Stock Average Cost Calculator
Calculate your average cost per share after multiple purchases.
Track your cost basis for stocks and ETFs.
Average Cost Per Share
Average Cost Per Share tells you how much you paid on average across multiple purchases.
Average Cost = Total Amount Invested / Total Shares Owned
Example with 3 purchases:
| Purchase | Shares | Price | Total |
|---|---|---|---|
| 1st | 10 | $50 | $500 |
| 2nd | 20 | $40 | $800 |
| 3rd | 15 | $45 | $675 |
| Total | 45 | — | $1,975 |
Average Cost = $1,975 / 45 = $43.89 per share
This is essential for:
- Calculating capital gains taxes
- Tracking dollar-cost averaging performance
- Knowing your breakeven price