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Moneyness describes where an option's strike sits relative to the underlying's current price — in-the-money, at-the-money, or out-of-the-money. It's one of the first things checked on any option chain, and it directly determines how an option's price splits between real, immediate value and the value of time still left on the clock.

• In-the-money (ITM) — the option has real, immediate value if exercised right now. A call is ITM when the strike is below the current price; a put is ITM when the strike is above it.
• At-the-money (ATM) — the strike is at (or very close to) the current price. Neither a call nor a put has any immediate exercise value here.
• Out-of-the-money (OTM) — the option has no immediate exercise value. A call is OTM when the strike is above the current price; a put is OTM when the strike is below it.

Calls and puts are opposite at the same strike — a strike below the current price is ITM for a call but OTM for a put, and vice versa above the current price. There's no strike that's ITM (or OTM) for both at once.

An option's total price always splits into two parts:

• Intrinsic value is the option's value if exercised this instant — for a call, that's the underlying's price minus the strike (or zero if that's negative); for a put, it's the strike minus the underlying's price (or zero if that's negative). It's never negative for an American-style option, and only an ITM option has any.
• Extrinsic value (also called time value) is everything else — the option's total price minus its intrinsic value. It reflects the chance the option could move further into the money before expiry, and it's what decays away as expiry approaches, which is exactly what Theta measures.

Using the same setup as the Delta, Gamma, Theta, and Vega pages: Nifty at 24,000, 7 days to expiry, 13% implied volatility:

Notice the call and put zones are exact opposites at every strike, as expected — 23,400 is ITM for the call and OTM for the put, while 24,600 flips that entirely. Also notice extrinsic value peaks at-the-money (₹187.62 for the call, ₹157.73 for the put) and shrinks the further a strike moves into or out of the money.

A genuinely advanced note, included for accuracy rather than left out: the deepest in-the-money put above shows a slightly negative extrinsic value (−10.84). This isn't a calculation error — it's a real, known property of European-style options (which, unlike American-style options, can't be exercised before expiry): a deep in-the-money put's fair price reflects the time value of eventually collecting that payout, so it can price marginally below the raw strike-minus-spot figure. It's a small, edge-case effect that mainly shows up for options that are both deep in-the-money and interest-rate sensitive.

• Strike selection starts with moneyness. A Long Call bought deep ITM behaves closer to owning the underlying outright (high Delta, as covered on the Delta page); bought far OTM, it's a cheaper, lower-probability bet on a large move.
• Credit strategies typically sell OTM options — a Short Strangle or Iron Condor sells strikes the underlying isn't expected to reach, collecting the extrinsic value as premium while betting it decays away.
• Long Guts and Short Guts specifically use crossed ITM strikes (covered on their own pages) rather than the more typical OTM strikes a strangle uses — a direct, deliberate use of moneyness to build a genuinely different payoff shape.

• "ATM" rarely means an exact match. The underlying moves continuously while strikes are fixed at set intervals, so the "ATM strike" in practice is usually just the closest available strike to the current price, not a perfect match.
• Moneyness changes as the underlying moves — a strike that's comfortably OTM today can become ATM or even ITM well before expiry if the underlying moves enough.
• Extrinsic value, not intrinsic value, is what decays with time — a deep ITM option's intrinsic value doesn't erode from Theta the way its extrinsic portion does.