How to Buy Call Options: 3 Winning Rules for 2026 Strategy
Buying a Call option is a powerful way to leverage stock movements, but many traders treat it like a gamble. At Share Navigator, we treat it like a business. To stay on the right side of the math, we follow three non-negotiable rules for every trade.
Rule 1: Focus on a 0.70 Delta (Probability of Profit)
Delta measures how much your option price moves relative to the underlying stock. It is also a rough estimate of the probability that the option will expire “In-the-Money.”
By choosing a Delta of 0.70, you are buying an option that has a high intrinsic value. For every $1 the stock moves up, your option gains roughly $0.70. This reduces the “lottery ticket” risk and ensures your option behaves more like the actual stock, but with less capital required.
Rule 2: Buy Time (Minimum 90 Days to Expiration)
“Time Decay” (Theta) is the silent killer of option buyers. As an option nears its expiration date, its value evaporates at an accelerating rate—especially in the final 30 days.
To give your trade the best chance to succeed, always buy at least 90 days of time. This provides “breathing room” for the stock to make its move without the pressure of the clock working against you every single hour.
Rule 3: Use EquityScan to Determine Your Target Price
Before you enter an option trade, you must know where you are exiting. Guessing is not a strategy. We use EquityScan to bridge the gap between technical momentum and fundamental value.
EquityScan aggregates analyst data and technical indicators to provide a Target Price. By comparing the current stock price to the EquityScan Target Price, you can calculate the “Expected Move.” If the target price doesn’t offer enough upside to justify the option premium, we skip the trade. Always trade where the math is in your favor.
Pro Tip: The “Roll Out” Strategy
If your 90 days are winding down to 30-45 days and the stock hasn’t hit your EquityScan Target Price yet, don’t panic. We “Roll Out” the position—closing the current option and opening a new one further out in time. This resets your time decay clock and keeps you in the game.
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0.70 or higher to ensure the option tracks the stock closely
At least 90 days to avoid the rapid time decay of the final 30 days
Closing a nearing-expiry position and opening a new one further out to reset the clock
To master this, you need to understand how Delta and Theta interact over time. You can follow our step-by-step [Free Long Call Strategy Course] to see exactly how we set these trades up on a live platform.