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Stock Average Cost Calculator

Instantly calculate average cost basis for multiple buy orders

Add your buy orders and click Calculate. Up to 10 rows supported.

Shares Price per Share

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💡 Tips

  • Average cost = Total investment ÷ Total shares. Adding shares at a lower price (DCA) reduces your average cost basis.
  • Enter a current price to instantly see your unrealised profit or loss across the whole position.
  • You can mix buy orders at different prices to simulate adding to a position over time.

Frequently Asked Questions

How is the average cost calculated?

Average cost = Total Investment ÷ Total Shares. Each buy order contributes (shares × price) to the total investment and shares tally.

What is dollar-cost averaging (DCA)?

DCA means buying additional shares at lower prices to reduce your average cost basis. This calculator lets you see exactly how much each new purchase moves your average.

Is my data saved anywhere?

No. All calculations run entirely in your browser. No data is sent to any server.