Every option contract in your portfolio behaves like some number of shares — not a nominal 100, but a dynamic number that moves as price and volatility shift. That number is delta × 100. Reading delta as "equivalent share exposure" is the single most useful mental model for sizing options risk.

Delta Is a Share Count in Disguise

A call with delta 0.30 is not "one contract" — it is economically equivalent to 30 shares of the underlying. If the stock moves $1, the option's value moves roughly $30 (before gamma, theta, vega adjustments). Multiply the contract count by delta × 100 and you have your real share-equivalent exposure.

0.15
Far OTM · low conviction
~15 equivalent shares per contract. Cheap premium, low probability of finish-ITM. Sells here collect thin premium; buys here are lottery tickets.
0.30
OTM · the seller's zone
~30 equivalent shares. The classic cash-secured-put or covered-call zone — enough premium to matter, low enough probability of assignment to be manageable.
0.70
Deep ITM · acts like stock
~70 equivalent shares. Behaves almost like holding the underlying. Vega and theta exposure are much smaller than people assume; if you want stock exposure, just buy the stock.

The Math You Actually Run

Before placing any options order, compute two numbers:

  1. Equivalent shares = contracts × delta × 100. This tells you how much stock exposure you are adding.
  2. Equivalent notional = equivalent shares × underlying price. This tells you the dollar risk if the stock moves meaningfully.

Example: sell 2 cash-secured puts on a $150 stock at 0.30 delta. Equivalent shares = 2 × 0.30 × 100 = 60. Equivalent notional = 60 × $150 = $9,000. That is your real position size — not the $200 premium collected.

A portfolio that looks "small" by contract count can be huge by equivalent-share exposure. Most blow-ups in options come from traders who sized by premium collected, not by delta × share count.

Where to See Delta in the App

Two places. Positions page shows raw per-option delta as a column — multiply by 100 × your contract count to get equivalent shares. Risk Report (opens via modal from the Positions page) goes further: per strategy group it shows Delta-$ exposure = net delta × underlying price, so you can read share-equivalent risk in dollar terms directly without the multiplication step.

Delta × 100 = equivalent shares per contract
Size by share exposure, not by premium collected
Positions table = raw delta · Risk Report = Delta-$ per strategy group

Open Positions + Risk Report →