PCR Ratio Explained: How Traders Read the Put-Call Ratio
The one number that measures the option market's mood — and why smart traders read it backwards. Zones, formula and the mistakes that ruin the signal.
PCR, or Put-Call Ratio, is the total put open interest divided by the total call open interest. A PCR of 1.2 means 120 puts exist for every 100 calls. Readings near 0.7 or below signal too much optimism. Readings near 1.3 or above signal too much fear. Traders read it backwards: extreme fear often marks a bottom, and extreme comfort often marks a top.
What Is the PCR Ratio?
The Put-Call Ratio answers one question: How is the options crowd positioned right now? It divides put open interest by call open interest. Puts are bets on or protection against a fall. Calls are bets on a rise. The ratio between them is a mood thermometer for the whole market.
The formula could not be simpler:
PCR = Total Put Open Interest ÷ Total Call Open Interest
If Nifty options carry 2.4 crore put contracts and 2 crore call contracts, the PCR is 1.2. Every number on an option chain feeds this single figure.
OI PCR vs Volume PCR
Two versions exist, and mixing them up causes bad reads:
- OI-based PCR uses open interest positions that are still alive. It shows how traders are committed. This is the version most analysts quote.
- Volume-based PCR uses the day's traded contracts. It shows what traders did today and swings wildly intraday.
For positional reads, OI PCR is the one that matters. Volume PCR suits only fast intraday work.
How to Read PCR Levels
| PCR (OI) | Crowd mood | Contrarian read |
|---|---|---|
| Below 0.7 | Heavy call buying, high optimism | Caution — rallies often stall here |
| 0.7 to 1.0 | Mildly bullish to neutral | No strong signal |
| 1.0 to 1.3 | Put hedging building up | Often supportive of the market |
| Above 1.3 | Heavy put buying, high fear | Bounce zone — bottoms often form here |
These bands are guides, not laws. Each index has its own normal range, and the useful signal is a move to the edge of that range, not the absolute number.
Why PCR Works Backwards
The contrarian logic puzzles newcomers. More puts sound bearish. Why is a high PCR often bullish?
Two reasons. First, most index puts are bought as insurance by investors who already own stocks. A market drowning in insurance has already done its selling; the fear is paid for. Second, every option bought is written by someone, usually a well-capitalised seller who profits when the panic fades. When puts pile up at one strike, those writers defend it, and the strike becomes support.
The same logic flips at the other end. A market with almost no puts has no insurance and no fear. That is when a small shock travels furthest. As the old floor saying goes, the market hurts the most people it can.
How Traders Use PCR in Practice
- As a filter, not a trigger. A trader bullish on a setup checks PCR. If it sits below 0.7, the crowd is already all-in, and the trade gets smaller size.
- With the option chain. PCR says "fear is high". The option chain's strike-wise data says where the walls of that fear stand.
- On expiry days. PCR shifts fast as positions unwind. Expiry traders track it alongside the rules in this guide to trading options on expiry day.
NSE publishes the underlying open interest data, and most trading platforms compute index PCR live.
Where PCR Misleads
1. Treating one number as a signal. PCR at 1.1 means nothing by itself. PCR jumping from 0.8 to 1.3 in three sessions means a lot. Track the change, not the level.
2. Using it on single stocks. Stock options are thin and lumpy; one large trade can distort the ratio. PCR is most reliable on index options, where lakhs of contracts smooth the data.
3. Forgetting expiry mechanics. Near expiry, PCR collapses and rebuilds as contracts roll over. A "crash" in PCR on expiry Thursday is plumbing, not panic.
Open interest data is published by NSE through the daily option chain. PCR bands above are working conventions among index traders, not official thresholds.