Average Cost Basis Calculator
The cost basis used for taxes and profit.
Your trades never leave your browser — all math runs locally.Try: Lots (shares, price, fee)=100,50,0,100,55,0 → 200.0000, $10,500, $0, $53
How to use
Cost basis is total spent (price × shares plus fees) divided by shares. The calculator returns it directly.
FAQ
Which cost method do brokers use?
Many use average cost for mutual funds; specific shares or FIFO for stocks — check your broker.
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