What is Max Pain?
Max Pain (also called the Options Pain Point) is the strike price at which the total dollar value of outstanding options contracts (both calls and puts) reaches its minimum. In theory, the underlying stock tends to gravitate toward the max pain strike at expiration as market makers hedge their books, causing maximum loss to options buyers in aggregate. While empirically debated, many traders use max pain as a reference point for where the stock "wants" to be at expiry. It is most commonly applied to large-cap stocks with heavy open interest near expiration. The calculation requires open interest data for all strikes; this tool uses manual OI input per strike.
Formula
For each strike K:
Call Pain = Σ OI_call(K_i) × max(0, K_i − K) for all K_i < K
Put Pain = Σ OI_put(K_i) × max(0, K − K_i) for all K_i > K
Total Pain(K) = Call Pain + Put Pain
Max Pain Strike = K with minimum Total Pain
Calculator
| Strike | Call OI | Put OI |
|---|---|---|
How to Use
- 1Gather open interest: For each available strike, enter the call OI and put OI from your broker's option chain.
- 2Add strikes: Include all strikes with meaningful open interest, typically within 10-15% of the current stock price.
- 3Calculate: The tool computes total pain at each strike and identifies the minimum: that is the max pain point.
- 4Use as reference: Max pain is a reference, not a guarantee. It is most useful in the final week before expiration when pinning effects are strongest.
Worked Example
Example: Three-strike simplified example
Strike $145
2,000 puts
Strike $150
5,000 calls/puts
Strike $155
3,000 calls
With most open interest concentrated at $150, the max pain calculation typically produces the $150 strike as the pain point. When OI is evenly distributed, max pain will cluster near the ATM strike. This becomes a more useful signal when one strike has dramatically more OI than adjacent ones.