What Is a Call Option?
A call option is a contract that gives the buyer the right to purchase 100 shares of a stock at a fixed price (the strike price) before the option expires. The buyer pays a fee called the premium to the seller for this right. If the stock price rises above the strike price plus the premium, the call option becomes profitable. If the stock price stays below the strike price, the option expires worthless and the buyer loses the premium.
Call options are the most commonly traded type of option. They are used by traders who expect a stock to rise (bullish speculation), by investors who sell calls against shares they own to generate income (covered calls), and by portfolio managers who use calls as part of complex hedging strategies. Understanding call options is the foundation of all options trading education.
A call option is like a coupon that lets you buy a product at today's price within a certain time period. If the price goes up, your coupon saves you money. If the price drops, you throw away the coupon and buy at the lower market price. The coupon cost (premium) is all you risk.
Call Option Profit Formula
Call Option Example: From Purchase to Profit
- 1Total cost = $5.00 × 100 = $500
- 2Breakeven = $155 + $5 = $160
- 3Value at expiry = ($175 - $155) × 100 = $2,000
- 4Net profit = $2,000 - $500 = $1,500
- 5ROI = $1,500 / $500 = 300%
- 6Compare: Buying 100 shares at $150 = $15,000 invested, $2,500 profit = 16.7% return
ITM, ATM, and OTM Calls Explained
| Type | Example Strike | Intrinsic Value | Premium | Delta | Probability ITM |
|---|---|---|---|---|---|
| Deep ITM | $130 | $20.00 | $22.50 | 0.90 | ~90% |
| ITM | $145 | $5.00 | $8.00 | 0.65 | ~65% |
| ATM | $150 | $0.00 | $5.50 | 0.50 | ~50% |
| OTM | $155 | $0.00 | $3.50 | 0.35 | ~35% |
| Deep OTM | $170 | $0.00 | $0.80 | 0.12 | ~12% |
Factors That Move Call Option Prices
- Stock price increase: Call value rises (positive delta). A $1 stock rise moves an ATM call approximately $0.50.
- Time passing: Call value decreases (negative theta). Time decay accelerates in the final 30 days before expiration.
- Volatility increase: Call value rises (positive vega). A 1% IV increase might add $0.10-$0.20 to the premium.
- Interest rate increase: Call value rises slightly (positive rho). Minimal impact for short-term options.
- Dividend payment: Call value decreases because the stock price drops by the dividend amount on the ex-date.
Common Call Option Strategies
| Strategy | Setup | Outlook | Risk/Reward |
|---|---|---|---|
| Long Call | Buy 1 call | Bullish | Limited risk, unlimited reward |
| Covered Call | Own stock + sell 1 call | Neutral-Bullish | Stock risk minus premium, capped upside |
| Bull Call Spread | Buy lower call + sell higher call | Moderately Bullish | Net debit risk, capped reward |
| Long Call Butterfly | Buy 1 low, sell 2 mid, buy 1 high | Neutral (pin at middle) | Low risk, moderate reward |
| Call Calendar Spread | Sell short-term call + buy long-term call | Neutral to Bullish | Net debit risk, benefits from time decay |
When Call Options Lose Money
Call options can lose money in three situations: the stock stays flat (time decay erodes the premium), the stock drops (intrinsic value decreases or stays zero), or implied volatility decreases (vega crush reduces the premium). Even if the stock rises, a call can lose money if the rise is not large enough to overcome the premium paid and time decay. This is why calculating breakeven before entering a trade is critical.
Approximately 30% of call options expire worthless. Of those that are closed before expiration, many are closed at a loss. Success with call options requires proper strike selection, timing, and risk management. Never risk more than you can afford to lose.