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What is the difference between call and put options?
A call option gives its buyer the right to buy the underlying at a fixed strike price; a put gives the right to sell it. American-style contracts allow exercise before expiration, while European-style contracts allow it only at expiration. Standard, unadjusted equity options generally cover 100 shares; other contracts have different multipliers, deliverables or cash settlement.
The table compares standard equity calls and puts and excludes costs. The purchased option can lose its premium; stock created through exercise has its own risk. The seller receives premium and takes the opposite obligation: a physically settled call seller may have to deliver shares, and a put seller may have to buy them at the strike.
How call and put payoffs mirror each other
A long call gains value as the underlying rises above the strike. Its breakeven at expiration is the strike plus the premium paid, and its upside grows with the stock, so the profit is theoretically uncapped. A long put gains value as the underlying falls below the strike. Its breakeven is the strike minus the premium, and its maximum gain is capped because the underlying can fall no lower than zero.
Moneyness is also reversed. A call is in the money when the underlying trades above the strike, while a put is in the money when it trades below. The Greeks reflect the same symmetry: a call carries positive delta and a put carries negative delta, and under the Black-Scholes model a European call and put at the same strike and expiration share the same gamma and vega, while their theta differs because of interest rates and dividends.
When to use a call vs a put
Direction is the starting point. A trader expecting a rise buys a call; a trader expecting a decline buys a put. But direction alone is not enough, because both contracts also price time and implied volatility. A cheap-looking call can still lose money if the move is too slow or if implied volatility falls after entry, and the same is true of a put.
Sellers use the two contracts for income and share acquisition. Selling a cash-secured put is a way to be paid for agreeing to buy shares at a lower price, and selling a covered call is a way to collect income against stock already owned while capping its upside. In each case the seller accepts the obligation the buyer paid to hold.
Bottom line
A call is the right to buy and a put is the right to sell, which makes them opposite tools for opposite views. The purchased options risk their premiums plus costs, while sellers take the mirror obligation and a different risk profile. Plan any stock position created by exercise separately. Choose between them by fixing your directional thesis first, then testing it against the strike, the time to expiration, and the implied volatility each contract carries.
Common questions
Call Option vs Put Option: FAQ
- Is a call or a put better?
- A call is better for a rise and a put is better for a decline, because they express opposite views. A call has positive delta and a put has negative delta, so pick by the direction, magnitude, and timing you expect, plus the implied volatility priced into each contract.
- Can you lose more than the premium on a call or put?
- The purchased option itself can lose its premium plus costs. Exercising a physically settled option creates or changes a stock position, whose risk is separate. A short put can lose strike minus premium if the stock falls to zero; an uncovered short call has unbounded risk as the stock rises.
- Do calls and puts have the same greeks?
- Not all of them. Under the Black-Scholes model, European calls and puts with matching strikes, expiration, and inputs share gamma and vega. Calls have positive delta and puts have negative delta. Interest rates and dividends create differences in theta.
- What happens to a call or put at expiration?
- An option that is in the money is generally exercised or cash-settled for its intrinsic value, and one that is out of the money expires worthless. A call is in the money when the underlying is above the strike, and a put is in the money when the underlying is below the strike.