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Calls vs puts: the right to buy vs the right to sell

A call option gives you the right to buy a stock at a set price. A put gives you the right to sell it at a set price. That's the whole idea. The details, like time and cost, are where most beginners get caught.

Comparison · 7-minute read · Updated 2026-10-21

The short answer

A Call option gives the buyer the right, but not the duty, to buy 100 shares at a set price (the Strike price) before or on a set date (the Expiration date). Call buyers usually expect the price to rise.

A Put option gives the buyer the right to sell 100 shares at the strike price by the expiration date. Put buyers usually expect the price to fall, or want protection against a fall.

The buyer pays a price for that right, called the premium. If you buy either one, the most you can lose is the premium you paid. All of it can be lost.

Side by side

How a call works, with numbers

A stock trades at $100. You buy one call with a $105 strike, expiring in one month. The premium is $2 per share. One contract covers 100 shares, so you pay $200.

At expiration:

• Stock at $100: the call is worth nothing. You lose $200.
• Stock at $107: the call is worth $2 ($107 − $105). You get back $200. You break even.
• Stock at $112: the call is worth $7, or $700. After the $200 you paid, you're up $500.

Break-even = strike + premium = $105 + $2 = $107. The stock has to rise more than 7% just for you to get your money back. An illustration, not a forecast.

How a put works, with numbers

Same stock at $100. You buy one put with a $95 strike for $2, so $200 total.

At expiration:

• Stock at $100: the put is worth nothing. You lose $200.
• Stock at $93: the put is worth $2. You break even.
• Stock at $88: the put is worth $7, or $700. You're up $500 after cost.

Break-even = strike − premium = $95 − $2 = $93. A math example, not a promise. The options profit calculator runs these numbers for any strike.

Why time matters so much

An option is a right with a deadline. Every day it loses a bit of value, even if the stock doesn't move. That's called time decay, or Theta.

• The stock can move the way you guessed, but too slowly, and you still lose.
• The decay usually speeds up as expiration gets close.
• Options also get pricier when traders expect big moves. See Implied volatility. After big news, that can drop fast and pull the option's price down with it.

Calls: strengths and limits

The good parts:

• Less money up front than buying 100 shares.
• Known worst case for the buyer: the premium.

The limits:

• Time works against you.
• The stock must clear the break-even, not just rise a little.

Puts: strengths and limits

The good parts:

• A way to bet on a fall without short selling shares.
• Protection. A put on shares you own can limit how much a drop hurts. That's often called a protective put.

The limits:

• Same time decay.
• Protection costs money every time you buy it.

Which fits you?

1. New to markets? Learn to read charts and manage risk on shares or paper trades first. See options vs stocks.
2. Want to understand options? Paper trade a few calls and puts. Watch how time and news change their price.
3. Thinking of selling options instead? That's a different risk profile, and it can be much larger. Read buying vs selling options first.

Your size rule still applies: decide the most you'll lose on the trade before you buy, and treat the whole premium as at risk. The position size calculator helps for stock trades.

Common mistakes

• Buying cheap, far-away options. They're cheap because they rarely pay off.
• Ignoring the break-even. The stock must move past strike plus (or minus) the premium.
• Holding into earnings for the "big move". Implied volatility often drops after the report.
• Forgetting the 100× multiplier. A $2 option costs $200.
• Buying more after a loss to "make it back". See revenge trading.

Questions