Understanding options pricing: What drives premiums

Every option has a price, and that price tells a story.

The premium you see on an options chain reflects the contract's terms and the market conditions around it, but the price you can actually transact at comes from a live bid or ask rather than a formula alone. Understanding what sits behind a premium helps you compare contracts, interpret quotes and avoid mistaking a low price for good value.

Key Takeaways:

• A premium can be broken into intrinsic value, which reflects the option's current advantage relative to the underlying price, and extrinsic value, which captures time, volatility and other factors.

• Underlying price, strike, time remaining, a volatility assumption and financing assumptions all shape a model's estimate of an option's value, while live bids and asks also reflect supply, demand and liquidity.

• A smaller premium does not, by itself, make an option better value.

What is an option premium?

The premium is the price of an option contract. When you look at a quote, the premium is stated per unit of the underlying asset. The total amount a buyer pays depends on the execution price and the quantity of underlying the contract covers. Any applicable trading or delivery fees are separate from the premium itself.

Three related but distinct numbers appear in options markets. A model estimate is a theoretical value derived from a pricing model's inputs. A reference or mark price is a benchmark that a platform may calculate from model-based or market-based methods, often used for margin and unrealized profit-and-loss purposes. An executable bid or ask is the actual price at which another participant is willing to trade. The premium a buyer ultimately pays is determined by the price at which the order fills, not by a model alone.

For a detailed breakdown of how fees, breakeven and final profit or loss are calculated, see Bybit Options costs and P&L: What buyers pay.

How do intrinsic and extrinsic value make up an option price?

Every option premium can be split into two components: intrinsic value and extrinsic value.

Intrinsic value measures how far in the money an option currently sits. For a call, intrinsic value is the positive difference between the underlying reference price and the strike price. For a put, it is the positive difference between the strike and the underlying reference price. If that calculation produces a negative number, intrinsic value is zero rather than negative.

Extrinsic value is whatever remains of the premium after subtracting intrinsic value. It reflects the market's assessment of factors such as time, volatility and other conditions that could shift the option's value before it expires.

Consider an illustrative BTC call with a strike of $95,000 when BTC's reference price is $100,000 and the premium is $8,000 per 1 BTC of underlying (these figures are hypothetical, not a live Bybit quote):

Being in the money means the option has positive intrinsic value. It does not establish net profit, because the buyer paid a premium and may owe fees. Whether a trade is profitable depends on the relationship between the premium paid, the settlement or exercise outcome and any costs.

How are options priced?

Pricing models use a set of inputs to estimate what an option should be worth. The table below summarizes the main factors and their usual directional effect on call and put premiums when other inputs are held constant.

Volatility deserves extra attention. In a pricing model, volatility is an input: higher assumed volatility generally increases both call and put values, all else equal. In live markets, implied volatility (IV) is the volatility level backed out from an observed option price using a model. A higher IV reflects a market price consistent with wider expected moves. IV is a model-derived measure, not an independent input that the market sets directly.

Time decay isn't constant and can change as expiry approaches and as the option's moneyness changes. Similarly, a high IV does not predict which direction the underlying will move.

For a deeper look at implied volatility and the sensitivity measures known as the Greeks, see the dedicated IV and Greeks lessons.

Why can a live option quote differ from a model price?

A pricing model produces a theoretical estimate based on its assumptions, but a trade happens at the price two parties agree on. Several factors cause live quotes to diverge from model values.

Bids and asks are the prices at which market participants are willing to buy and sell. The gap between them is the bid-ask spread, and it reflects the cost of liquidity. In a liquid market with many participants, spreads tend to be narrower and quotes stay closer to model estimates. In a less active contract, a wider spread means the executable price may sit meaningfully above or below the model's estimate.

Market makers and other liquidity providers set their bids and asks based on their own models, hedging costs and inventory. Their quoted prices incorporate real-world frictions that a simplified model may not capture.

Supply and demand also play a role. If many traders want to buy a particular strike or expiry, bids may push the traded price above the model estimate. The reverse applies when sellers dominate.

How to compare option premiums

When evaluating options, a lower premium alone does not signal better value. A cheaper contract may simply be farther out of the money, have less time value, or both. Its lower premium does not necessarily mean it offers better value.A practical comparison involves several steps:

• Hold the underlying and your market view constant. Decide whether you expect a move in a particular direction, a range-bound market or a volatility shift before comparing contracts.

• Inspect strike and expiry together. All else equal, a lower-strike call will generally carry a higher premium. A shorter-dated option will generally carry less time value, but leaves less time for the expected move to play out.

• Compare premium alongside IV. Two contracts on the same underlying can carry different implied volatilities. A higher IV indicates that the observed option price is consistent with wider expected moves.

• Check the bid-ask spread. A contract with a tight spread lets you enter and exit closer to the mid-price. A wide spread adds an implicit cost that the headline premium does not show.

Why can an option lose value even when the market moves your way?

An option's price depends on multiple inputs at once, and they can pull in opposite directions. A call buyer who sees the underlying rise may still find the option's premium falling if time decay or a drop in implied volatility offsets the directional gain.

All else equal, less time remaining generally reduces extrinsic value. If IV also contracts, perhaps because an anticipated event has passed, the premium can decline even though the underlying moved in the expected direction. The net effect depends on the size and timing of each factor's contribution.

Options buyers should also be aware that the maximum loss on a long position is the entire premium paid, plus any applicable fees. Language such as "low risk" or "guaranteed profit" does not apply to options trading.

The bottom line

An option premium is more than a single price. It reflects intrinsic and extrinsic value, shaped by factors such as the underlying price, strike, time and volatility, while the price you can actually trade depends on the live market. Once you understand those layers, it becomes easier to compare contracts and see why a cheaper option is not necessarily better value. Explore current Bybit Options to see how premiums, IV and bid/ask prices differ across strikes and expiries.

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