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Options trading basics: calls, puts and premium
Options sound like a secret club with its own language. They're really just contracts with a price, a deadline and a choice. Here are the basics to understand before you ever trade one.
Scope first: what this page is and isn't
This page explains how options work. It doesn't teach an options strategy, and it doesn't suggest any trade.
Options are popular, especially with younger investors. They're also easy to misunderstand. Knowing the 5 words below, and how a buyer can lose the full amount paid, is the base everything else sits on.
An option is a contract with a choice
An option gives the buyer the right, but not the duty, to buy or sell something at a set price, before a set date.
A plain-life example: you pay a small deposit to hold a house at $300,000 for 3 months. If house prices jump, your deal looks great. If they fall, you walk away, and you lose only the deposit.
Options work a lot like that deposit.
The 5 words that unlock options
| Word | What it means |
|---|---|
| Call | The right to buy at a set price |
| Put | The right to sell at a set price |
| Strike | That set price |
| Expiry | The last day the option exists |
| Premium | What the buyer pays for the option |
Calls
A Call option gives the right to buy shares at the strike price. Buyers of calls usually expect the stock to rise above the strike.
Puts
A Put option gives the right to sell shares at the strike price. Buyers of puts usually expect the stock to fall below the strike, or want protection if it does.
Strike
The Strike price is the price written into the contract. A $50 call is the right to buy at $50, no matter where the stock trades.
Expiry
Every option has an end date. Some expire within days, others in months or more. After expiry, the option is gone.
Premium
The premium is the price of the option. In the US, one standard stock option contract usually covers 100 shares, so the quoted price is multiplied by 100. A premium quoted at $2.00 costs $200 for one contract.
A worked example (an illustration, not a trade idea)
Say a stock trades at $48. You look at a call with a $50 strike, expiring in one month, priced at $1.00. One contract costs $1.00 × 100 = $100.
What could happen by expiry:
- The stock ends at $47. It's below the strike. Nobody wants to buy at $50 when it's $47 in the market. The option expires worthless. You lose the full $100.
- The stock ends at $50.50. The option is worth about $0.50, or $50 per contract. You still lose about $50, even though the stock went up.
- The stock ends at $53. The option is worth about $3.00, or $300 per contract. That's $200 more than you paid.
Notice the middle case. The stock rose, and the buyer still lost money. The stock has to move far enough, fast enough. That's the part beginners most often miss.
The key risk for buyers: if the option expires worthless, you lose 100% of the premium you paid. That's the most a buyer can lose, but it happens often, because the stock has to move past the strike, plus the premium, before expiry.
Time decay: the clock is always running
An option's price is made of two parts:
- Real value now: how far past the strike the stock already is.
- Time value: what people will pay for the chance that it moves further before expiry.
As expiry gets closer, there's less time for a move, so time value shrinks. This shrinking is called time decay (traders call it "theta").
It doesn't shrink evenly. Decay tends to speed up in the last few weeks before expiry. So if the stock sits still, a bought option usually loses value day by day.
In plain words: when you buy an option, you need to be right about the direction, the size of the move and the timing. All 3, not just 1.
Why options feel like leverage
$100 controls the price move of 100 shares. That's why options can swing much more, in percent, than the stock itself. A small stock move can double an option's price, or cut it in half.
That's the same idea as Leverage: small money, big exposure. It works in both directions. Our guide to leverage and margin explains why that cuts both ways.
Buyers and sellers have very different risk
Every option has a buyer and a seller (also called the writer).
- The buyer pays the premium. The most they can lose is that premium.
- The seller collects the premium. In return, they take on the duty to buy or sell if the buyer chooses. Some selling positions carry losses far larger than the premium collected.
That's why US brokers ask questions about your experience and approve accounts for different options "levels." Many beginners start at the most basic level, or with none at all.
What US brokers give you first
Before you can trade options in the US, your broker must give you a booklet called Characteristics and Risks of Standardized Options. It's long, but it's the official plain description of how listed options work and what can go wrong. The SEC's investor.gov site has beginner material on options too.
How this fits with a beginner path
You don't need options to learn to read a chart. In fact, it helps to learn the chart first: trends, levels, and how to size a trade at about 1% risk. Options add three more things to be right about: size of move, timing and price paid.
If you do explore them later, the same rules apply. Decide your maximum loss before you enter. Keep it small. Practice first, using a paper account. See practice trading without money.
Try it today (no money needed)
- Open the options list for one large stock in a broker's demo or a free site.
- Find one call and one put for next month.
- Write down each one's strike, expiry and premium.
- Multiply each premium by 100 to see the real cost of one contract.
- Check them again in a week. Notice how the prices changed, even if the stock barely moved.
Questions
What is options trading in simple terms?
Buying or selling contracts that give the right to buy (a call) or sell (a put) a stock at a set price, before a set date. The buyer pays a price called the premium for that right.
Can you lose more than you invest in options?
When you buy a call or a put, the most you can lose is the premium you paid, and losing all of it is common. Some option-selling positions can lose much more than the premium collected.
Why do options lose value over time?
Part of an option's price is time value, the chance of a bigger move before expiry. As expiry approaches, there's less time left, so that part shrinks. This is called time decay, and it tends to speed up near the end.
Are options good for beginners?
They add more ways to be wrong: you need the right direction, size of move and timing. Many beginners learn to read charts and manage risk on stocks first, then study options once those basics are solid.
How much does one option contract cost?
A standard US stock option usually covers 100 shares, so you multiply the quoted premium by 100. A premium of $1.50 costs about $150 per contract, plus any fees.
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