Stock Average Cost Calculator
Weighted average cost across multiple stock buys.
Your trades never leave your browser — all math runs locally.Try: Lots (shares, price, fee)=100,50,0,200,55,0 → 300.0000, $16,000, $0, $53
How to use
Enter each lot as shares, price and fee. The calculator weights every purchase by its size to give one true average cost per share.
FAQ
Why weight by shares?
A 1,000-share buy moves your average far more than a 10-share buy — weighting reflects reality.
Do fees matter?
Yes — they are part of your cost, so including them gives the real break-even.
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