The more a stock (or underlying asset) moves, the greater the chance an option will end up “in the money”. That can make calls and puts more expensive when volatility is high. 

Implied volatility vs historical volatility 

Traders look at implied volatility (IV) to gauge expected future stock price movement. IV is built into an option’s price and reflects what the market “thinks” might happen. Historical volatility, on the other hand, shows how much a stock has moved in the past. 

If IV spikes, options typically become more expensive – even if the stock price stays the same. If IV drops, options tend to become cheaper, making them less attractive to option sellers. 

Example: Nvidia Stock 

Assume Nvidia (NVDA) stock is trading at $140. An investor wants to buy a one-month call option with a $150 strike price. 

• If the market expects low volatility, the premium might be $2 per contract. 
• If volatility surges – due to an upcoming earnings report or market uncertainty – the same option might cost $5 or more. 

Even if the stock stays at $140, the call option’s price can rise or fall depending on IV.  

Why it matters 

Traders often use volatility to time their entries. Buying options when volatility is high can be risky because IV might drop, deflating the premium. On the other hand, selling options in high-volatility environments can be more profitable – because premiums are higher. But high-volatility can also come with more risk. 

Key takeaways 

• Higher volatility tends to increase options premiums, making both calls and puts more expensive. 
• Implied volatility (IV) affects option prices, even if the stock doesn’t move. 
• Higher volatility can also bring more risk to options strategies.