Finance
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Stock Average Price.
Calculate average stock purchase price over multiple buys
Set your values
Results update as you type.
How to Use the Stock Average Calculator
Find your average cost per share after buying at multiple prices.
- Enter each purchase: number of shares and price.
- Add as many buys as you need.
- See your average cost and total invested.
Average Cost Formula
Average Price
Sum the money spent and divide by total shares owned.
Example:
Input: 10 @ $100 + 10 @ $80
Calculation: 1,800 / 20
Result: $90 per share
Real-World Use Cases
Dollar-Cost Averaging
Track your blended cost across recurring buys.
Averaging Down
See how adding shares at a lower price changes your break-even.
Tips
Tips
- A lower average cost lowers your break-even price.
- Averaging down a falling stock can increase risk — know the company.
Related Calculators
Cite this calculator
Canonical URL: https://mathify.one/en/finance/stock-average
Cite as: Mathify. (2026). Stock Average Price. https://mathify.one/en/finance/stock-average
Use Cases
Plan your next purchase
Use the calculator to see how a new buy at a certain price would affect your average cost. This can help you decide whether to add to your position and at what price.
Example: If your current average is $55 and you buy more at $45, your new average will be lower.
Frequently Asked Questions
- How do I calculate the average price of my stock purchases?
- To calculate the average price, sum the total cost of all your purchases (price per share multiplied by number of shares for each buy) and divide by the total number of shares you own. This gives you the blended average cost per share.
- Why is the average price important for my stock investments?
- The average price helps you understand your true cost basis per share. It's useful for tracking performance, setting sell targets, and calculating potential gains or losses when you decide to sell some or all of your shares.
- Does the average price include fees or commissions?
- No, the calculator only uses the price per share and quantity you enter. It does not account for brokerage fees, commissions, or other transaction costs. To get a more accurate cost basis, you may need to add those separately.
Tips & Common Mistakes
Tips
- Enter each purchase as a separate line with the price per share and the number of shares bought.
- Double-check your entries for accuracy – a small mistake in quantity or price can skew your average.
- Use the average price to set realistic sell targets that cover your total investment cost.
- Remember that the average price is a simple arithmetic mean, not weighted by time – it treats each share equally.
Common Mistakes to Avoid
- Forgetting to include all purchases – missing a buy will give an incorrect average.
- Entering the total cost instead of the price per share – the calculator expects price per share and quantity.
- Ignoring that the average price is not the same as the median or the most recent price – it's the blended cost.
Last updated: August 13, 2026