Definition
A call buyer pays a premium for that right and profits if the stock rises enough to more than cover the premium. The most a buyer can lose is the premium paid. The seller collects the premium and takes on the obligation to sell if assigned.
Formula
Long call breakeven at expiry = strike + premium paid
Example
Hypothetical exampleA call with a $100 strike bought for $3 breaks even at $103 at expiration. Below $100 it expires worthless and the loss is the $300 paid per contract.