Calls vs Puts for Beginners

Every options strategy is built from two pieces: calls and puts. Learn what each one does, and what changes when you buy or sell it, and the rest of options gets much easier.

The one-line definitions

A call gives the buyer the right, but not the obligation, to buy 100 shares at a set strike price until expiration. A put gives the buyer the right to sell 100 shares at the strike. The buyer pays a premium for that right. The seller collects the premium and takes on the matching obligation.

A quick memory aid: call up, put down. Call buyers generally benefit when the stock rises, and put buyers when it falls.

Four basic positions

Selling options without the shares or cash to back them carries large risk. Beginners usually start with the secured versions: the covered call and the cash-secured put.

Worked example: buying a call HYPOTHETICAL

Worked example: buying a put HYPOTHETICAL

In the money, at the money, out of the money

A call is in the money when the stock is above the strike. A put is in the money when the stock is below the strike. At the money means the stock is near the strike, and out of the money is the opposite of in the money. In-the-money options have intrinsic value. Every option before expiration also has extrinsic (time) value, which shrinks as expiration approaches.

Why buyers often lose even when they’re "right"

A call buyer needs the stock to rise enough, soon enough. In the call example, a rise from $50 to $53 still loses money at expiration. Time decay (theta) works against buyers every day, and a drop in implied volatility can shrink the premium even when the stock moves your way. See what is implied volatility and how to read the Greeks.

Exercise and assignment

Buyers can exercise. For US equity options, which are usually American-style, that can happen any time before expiration. Sellers may then face assignment. In practice, many traders close positions before expiration instead of exercising, because selling the option captures any remaining time value.

Combining calls and puts

Once calls and puts make sense, strategies are just combinations of them. A bull call spread pairs a long call with a short call. A protective put adds a long put to shares you own. A straddle buys both a call and a put. Browse them all on the strategies page.

Reading an option quote

An option chain lists calls on one side and puts on the other, with strikes down the middle. For each contract you’ll usually see:

• Bid and ask: the highest price buyers are offering and the lowest price sellers will accept. The gap between them is the bid-ask spread, which you pay when trading.
• Last: the last traded price. It may be stale on quiet contracts.
• Volume and open interest: how much traded today, and how many contracts remain open. Both are rough signs of liquidity.
• IV and the Greeks: model-based estimates. See our Greeks guide.

Quotes are per share. Multiply by 100 for the cost of one contract.

Calls and puts at a glance

Buying vs selling: the mindset shift

Buyers pay a small, known amount for a chance at a larger payoff. Many out-of-the-money options bought this way expire worthless, and the occasional large win has to make up for the many small losses. Sellers take the other side. They collect a small, known premium with a fairly high chance of keeping it, but accept a larger loss when the stock moves sharply against them. Neither side has a built-in edge. The premium is the market's attempt to price that trade-off fairly. Knowing which side you're on, and what a bad outcome looks like in dollars, matters more than which side you choose.

Choosing an expiration as a buyer

Shorter expirations cost less, but they give your view less time to play out, and time decay tends to speed up near expiration. Longer expirations cost more upfront but decay more slowly per day. There is no universally right answer. Match the expiration to how long you think your idea needs, and check how much of the premium is time value you could lose.

Common beginner mistakes

• Forgetting the ×100 multiplier when sizing a trade.
• Buying far out-of-the-money options because they’re cheap. Cheap usually means unlikely to pay off.
• Holding through expiration without knowing what will happen to an in-the-money option at your broker.
• Selling uncovered calls without understanding the unlimited risk.

Try it

Enter the hypothetical trades above into the options profit calculator and move the stock price to see how profit changes. Use the risk/reward calculator to compare what you could lose with what you could gain, and keep the glossary open in another tab.

FAQ

Is buying a put the same as shorting a stock?
No. Both benefit when a stock falls, but a long put’s maximum loss is the premium you paid, while a short stock position can in theory lose without limit. A put also expires and loses value over time.

What is the most I can lose buying a call or put?
The premium you paid, times 100 per contract, plus fees.

What is the most I can lose selling an option?
Selling an uncovered call has theoretically unlimited risk. Selling a put risks up to the strike minus the premium, per share. That is why beginners usually learn covered calls and cash-secured puts before any uncovered selling.

Why does one contract cost 100 times the quoted price?
A standard US equity option contract usually covers 100 shares, so a quoted premium of $1.50 costs about $150 per contract.