使用方法
- Enter the number of shares you currently hold and your existing average cost。
- Enter the number of shares you plan to buy and the new buy price。
- Read the updated average cost, total shares, and total invested amount instantly。
範例
- Holding 10 shares at $100 and buying 10 more at $80 gives a new average cost of $90 across 20 total shares ($1,800 invested)。
- Holding 50 shares at $200 and adding 25 at $150 recalculates to $183.33 average — all in your browser, nothing is stored or sent anywhere。