Stock Average Price Calculator — Cost Basis

Add purchase lots with shares and price per share to see weighted average cost, total shares, and total cost.

—Average price
—Total shares
—Total cost

How to use

  1. Add each purchase lot with number of shares and price per share.
  2. Click Add lot for additional purchases.
  3. See weighted average price, total shares, and total cost.

Frequently asked questions

How is average share price calculated?

Weighted average: total cost divided by total shares across all lots.

Can I add unlimited lots?

Yes. Add as many purchase lots as needed for your cost basis calculation.

Does this account for fees?

Include commissions in the price per share if you want them reflected in your average cost.

Is my data sent to a server?

No. All calculations happen in your browser.

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