Max Pain Explained: The Strike Where Options Expire Worthless
What Max Pain is, how it is calculated from open interest across strikes, what it suggests about where price may gravitate near expiry, and how to use it sensibly.
Max Pain is the strike price at which the largest number of options — calls and puts combined — would expire worthless, causing the maximum aggregate loss to option buyers (and therefore the maximum gain to option writers).
The idea behind it
Option writers (sellers) are typically large, well-capitalised participants, and they profit when the options they sold expire worthless. The Max Pain theory argues that, all else equal, price tends to gravitate toward the strike that hurts buyers most as expiry approaches — because that is where the open interest is stacked against them. It is a tendency, not a law.
How it is calculated
For every candidate strike, you sum the rupee value that all in-the-money calls and puts would be worth if price settled there — weighted by each strike's open interest. The strike with the lowest total payout to option holders is Max Pain. In practice a tool does this across the whole chain for you in real time.
How to use it
- Treat Max Pain as a magnet level to be aware of into expiry, especially on weekly expiry day when decay is fastest.
- Combine it with the support and resistance walls (largest put and call OI) — when they line up, the level is stronger.
- Do not trade it blindly: a strong trend, news, or a volatility spike overrides Max Pain easily. It is context, not a prediction.
See it live
Bullmatics computes Max Pain for NIFTY, Bank Nifty, Sensex and MCX in the OI analytics panel of the live option chain, updated through the day as open interest shifts.