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What is an option's premium, in plain words?

The premium is what the buyer pays for an option: quoted a share, paid up front to the seller, and non-refundable 1. A contract generally covers 100 shares 1, so a premium of $1.80 costs $180 a contract. It is made of intrinsic value and time value 2.

A $50 stock and its calls at 30% implied volatility (made-up numbers). Change the strike and the days left, and see the premium a share and a contract.

Source: the StrikePath engine, pricing with the Black–Scholes formula 3 at 4.3% interest a year; a simulated example, not market prices. For learning; not advice.

What sets it

The stock's price, the strike, the time left and implied volatility set the premium, with dividends and interest having a smaller effect 2. The $50 call with 30 days left at 30% comes to $1.80 by the formula 3.

Buyer and seller

The most the buyer can lose is the premium; the seller collects it and takes on the obligation, which for some option writing can mean losses without limit 1.

What this shows, and what it doesn't

Model prices, before fees. A real premium is quoted as a bid and an ask; a market order to buy generally fills at or near the ask 4.

Go further

How much does one option contract cost? →The quote times 100.How are option prices calculated? →What goes into the premium.
Sources (4), checked 20 October 2026 and 27 October 2026
  1. US Securities and Exchange Commission, Investor.gov, “An Introduction to Options” (investor bulletin, updated 16 July 2026). Read it (read 20 October 2026)
  2. The Options Industry Council, “Options Pricing”. Read it (read 27 October 2026)
  3. Fischer Black and Myron Scholes, “The Pricing of Options and Corporate Liabilities”, Journal of Political Economy 81(3), 637–654, 1973. Read it (read 20 October 2026)
  4. US Securities and Exchange Commission, Investor.gov, “Types of Orders”. Read it (read 20 October 2026)

Now try it on a scenario of your own

Pick where a simulated stock might be, and by when: drag one dot and see, side by side, what buying shares, one option, or a pair of options (a call or put spread) would each do. Free, no sign-up.

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