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What Is a Call Option?
A call option gives you the right, but not the obligation, to buy 100 shares of a stock at a
specific price (the strike price) on or before the expiration date. You pay a premium upfront for this right.
The Core Idea
Buying a call is a bet that the stock will go up. If it does, your call increases in value.
If it doesn't, the most you can lose is the premium you paid.
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Buying a Call (Long Call)
When you buy a call, you're paying a premium for the right to buy 100 shares at the strike price. This is the
most basic bullish options trade.
Example: AAPL $180 Call @ $5.00
- Cost: $5.00 x 100 shares = $500 total premium
- Breakeven: $180 + $5 = $185 (stock must be above this at expiration to profit)
- Max loss: $500 (the premium you paid) — this happens if AAPL stays below $180
- Max profit: Unlimited — the higher AAPL goes above $185, the more you make
When to Buy a Call
- You're bullish on the stock and expect it to rise before expiration
- You want leveraged exposure with a defined max loss
- Implied volatility is relatively low (premiums are cheap)
The Catch
Most long calls expire worthless. You need to be right about direction, timing, and magnitude.
The stock has to move enough to overcome the premium you paid (the breakeven), and it has to do it before
expiration. Time decay (theta) works against you every day.
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Selling a Call (Short Call)
Selling a call means you collect premium upfront, but you're obligated to sell 100 shares at the strike price if
the buyer exercises. This is a bearish or neutral bet — you profit if the stock stays below the strike.
Example: Sell AAPL $190 Call @ $3.00
- Credit received: $3.00 x 100 = $300
- Max profit: $300 (if AAPL stays below $190)
- Max loss: Unlimited (if AAPL surges above $190)
- Breakeven: $190 + $3 = $193
Naked vs Covered Calls
Selling a call without owning the stock is a naked call — this has unlimited risk and most
brokers won't let beginners do it. A covered call means you already own 100 shares, so if
assigned you just sell your shares. Covered calls are one of the most popular income strategies.
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How Call Prices Move
A call option's price is driven by several factors. Understanding these helps you predict how your position will
behave.
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Stock price goes up: Call value increases (delta is positive)
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Time passes: Call value decreases (theta decay erodes premium)
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Implied volatility rises: Call value increases (higher IV = higher premiums)
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Closer to expiration: Time decay accelerates, especially for at-the-money options
In-the-Money vs Out-of-the-Money Calls
- ITM call (stock > strike): Has intrinsic value. More expensive but higher probability of profit. Moves almost 1:1 with the stock when deep ITM.
- ATM call (stock ≈ strike): Most sensitive to all Greeks. Highest time value. Most popular for directional bets.
- OTM call (stock < strike): Cheapest but lowest probability. All extrinsic value — decays to zero if stock doesn't move enough.
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See It In Action
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Key Takeaways
Key Takeaways
- A call gives you the right to buy 100 shares at the strike price.
- Buying calls = bullish bet with limited risk (premium paid) and unlimited upside.
- Selling calls = collecting premium but taking on obligation to sell shares.
- Covered calls (selling calls while owning shares) are one of the safest income strategies.
- You need to be right about direction, magnitude, AND timing — being right on direction alone isn't enough.
- Time decay works against call buyers and in favor of call sellers.
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