PCR ratio: put-call ratio meaning, formula and how to read it for NIFTY
What the PCR ratio means
The PCR ratio, or put-call ratio, compares how many put options are open (or traded) against how many call options. For NIFTY it is usually calculated on open interest for a single expiry: total put OI divided by total call OI. A PCR of 1.2 means there are 1.2 open put contracts for every open call contract.
Traders use the put-call ratio as a quick read of positioning in the option chain. It does not tell you where price will go. It tells you how option writers and buyers are positioned right now, and how that positioning is changing through the session.
The PCR is one column of a wider picture. If you are new to OI, read how to read the NIFTY option chain first.
Volume PCR = total put volume traded ÷ total call volume traded
Change-in-OI PCR = change in put OI ÷ change in call OI (same period)
PCR ratio formula and the three versions
OI PCR
The most common version. Add up open interest of all puts for the chosen expiry, divide by the open interest of all calls. Because OI is a stock of open positions, OI PCR changes slowly and reflects accumulated positioning.
Volume PCR
Put contracts traded divided by call contracts traded over the session. Volume includes positions opened and closed, and intraday scalping, so volume PCR is noisier and more reactive. It reflects activity, not commitment.
Change-in-OI PCR
Put OI added today divided by call OI added today. This strips out old positions and shows what is being built in the current session. If put OI rises by 40 lakh contracts and call OI by 20 lakh, the change-in-OI PCR is 2.0, even if the overall OI PCR is only 0.9.
| Version | Measures | Speed | Best for |
|---|---|---|---|
| OI PCR | Open positions | Slow | Overall positioning for the expiry |
| Volume PCR | Trading activity | Fast, noisy | Spotting bursts of put or call activity |
| Change-in-OI PCR | Fresh positions today | Medium | Intraday shifts in writer behaviour |
Why PCR is usually read through option writers
In Indian index options, a large share of open interest is held by option sellers (writers), who need more margin and tend to be larger, better-capitalised participants. Many traders therefore read PCR from the writers' side.
- Rising put OI is often read as put writing: sellers are willing to collect premium betting that price stays above those strikes, which implies support below.
- Rising call OI is often read as call writing: sellers expect price to stay below those strikes, implying resistance above.
So a rising PCR is commonly interpreted as writers adding more puts than calls, a bullish-leaning tilt, while a falling PCR suggests more call writing. This is a convention, not a fact. Some put OI is bought as a hedge against long portfolios, and some call OI is bought for upside. That ambiguity is the main reason PCR should never be read alone.
What is a good PCR ratio for NIFTY?
There is no single good number. Each index has its own normal range, and that range drifts over time with market structure and expiry cycles. As a rough guide used by many traders:
| OI PCR | Common reading |
|---|---|
| Below 0.7 | Heavy call writing or put unwinding; bearish-leaning positioning, but can also mean pessimism is stretched |
| 0.7 – 1.0 | Neutral to mildly cautious |
| 1.0 – 1.3 | Put writers more active; bullish-leaning positioning |
| Above 1.3 – 1.5 | Very heavy put writing; can signal stretched optimism and a market vulnerable to a pullback |
Notice the extremes. PCR is often treated as a contrarian gauge at extremes: when almost everyone has written puts, there may be few new put writers left, and a fall could force them to cover. In the middle of the range it is treated as a trend-confirming gauge. Compare today's reading with the last few weeks of the same index rather than with a fixed textbook number.
How to read PCR step by step
- Choose the expiry. Use the nearest weekly for intraday work and the monthly for swing context. Mixing expiries blurs the picture.
- Note the opening OI PCR. This is yesterday's accumulated positioning.
- Track the change-in-OI PCR through the day. Is fresh writing leaning to puts or calls?
- Check where OI sits by strike. A PCR of 1.2 driven by puts at strikes far below spot is weaker support than puts concentrated one or two strikes below.
- Compare with price. PCR rising while price rises supports the move. PCR rising while price falls may mean puts are being bought as protection, not written. See OI buildup analysis.
- Check volatility. Rising implied volatility alongside put OI points to hedging demand rather than calm put writing.
PCR with other option chain tools
Strike-wise PCR
Dividing put OI by call OI at each strike shows which strikes writers defend most. A strike with a PCR above 2 near spot is often watched as support; one well below 0.5 as resistance.
Max pain
Max pain uses the same OI to find the strike where option buyers lose the most at expiry. When PCR and max pain both point to the same area, traders give that area more weight.
Price structure and order flow
Option positioning is slow; price is fast. Combine PCR with structure from key levels and liquidity and with intraday order flow such as cumulative delta. If PCR leans bullish but futures delta is persistently negative at a level, positioning and actual aggression disagree.
Gamma exposure
Large OI clusters also shape dealer hedging. The gamma exposure guide explains why heavy OI strikes can pin price near expiry.
Worked NIFTY PCR example (illustration)
The figures below are invented for illustration.
At 9:15 IST NIFTY spot is 24,400. The weekly expiry OI PCR opens at 0.92. By 11:30, put OI at 24,300 and 24,200 has grown sharply, and call OI at 24,500 has grown a little. The change-in-OI PCR for the day is 1.8, and the overall OI PCR rises to 1.05. Price holds above 24,350.
A trader reads this as fresh put writing below spot, with writers willing to sell 24,300 puts. That suggests participants are treating 24,300 as a support area for now. At 13:45, price drops to 24,310 and put OI at 24,300 starts falling while put premiums rise. The PCR slips back to 0.97. That shift suggests some writers are covering; the support is being tested, and the earlier reading may no longer hold.
The lesson is that the PCR number changed less than the story behind it. Watching where and how OI changes was more informative than the single ratio.
Common mistakes with the put-call ratio
- Reading PCR as a direct forecast. It describes positioning; it does not predict price.
- Ignoring who holds the OI. Put OI from hedgers and put OI from writers mean different things.
- Mixing expiries. All-expiry PCR mixes weekly scalps with monthly hedges.
- Using fixed thresholds. 1.3 may be extreme in one month and normal in another.
- Reacting to every tick. OI updates in batches; minute-to-minute PCR changes are often noise.
- Forgetting risk. Option prices react to volatility and time decay as well as direction. Trading F&O carries a high risk of loss.
Seeing it on the TradingMarble chart
The TradingMarble platform shows a live option chain with OI, change in OI and PCR next to the price chart, so you can compare positioning with price structure on one screen. You can study how PCR shifted as price approached a level and how futures order flow behaved at the same time. See plans for which views are included.
PCR checklist
- Expiry chosen; weekly for intraday, monthly for swing.
- OI PCR compared with its own recent range, not a fixed number.
- Change-in-OI PCR checked for today's fresh positioning.
- Strike-wise OI reviewed near spot.
- PCR direction compared with price direction and IV.
- Cross-checked with structure and order flow before drawing any conclusion.
The PCR ratio is a compact summary of option positioning for NIFTY and BANKNIFTY. Read it through writers' behaviour, compare it with its own history, and treat it as context around price rather than a reason on its own.
Frequently asked questions
What is the PCR ratio in the stock market?
PCR, or put-call ratio, is put open interest divided by call open interest for an underlying and expiry. It summarises how option positions are split between puts and calls. Traders use it to judge whether option writers lean towards expecting support (more put writing) or resistance (more call writing).
What is a good PCR ratio for NIFTY?
Many traders treat a NIFTY OI PCR between about 0.8 and 1.2 as a balanced zone, above 1.3 as heavy put writing and below 0.7 as heavy call writing. Extremes are often read as stretched sentiment. Normal levels drift over time, so compare today's PCR with the last few weeks rather than relying on a fixed number.
Is a high PCR bullish or bearish?
A moderately high PCR is usually read as bullish-leaning because it implies more put writing, with sellers expecting price to stay above those strikes. A very high PCR is often seen as contrarian, since positioning may be crowded. The meaning depends on whether puts are being written or bought as hedges, so check price and IV.
What is the difference between OI PCR and volume PCR?
OI PCR uses open interest, the number of contracts still open, so it shows accumulated positioning and changes slowly. Volume PCR uses contracts traded during the session, including those opened and closed the same day, so it shows activity and is much noisier. Most option chain analysis uses OI PCR.
How is change-in-OI PCR calculated?
Divide the change in put OI by the change in call OI over the same period, usually since the previous close. It isolates positions built today. A change-in-OI PCR far above the overall PCR shows that fresh activity is leaning heavily to puts, even if older positions are balanced.
Should I use PCR for BANKNIFTY the same way as NIFTY?
The method is the same, but BANKNIFTY has its own normal range and tends to swing more because of larger intraday moves and different participation. Track BANKNIFTY PCR against its own history and expiry cycle rather than borrowing NIFTY thresholds.