Stock Average Calculator
Estimate your weighted average stock cost basis after up to four purchases. Optionally compare it with a current market price.
Stock Average Calculator tool
| Metric | Value |
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Weighted average cost = total amount invested ÷ total shares purchased.
Informational only. Does not include commissions, taxes, spreads, or partial lot accounting rules.
The calculator multiplies each purchase quantity by its price, adds the totals together, and divides by total shares. That gives the weighted average cost per share.
If you enter a current market price, the tool also estimates unrealized gain or loss compared with your average cost basis.
Examples
- 10 shares at $50 and 15 shares at $45 → weighted average below $50
- Buying more at lower prices can reduce average cost
- Enter current price to estimate unrealized position value
FAQ
- What does this stock average calculator do?
It calculates your weighted average cost per share after multiple stock purchases at different prices.
- Why is weighted average cost useful?
It helps you understand your true average purchase price across multiple buy orders.
- Can I estimate unrealized gain or loss?
Yes. Enter the current price to estimate unrealized profit or loss.
- Does this include fees or taxes?
No. This version does not include commissions, taxes, or other trading costs.
- Are my trade inputs stored?
No. All calculations run locally in your browser and are not stored or transmitted.