Stock Average Cost Calculator

Determine your weighted average purchase price and total investment across multiple purchase lots of a stock. Calculate it clearly with Figur.

How the stock average cost calculator works

Determine your weighted average purchase price and total investment across multiple purchase lots of a stock.

Method and assumptions

Figur applies standard payment, interest, or projection formulas to the values you enter. The calculation runs entirely in your browser.

  • Rates and contributions stay constant for the period unless the calculator says otherwise.
  • Taxes, insurance, fees, penalties, and lender-specific terms are excluded unless a field explicitly includes them.
  • Results are rounded estimates; a financial institution may use different rounding rules or payment dates.

This tool is for general information, not financial, tax, legal, or investment advice. Confirm important figures with the relevant institution or a qualified professional.

Sources and references

No external rates or products are consulted: the calculator applies standard financial formulas only to the values you enter.

Worked example

You buy 10.5 shares at $150 and later 20 shares at $140, both with a $1 fee.

Your average cost is $143.87 per share on a $4,377 total investment.

Frequently asked questions

Does this account have fees?

Yes, you can optionally include fees or commissions in each purchase lot.

Does it support fractional shares?

Yes, fractional shares are fully supported.

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