Max pain is the strike price at which option buyers, taken together, would lose the most money if the contract expired there. It is worked out from open interest: for every strike, add up what all in-the-money calls and puts would pay out, and the strike with the smallest total is the max pain point. Traders watch it on Nifty and Bank Nifty expiry days as a rough guide to where the index may settle.
Max pain, also called the max pain point, comes from the option chain rather than the price chart. The idea is simple. Most options expire worthless and the sellers keep the premium, so the expiry level that hurts buyers most also suits sellers most. Max pain is that level.
How max pain is calculated
Take every strike in the chain for one expiry. Pretend the index settles exactly at that strike. Work out how much every call below it and every put above it would pay, weighted by open interest. Repeat for each strike. The strike with the lowest total payout is the max pain point. Premiums already paid are ignored. Only intrinsic value at expiry counts.
A worked example
Suppose Nifty is near 22,000 and the weekly chain has five strikes from 21,800 to 22,200. Call open interest, in lakh contracts, is 5, 8, 20, 30 and 25. Put open interest is 28, 22, 18, 9 and 4. If the index settles at 21,800, calls pay nothing but puts pay 10,100 lakh points. At 22,200, puts pay nothing but calls pay 11,400. At 22,000, calls pay 1,800 and puts pay 1,700, a total of 3,500, the lowest of the five. So 22,000 is the max pain strike for that expiry.
How traders use it
On the live Nifty option chain, the max pain strike usually sits where the largest call and put open interest overlap. Sellers use it to pick strikes with a cushion. Buyers use it as a warning, since a drift back toward it late on expiry day is common. It is one input on an expiry day plan, not a target.
Why it matters to a SAHI trader
Max pain shifts as open interest builds and unwinds through the week, so check it on the day. Pair it with theta, which eats premium fastest in the final hours, and the India VIX, which shows whether the market expects a move big enough to push expiry well away from it.
Common mistakes
Treating max pain as a forecast is the biggest one. Big news or heavy futures buying can settle the index hundreds of points away. Reading it off a stale chain is another. The third is applying it to illiquid stock options, where a few large positions distort the result.
FAQs
Does the index always expire at max pain?
No. It is a tendency, not a rule. Expiry often lands near max pain in quiet weeks and well away from it in volatile ones.
Is max pain the same as the strike with the highest open interest?
Not always. Max pain uses open interest at every strike, weighted by how far each is in the money, so it can differ from the single strike with the biggest build-up.
Can max pain be used for Bank Nifty and stock options?
Yes, but it is most reliable on liquid index contracts. Thinly traded stock options give noisy results.
Who benefits from max pain?
Option writers, who keep the premium when contracts expire worthless. That is why some traders call it the sellers' level.