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Average Cost and Assignment Calculator

Calculate your updated average share cost after additional purchases, then model covered call assignment and potential profit or loss.

Existing shares

Existing average cost ($)

Additional shares purchased

New purchase price ($)

Shares assigned

Call strike price ($)

Call premium per share ($)

Total shares before assignment

New weighted average cost

Premium on modeled assigned shares

Assignment proceeds

Modeled realized profit or loss

Remaining shares

Remaining share cost basis

Calculations use weighted average share cost for illustration. Actual taxable gain or loss may depend on individual tax lots and adjustments. Standard equity options generally represent 100 shares per contract. This models completed assignment, not the probability of assignment. Early assignment is possible. Excludes fees, taxes and slippage. Educational purposes only.