Average Cost Basis Calculator
Average your purchase price across several buys and see profit or loss.
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How it works
Average cost = total money spent ÷ total shares owned. Enter the same number of prices and share counts, in matching order. Buying more when the price is low pulls the average down. Fees are not included. Example: with the default values, average cost per share comes to $9.71.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.