术结果，并非某种优势。
计算方式
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
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.
常见问题
- 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.
其他免费工具
本工具仅对您输入的数字进行计算。它仅供信息和教育用途，不构成投资、税务或财务建议，也不是买入、卖出或持有任何证券的推荐。测算是假设，而非预测。请务必自行尽职调查。