Ryan Tanaka

How to Read an Options Chain

Every broker shows you the same wall of numbers, and it looks like a spreadsheet designed to scare you off. It is not. Below is a sample call chain for TSLA at a $420 spot price, then a plain-English guide to what every single column means. Once you know the columns, every chain reads the same.

Sample call chain - TSLA, spot $420, 45 days to expiration

Strike	Bid	Ask	Last	Volume	Open Interest	IV	Delta
380ITM	52.25	53.50	52.90	1,240	9,320	51.0%	0.74
390ITM	45.00	46.10	45.50	2,015	10,880	49.5%	0.70
400ITM	38.35	39.00	38.60	4,182	18,940	48.0%	0.65
410ITM	32.00	32.60	32.25	3,050	12,415	46.5%	0.59
420ATM	26.15	26.75	26.45	9,760	27,300	45.0%	0.53
430OTM	21.15	21.80	21.45	5,620	15,880	44.0%	0.47
440OTM	17.05	17.70	17.40	3,905	21,060	43.5%	0.41
450OTM	13.65	14.25	13.90	2,470	12,540	43.2%	0.35
460OTM	10.85	11.45	11.20	1,180	8,760	43.0%	0.30

Illustration only. Prices are modeled with Black-Scholes (rates set to zero) and the volume / open-interest figures are made up but plausible. A real chain updates every second and usually shows puts side-by-side with calls.

What every column and term means

Expiration date

The day the option dies. After it, the contract is gone. Every chain is grouped by expiration; here we show one dated 45 days out.

Strike price

The price you get to buy (call) or sell (put) the stock at if you exercise. The left-most column, one row per strike.

Calls vs Puts

A call profits when the stock rises; a put profits when it falls. Most brokers list them on opposite sides of the same strike.

Bid

The highest price a buyer is willing to pay right now. If you sell to close, this is roughly what you get.

Ask

The lowest price a seller will accept right now. If you buy, this is roughly what you pay.

Last

The price of the most recent trade that actually happened. It can be stale if the contract has not traded in a while.

Mark / Mid

The midpoint between bid and ask. A fair estimate of the contract's value and, in practice, close to your realistic fill price.

Volume

How many contracts traded today. High volume means the strike is active and generally easier to get in and out of.

Open Interest

How many contracts are currently open (not yet closed). A running total, not a daily count. More open interest usually means tighter spreads.

Implied Volatility (IV)

The market's guess at how much the stock will swing, expressed as a yearly percentage. Higher IV means pricier options.

Delta

Roughly how much the option's price moves per $1 move in the stock. A 0.53 delta gains about $0.53 per share for a $1 rise. It is also a rough guide to the odds of finishing in the money.

Gamma, Theta, Vega

The other Greeks: gamma is how fast delta changes, theta is the daily time-decay you lose, vega is sensitivity to a change in IV.

In / At / Out of the money

A call is in the money when the strike is below the stock, at the money near it, and out of the money above it. Puts are the mirror image.

Intrinsic vs time value

Intrinsic value is what the option is worth if exercised today; time value is the extra you pay for the chance it moves further before expiration.

How to actually read it, step by step

Pick the expiration first. Options are grouped by date; choose one that gives your idea enough time to play out.
Find your strike. Scan the strike column to the price you care about relative to where the stock is now.
Read the mark price. Take the midpoint of bid and ask. That number is per share, and one contract covers 100 shares, so multiply by 100 for the real dollar cost.
Check volume and open interest. Higher numbers generally mean better liquidity and a tighter bid-ask spread, so you lose less on the way in and out.
Remember your max loss. When you buy a call or put, the most you can lose is the premium you paid- nothing more.

Play with a live chain -> Options Chain Explorer Look up a term -> Options Glossary

Plain EnglishA chain is just a menu. Each row is one strike, each column is one fact about that contract- what it costs (bid, ask, mark), how much it trades (volume, open interest), and how it behaves (IV, delta). Learn the columns once and every broker's screen reads the same.

Three things to remember about the chain:

Prices are per share, not per contract. In practice you multiply the quoted price by 100 to get what one contract actually costs you.
Volume and open interest are a rough liquidity guide, not a promise. Higher numbers generally mean tighter spreads, but they can still move against you.
Delta is an estimate, not a guarantee. As a rough guide it tracks both price sensitivity and the odds of finishing in the money, but both shift as the stock and time change.

Taxes are not shown here. Options and the underlying stock are taxed differently, and it depends on your holding period and account type. None of this is tax advice.