For a call option, moneyness is calculated by taking the underlying asset’s price and subtracting the option’s strike price. If that is a positive value, the call option is in-the-money. If it is a negative value, the call is out-of-the-money. The moneyness definition describes an option’s strike price relative to its underlying stock’s market price. The underlying asset price has to be above the strike price for a call to be in-the-money.
For a put option, the opposite is true: Moneyness is calculated by taking the underlying asset’s price and subtracting the option’s strike price. If that is a positive value, the put option is out-of-the-money. If it is a negative value, the put is in-the-money. The underlying asset price has to be below the strike price for a put to be in-the-money.
An at-the-money option is simple when the stock price and strike price are the same. Near-the-money options have strikes very close to the share price.