An option chain is the menu of every available contract for a stock. It can look intimidating at first, but once you know what each column means it tells you the price, the liquidity and the market’s expectations at a single glance.
Open the Long Call calculator →Calls are usually listed on the left, puts on the right, with the shared strike prices running down the middle. Each row is one strike for one expiration date.
Always pick an expiration first, then read across the strikes near the current stock price — those at-the-money rows are where most trading happens.
Bid and Ask are the prices you can sell and buy at; the mid-price between them is your realistic fill, and a wide gap signals poor liquidity. Last is simply the most recent trade.
Volume is how many contracts traded today and Open Interest is how many remain open — higher numbers mean a more liquid contract that is easier to enter and exit.
Implied Volatility shows the market’s expected move priced into that strike, and Delta gives a quick read on directional exposure and rough probability.
Favour strikes with tight bid/ask spreads and healthy volume and open interest, so you are not giving up edge just to get filled.
Compare IV across strikes to see the skew, and use the at-the-money options as your reference point for the stock’s expected move.
Volume is contracts traded today; open interest is the total number of contracts currently open. Both being high signals good liquidity.
Aim for the mid-price or better. On liquid contracts you can often get filled near the mid; on illiquid ones you may have to give up some edge.
That is the volatility skew — the market often prices downside puts with higher IV than upside calls because of demand for protection.
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