Choosing the strike price is half the trade. Pick well and the probabilities work for you; pick badly and even a correct market opinion can lose money.
I'm David Jaffee, a former Wall Street investment banker and full-time options trader. I've taught more than 3,500 students how to trade options, and strike selection is one of the first skills I teach.
This guide explains what a strike price is, how to find it on an option chain, and — most importantly — how to actually choose one, whether you're buying calls or selling puts.
Quick Verdict
- The strike price is the price at which an option can be exercised — the price you agree to buy (call) or sell (put) the stock. You don't calculate it; you select it from the option chain.
- There is no single "best" strike. Every strike is a trade-off between premium, probability, and upside. The right strike depends on whether you're buying or selling, and on your goal.
- When I sell puts, I choose out-of-the-money strikes on high-quality companies — at a price where I'd genuinely be happy to own the stock.
- When buying calls, most traders should avoid far out-of-the-money "lottery tickets" — they expire worthless far more often than beginners expect.
What Is an Options Strike Price?
The strike price of an option is the price at which the contract can be exercised. For a call option, it's the price at which you can buy the stock; for a put, the price at which you can sell it.
The strike is fixed when the contract is created, and it's one of the two decisions every options trader makes on every trade (the other is the expiration date).
How to Find the Strike Price of an Option
You'll find strike prices listed in the option chain on any broker platform. Each row of the chain is a different strike, with calls typically shown on the left and puts on the right.
Strikes are also embedded in the option's name itself. "AAPL Jan 16 2026 $210 Call" means the strike price is $210. If you already own an option, your broker's position screen shows its strike the same way.
Exchanges set strikes at fixed intervals — typically $0.50 or $1 apart on lower-priced stocks, and $2.50, $5, or $10 apart on higher-priced ones. That's why you can't "calculate" a strike price: the exchange lists them, and your job is to select the right one.
Strike Price vs. Exercise Price vs. Spot Price
Strike price and exercise price are the same thing — the terms are used interchangeably.
Spot price is different: it's the current market price of the underlying stock, not the option. The relationship between the spot price and the strike price determines whether an option is in-the-money or out-of-the-money — and that relationship is the heart of strike selection.
The Three Zones: ITM, ATM, and OTM
Every strike falls into one of three zones relative to the current stock price:
| Zone | Premium & probability profile | Best suited for |
|---|---|---|
| In-the-money (ITM) | Expensive premium, high probability of retaining value; moves nearly dollar-for-dollar with the stock | Buyers who want stock-like exposure with defined risk |
| At-the-money (ATM) | Moderate premium, roughly 50/50 odds; the most time value of any strike | Traders expecting a meaningful move but unsure of size |
| Out-of-the-money (OTM) | Cheap premium (for buyers) / lower income but higher win rate (for sellers) | Premium sellers — and only cautiously for buyers |
For a call, ITM means the strike is below the stock price. For a put, ITM means the strike is above it. A quick example: with a stock at $55, a $50 put has no intrinsic value (OTM); if the stock falls to $45, that same $50 put is $5 in-the-money.
The Premium–Probability Trade-Off
Here's the single most important idea in strike selection: premium is payment for probability.
A strike that pays more does so because it's more likely to be breached. A strike that's "safer" pays less. There is no strike that offers high income and high safety at the same time — anyone telling you otherwise is selling something.
Your job isn't to find a magic strike. It's to consciously choose where you want to sit on that trade-off, given your goal, your account size, and your willingness to own the stock. Try it yourself with the checker below.
Strike Price Checker
Enter a stock price and a strike — see the zone and the trade-off.
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Educational tool: classifies moneyness and explains the general trade-off. It does not account for time to expiration, volatility, or liquidity — and it is not financial advice.
Once you've picked a strike, run the full trade through my options profit calculator to see your breakeven and profit potential.
How to Choose a Strike Price When Buying Calls
Most beginners buy far out-of-the-money calls because they're cheap. That's usually a mistake.
A far-OTM call needs the stock to make a large move, quickly, just to break even — and most expire worthless. It's a lottery ticket, and the person selling it to you is the house.
If you have genuine directional conviction, a slightly in-the-money or at-the-money strike is usually the better choice: you pay more premium, but the option tracks the stock closely and doesn't need a miracle to profit. You can see the math play out in my options trading example, which includes an interactive profit-and-loss calculator.
Personally, I mostly sell options — but I do buy calls and call spreads during periods of market extremes, when fear has made quality stocks temporarily cheap.
How to Choose a Strike Price When Selling Puts
This is my core strategy, and strike selection is where most of the edge lives. My rules are simple:
1. Only sell puts on companies you'd happily own. The strike price is the price you're agreeing to buy the stock at. If you wouldn't want the shares at that price, don't sell the put.
2. Sell out-of-the-money. An OTM strike gives you a cushion: the stock can stay flat, rise, or even fall modestly, and you still keep the entire premium. You're trading a little less income for a much higher probability of profit.
3. Prioritize probability over premium. The most common blow-up pattern is selling strikes too close to the stock price to squeeze out extra income. That extra premium is not free — it's payment for risk you'll eventually collect on.
4. Leave yourself room to manage. A further-OTM strike gives you time and space to roll or adjust a challenged position instead of being forced into a loss.
Traders who want the quantitative deep-dive on this can read my data-driven guide to the best delta to sell puts, and the complete playbook in my guide to selling put options.
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Common Strike-Price Mistakes
Buying far-OTM options because they're cheap. Cheap and likely-to-expire-worthless are the same thing.
Selling strikes too close to the stock price. Chasing an extra 30% of premium for double the assignment risk is how put-sellers blow up.
Ignoring liquidity. Stick to strikes with tight bid-ask spreads on liquid underlyings; a wide spread is a hidden fee you pay twice.
Selling a put with no plan for assignment. If the stock drops through your strike, you own it. That should be an acceptable outcome you planned for — not a surprise. (And if you don't want assignment risk at all, use a defined-risk spread instead — here's what a naked option is and how the risk differs.)
Is There a Strike Price Formula?
No. There's no formula that outputs the perfect strike, and the online "strike price calculators" mostly just restate the option chain's probabilities.
The Greeks — especially delta — are useful tools: delta approximates the probability an option expires in-the-money. But tools inform judgment; they don't replace it. Strike selection is a skill, and it compounds: my verified returns of approximately +78% and +67% over the past year, documented with real E*TRADE statements on my results page, are built on the same strike-selection principles described above, applied with discipline to a small watch list of quality names. The full approach is in my guide to making a living selling options.
Frequently Asked Questions (FAQs)
What is an options strike price?
The strike price is the price at which an option can be exercised — the price you agree to buy the stock (call) or sell it (put). It's set by the exchange when the contract is listed, and choosing it is one of the two key decisions in every options trade, along with the expiration date.
How do I find the strike price of an option?
Look at the option chain on your broker's platform: each row is a strike price. The strike is also part of the option's name — "AAPL $210 Call" has a $210 strike. For options you already own, your positions screen displays it.
What's the difference between strike price and exercise price?
Nothing — they're synonyms. "Exercise price" and "strike price" both refer to the price at which the option can be exercised.
What's the difference between strike price and spot price?
The strike price is the fixed exercise price of the option. The spot price is the current market price of the underlying stock. Comparing the two tells you whether an option is in-the-money or out-of-the-money.
How do I choose a strike price for call options?
If you're buying a call with real conviction, choose an at-the-money or slightly in-the-money strike — it tracks the stock closely and doesn't require a huge move to profit. Avoid far out-of-the-money strikes; they're cheap because they usually expire worthless.
What's the best strike price for selling puts?
An out-of-the-money strike on a high-quality company, at a price where you'd genuinely be happy to own the shares. That combination gives you a high probability of keeping the premium, a cushion against normal pullbacks, and an acceptable worst case (owning a good stock at a discount).
How are strike prices determined?
Exchanges list strikes at fixed intervals — commonly $0.50 or $1 on lower-priced stocks and $2.50 to $10 on higher-priced ones, with more strikes added as the stock moves. You don't calculate a strike price; you select one from the listed chain.
When is a strike price in the money?
A call is in-the-money when the stock price is above the strike. A put is in-the-money when the stock price is below the strike. Everything else is out-of-the-money (or at-the-money when the two are roughly equal).
Do the Greeks help with strike selection?
Yes — delta is the most useful, since it approximates the probability of expiring in-the-money. But Greeks are inputs to judgment, not a formula. Quality of the underlying, your willingness to own it, and position sizing matter more than any single number.
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