Cost Per Share Calculator

Use our Cost Per Share Calculator to work out what you paid for each share, fees included — for a single purchase, or as the average cost across several purchases of the same stock.

For one purchase, enter the amount you paid, any fees and the number of shares. For several, enter each purchase’s shares, price per share and fee: the calculator adds up what each purchase cost and divides the total by all your shares, so bigger purchases count for more. Fractional shares are allowed.

Add today’s share price to see what your shares are worth now and your gain or loss. The cost per share is shown to 4 decimal places, as many brokerages show it.

This is an average purchase cost, not a tax basis — sales, stock splits and tax-lot rules can change that, so treat the results as an estimate. To work out the profit when you sell, use our Stock Profit Calculator.