How to Buy a Call Option Step by Step

Buying a call option is straightforward once you understand the process. Here's exactly how to do it, from forming your trade idea to managing the position after you've entered it.

Step 1: Choose the Underlying Stock

Start with a stock you have a bullish thesis on. Ask yourself:

  • Why do I think this stock will go up?
  • What's the catalyst? (earnings, product launch, sector rotation)
  • Over what timeframe do I expect the move?

    • Stick to liquid stocks with active options markets. Names like AAPL, MSFT, AMZN, SPY, and QQQ have tight bid-ask spreads and plenty of strike prices to choose from. Illiquid options on small-cap stocks will cost you on the spread.

    Step 2: Open Your Options Chain

    In your brokerage platform, navigate to the stock's options chain. This shows all available contracts organized by:

  • Expiration date (across the top or in tabs)
  • Strike prices (listed vertically)
  • Calls on the left, puts on the right (standard layout)

    • You'll see the bid price, ask price, volume, open interest, and Greeks for each contract.

    Step 3: Select Your Expiration Date

    This is one of the most important decisions. Your expiration should give the stock enough time to make the move you're anticipating, plus a buffer.

    Rules of thumb:

  • If you expect a move in 2 weeks, buy at least 30-45 DTE (days to expiration)
  • If you expect a move in 1-2 months, buy 60-90 DTE
  • Never buy an expiration that matches your timeline exactly—time decay accelerates near expiration and will work against you

    • Longer expirations cost more but give you more time. Shorter expirations are cheaper but decay faster.

    Step 4: Pick Your Strike Price

    The strike price determines your cost and probability of profit:

    | Strike Type | Delta Range | Cost | Probability of Profit | In-the-money (ITM)0.60-0.80HigherHigher At-the-money (ATM)0.45-0.55ModerateModerate | Out-of-the-money (OTM) | 0.15-0.35 | Lower | Lower |

    For beginners: Start with ATM or slightly ITM strikes. They cost more per contract but have a much higher probability of being profitable. Cheap OTM options look appealing but most expire worthless.

    A practical approach: choose a strike with a delta between 0.40 and 0.60. This balances cost with a reasonable probability of profit.

    Step 5: Check Implied Volatility

    Before buying, check whether implied volatility (IV) is elevated. High IV means expensive options. You can compare the current IV to its historical range (IV rank or IV percentile).

  • IV Rank above 50%: Options are relatively expensive. Consider whether the premium is justified.
  • IV Rank below 30%: Options are relatively cheap. Good time to be a buyer.

    • Buying calls right before earnings when IV is at its peak often leads to losses even if you get the direction right, because IV crushes after the announcement.

    Step 6: Place Your Order

    Select the call option and choose your order type:

  • Limit order (recommended): Set the maximum price you're willing to pay. Use the mid-price (halfway between bid and ask) as your starting point. If it doesn't fill, adjust slightly toward the ask.
  • Market order (avoid): You'll likely pay the ask price, which can be significantly above fair value on illiquid options.

    • Enter the number of contracts. Remember, each contract controls 100 shares, so the total cost is premium × 100 × number of contracts.

    Step 7: Review and Confirm

    Before submitting, verify:

  • Correct ticker symbol
  • Correct expiration date
  • Correct strike price
  • Order type is "Buy to Open"
  • Total cost fits your position sizing rules

    • A common mistake is accidentally selling to open instead of buying to open, which creates a short call position—very different risk profile.

    Step 8: Manage the Position

    Once filled, set your game plan:

  • Profit target: Many traders take profits at 50-100% gain on the option
  • Stop loss: Consider exiting if the option loses 50% of its value
  • Time stop: Close the position if your thesis hasn't played out with 2-3 weeks remaining to expiration

    • Tools like OptionsPilot can help you track your call positions and alert you when they hit your profit targets or when time decay starts accelerating.

    Position Sizing

    Never risk more than 2-5% of your trading account on a single call option. Options can and do go to zero. If you have a $25,000 account, a single call position should cost no more than $500-$1,250.

    This discipline is what keeps you in the game long enough to develop skill.