The put-call ratio, or PCR, is one of the most quoted numbers on Indian market commentary, especially around index expiries. It compares activity in put options with activity in call options and is often treated as a quick read of market sentiment.
This article explains how it is calculated, the difference between open-interest and volume versions, how traders interpret high and low readings, why those readings frequently mislead, and how to use the number sensibly.
How it is calculated
The ratio divides put activity by call activity, usually for an index or stock across all strikes of an expiry, or across all expiries.
Open-interest version: total put open interest divided by total call open interest. This reflects positions that remain open.
Volume version: total put contracts traded in a session divided by total call contracts traded. This reflects the day's activity, including positions opened and closed the same day.
Worked example: suppose an index expiry has put open interest of 6,00,000 contracts and call open interest of 5,00,000. The open-interest ratio is 6,00,000 divided by 5,00,000, or 1.2. If during the day 9,00,000 put contracts and 10,00,000 call contracts traded, the volume ratio is 0.9.
The two can point in different directions, as here. Most Indian commentary refers to the open-interest version unless stated otherwise. When you see the figure quoted, check which version it is and for which expiry, since a reading for the current week and one across all expiries can differ widely.
Many option chain screens show the figure for the selected expiry, and some show it strike by strike.
How traders read it
There are two opposite interpretations, which is the first warning sign.
The straightforward reading: more puts than call options means traders are more bearish, so a high ratio is bearish and a low ratio bullish.
The contrarian reading: extreme readings show crowd sentiment at an extreme, and crowds are often wrong at turning points. On this view, a very high ratio reflects excessive fear and may come near a bottom, and a very low ratio reflects complacency near a top.
The option writer reading, common in India: because a large share of open interest is created by option sellers, heavy put open interest is read as sellers being confident the market will not fall below those strikes, which is bullish. On this view, a rising ratio is supportive.
Commonly quoted thresholds, such as readings below about 0.7 or above about 1.3, are conventions rather than rules, and normal levels differ between instruments and periods.
Why it often misleads
Every contract has a buyer and a seller. Open interest tells you a position exists, not whether the bullish or bearish side initiated it. Heavy put open interest can mean many people bought protection, or many people sold puts expecting the market to hold. The same number supports opposite stories.
Hedging distorts it. Institutions and investors with large equity holdings buy index put options as insurance, regardless of their short-term view. That steadily lifts put open interest without signalling bearishness.
Expiry effects. As expiry approaches, positions are closed and rolled, and the ratio for a near expiry can swing sharply for mechanical reasons.
Aggregation hides detail. A total across all strikes treats far out-of-the-money options the same as at-the-money ones, though they mean very different things.
Hindsight makes it look better than it is. It is easy to find past moments where an extreme reading came before a turn, and easy to forget the many times it did not.
Using it with care
Watch changes, not single readings. A sharp shift from the instrument's usual range is more informative than whether today's number is above or below a fixed threshold.
Look at the strike-wise picture. Where large put and call open interest sits, and how it changes day by day, says more than a single total. Strikes with heavy open interest on both sides often mark the range that option sellers are positioned for.
Combine with price. A rising ratio while price also rises is a different situation from a rising ratio while price falls. Read open interest changes together with price and volume.
Use it as context, not a trigger. It may help frame a view, for example favouring a defined-risk directional structure when sentiment looks stretched, but it should never be the sole reason for a trade.
Index and stock readings differ. Index options carry heavy hedging demand from large holders, which tends to keep put open interest elevated. Stock options are thinner and less used for hedging, so their ratios can swing on a handful of large positions. A normal level for one instrument says little about another.
Test it honestly. If you want to rely on the ratio, record readings and subsequent moves over many months, including the times it failed, and see whether it adds anything after costs.
A short illustration
Illustrative only. Over a week, an index rises steadily from 23,800 to 24,200. The open-interest ratio for the current expiry rises from 0.9 to 1.3, with the largest put open interest building at 24,000 and the largest call open interest at 24,500.
One trader reads this as put sellers defending 24,000, supportive for the index. A contrarian reads the higher ratio as rising caution. Both observations are accurate; neither predicts the next move.
A more useful conclusion is narrower: option sellers appear positioned for a range between roughly 24,000 and 24,500 into expiry. That might inform strike selection or where to place stops, while remembering that positions can be closed in minutes and that news can carry the index through any strike.
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Frequently Asked Questions
What is the put-call ratio?
Put option activity divided by call option activity, measured either by open interest or by volume, for an index or stock. It is used as a rough gauge of options market positioning.
How is PCR calculated?
Open-interest PCR is total put open interest divided by total call open interest. Volume PCR is put contracts traded divided by call contracts traded in a session.
Is a high PCR bullish or bearish?
It depends on the interpretation. Some read it as bearish sentiment, contrarians as excessive fear, and others as put sellers expecting support. The same number supports opposite stories, so it should not be read alone.
Why can PCR be misleading?
Open interest does not show which side initiated a position, hedging lifts put open interest regardless of view, expiry rolls cause mechanical swings, and totals hide strike-level detail.
How should PCR be used?
As context: watch changes from the usual range, study strike-wise open interest, combine with price and volume, and test it before relying on it.
Related Reading
- A trend gauge from price itself
- A defined-risk directional structure
- Where the open interest figures come from
- Volume and open interest compared
- Another open interest theory, tested
- The market's fear gauge
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
