Introductory Context
"Put-Call Ratio = Total Put OI ÷ Total Call OI. A high PCR means more put positions than call positions — contrarian interpretation is bullish. A low PCR means more call positions — contrarian interpretation is bearish. PCR is most useful at extremes, combined with price action, not as a standalone signal. "
The Formula
PCR = Total Put OI ÷ Total Call OI
For the current week's Nifty option chain, sum all the OI values in the put columns, sum all the OI values in the call columns, and divide. The result tells you the ratio of put exposure to call exposure across all strikes.
PCR can also be calculated using volume rather than OI: Volume PCR = Total Put Volume ÷ Total Call Volume. The volume-based PCR gives a shorter-term (today's) sentiment read, while the OI-based PCR gives a cumulative positioning read. Most professional use refers to the OI-based PCR unless specified otherwise.
PCR Calculation Example
Nifty option chain: Total call OI across all strikes = 3.2 crore contracts. Total put OI = 4.1 crore contracts. PCR = 4.1 ÷ 3.2 = 1.28. This tells you there is 28% more put OI than call OI across the chain. More put positions have been opened than call positions.
The Interpretation — Direct and Contrarian
The Direct Read (What PCR Literally Says)
PCR measures the balance of put and call positioning:
• PCR above 1: more puts than calls are open. More participants have opened put positions than call positions.
• PCR below 1: more calls than puts are open. More participants have opened call positions.
• PCR = 1: exactly balanced — equal put and call OI.
The Contrarian Read (How Professionals Use PCR)
The more useful interpretation of PCR is contrarian — it works because of how options markets are structured. The majority of put positions are opened by options sellers collecting premium (not directional put buyers). When put OI is very high (PCR above 1.2–1.3), a large number of put sellers are positioned for the market NOT to fall — they have sold puts and collected premium, expecting the underlying to stay above those put strikes.
This means: high PCR = many sellers have positioned against a significant decline = structural support below the market = contrarian bullish signal.
Conversely, low PCR (below 0.8) = many call sellers have positioned against a significant rally = structural resistance above the market = contrarian bearish signal.
The PCR Thresholds
PCR above 1.5: extreme put positioning — contrarian strongly bullish signal. PCR 1.2–1.5: elevated put positioning — mildly bullish contrarian. PCR 0.8–1.2: neutral range — no strong contrarian signal. PCR 0.6–0.8: elevated call positioning — mildly bearish contrarian. PCR below 0.6: extreme call positioning — contrarian strongly bearish signal. These thresholds are indicative and must be compared to the recent historical range for Nifty — what is 'extreme' changes with market conditions.
PCR Limitations — The Critical Context
Limitation 1: PCR Doesn't Distinguish Buyers from Sellers
High put OI can reflect either: (a) many put buyers who are directionally bearish, or (b) many put sellers who are bullish income generators. Both create put OI — but they have opposite directional implications. The PCR cannot distinguish between these two compositions. In Indian markets, the majority of OTM put OI is from sellers (income generation, portfolio hedging), making the contrarian interpretation generally more appropriate. But during fear events or before major negative catalysts, directional put buying can dominate.
Limitation 2: PCR Changes Rapidly
PCR is a snapshot of current positioning — it can change significantly within hours as large institutions adjust their books. A PCR of 1.4 Monday morning can become 0.9 by Monday close if FIIs sell large put positions and buy calls simultaneously. Always check the current PCR rather than relying on a number from earlier in the session or a previous day.
Limitation 3: PCR Works at Extremes, Not in the Middle
A PCR of 1.05 provides little signal — it is in the neutral range where contrarian logic does not give a strong directional read. PCR signals are most useful at extremes (above 1.4 or below 0.7). In the neutral middle range, other signals (OI buildup/unwinding, chart technicals, VIX) should dominate the analysis.
PCR is a useful indicator in the same way a thermometer is useful — it gives you a reading, but the reading needs context to be meaningful. 37°C could be normal body temperature or a mild fever depending on the context. A PCR of 1.3 could signal bullish contrarian opportunity or simply a normal pre-expiry put-heavy market. PCR in context — combined with price action, OI buildup/unwinding analysis, and VIX — provides a complete picture. PCR alone provides a partial one.