Start with a simple idea
An option is a right, not an obligation. You pay a small amount today (the premium) for the right to buy or sell something at a fixed price (the strike) until a fixed date (the expiry).
- A call is the right to buy at the strike. Calls tend to gain value when the underlying rises.
- A put is the right to sell at the strike. Puts tend to gain value when the underlying falls.
The person selling you that right (the writer) collects the premium and takes on the obligation.
Where the premium comes from
Every option premium has two parts:
- Intrinsic value — how much the option is already “in the money.” If Nifty is at 24,200 and you hold a 24,000 call, it has ₹200 of intrinsic value.
- Time value — everything else. It is the market's price for possibility: the chance the option becomes more valuable before expiry. More time and more expected volatility mean more time value.
An out-of-the-money option (say a 24,500 call with Nifty at 24,200) is all time value. If nothing happens, that value melts to zero by expiry.
The clock is not neutral
Time value does not decay in a straight line. It decays slowly far from expiry and fast in the final days — the effect traders call theta. This is why a buyer can be “right” about direction and still lose money: the move came too late or too small to beat the melt.
Sellers experience the mirror image: time works for them, but a sharp move can hurt quickly. Neither side is “better”; they are different trade-offs.
Vocabulary to know
- ATM / ITM / OTM — at, in or out of the money relative to the strike.
- Lot size — options are traded in fixed lots; your real exposure is premium × lot size.
- Open interest (OI) — the number of contracts outstanding at a strike. The Options page on this site lets you see where OI is building.
- PCR — put-call ratio, a rough gauge of positioning.
A learning exercise
Use the free Intrinsic Value Calculator on the Tools page: enter any strike and premium, split it into intrinsic and time value, and watch how the split changes with the spot price. Doing this twenty times teaches more than any definition.
This is a conceptual lesson, not a trade idea. Options carry a real risk of losing the whole premium — or more, for sellers.
Educational only, not investment advice. Arijit Capital is not SEBI registered. This lesson explains concepts for learning; it is not a recommendation to buy, sell or hold anything.
