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A practical, rule-based way to line up option writers' positions with your CPR levels before you pay a premium.
Quick Answer
To use open interest with CPR, mark the day's CPR levels first, then find the strikes with the highest call and put OI. Trade a Nifty or Bank Nifty option only when price breaks a CPR level in a direction that is not blocked by a heavy OI wall, and when change in OI supports the move. CPR gives you the entry and stop-loss; OI tells you how far the move can realistically run.
Definition
Open interest (OI) is the number of option or futures contracts that are still open and not yet squared off or expired. CPR (Central Pivot Range) is a band of three levels, Pivot, Top Central (TC) and Bottom Central (BC), calculated from the previous session's high, low and close.
Most option buyers look at one tool and hope it is enough. CPR shows where price may react; OI shows where option writers are concentrated. Using open interest with CPR gives you two independent views of the same market, and a trade is worth taking only when both agree. I personally prefer to trade Nifty 50 options, so the examples below use Nifty, and I then show how the same logic adapts to Bank Nifty.
If you are new to CPR, start with the CPR calculator to get your daily levels. If you trade premium charts, my guide on Premium CPR on call and put option charts pairs well with this article.
Open interest shows how many contracts are still open at each strike, which tells you where positions are concentrated. It does not tell you who is right, and it does not predict direction on its own.
Every time a new buyer and a new seller create a contract, OI rises by one. When both close, it falls by one. If one trader hands his position to another, OI does not change. This is why OI is different from volume: volume counts everything traded today, while OI counts what is still alive.
One limit to keep in mind: OI counts both sides of every contract, so it cannot tell you whether a writer is outright bearish or simply hedging another position. Treat OI as a map of crowded levels, not as a signal to buy or sell. You can see strike-wise OI and change in OI on the NSE option chain page and in most broker platforms. The option chain shows OI in contracts, so with a Nifty lot of 65 units (verify the current lot size on NSE), 1 lakh contracts equals 65 lakh units.
Rising OI with a move in price means fresh positions are backing that move, while falling OI means positions are being closed. Reading OI and price together separates real trends from short covering.
| Price | OI | What it usually means | How I treat it |
|---|---|---|---|
| Up | Up | Long build-up: fresh buying | Supports a call-buying idea if CPR also breaks up |
| Down | Up | Short build-up: fresh selling | Supports a put-buying idea if CPR also breaks down |
| Up | Down | Short covering: shorts exiting | Weaker move; be quick on targets |
| Down | Down | Long unwinding: longs exiting | Weaker move; avoid chasing |
In options, apply the same idea strike by strike. If call OI at 24,600 is falling while price rises through it, writers are covering and resistance there is weakening. If put OI at 24,500 keeps rising while price holds above it, support is strengthening. These readings are context, never a trigger by themselves.
CPR gives you precise levels for entry and stop-loss, but it cannot tell you whether the market is crowded at the next level. OI shows crowded strikes but gives no entry trigger. Together they answer both questions: where do I enter, and how far can I expect this to run?
CPR is calculated from the previous day's data:
A narrow CPR (TC and BC close together) generally points to a day with a higher chance of a directional move, while a wide CPR suggests a range-bound day. OI adds the second layer: if a narrow CPR breaks upward but a huge call OI wall sits just above, the move may stall early. If the same breakout has room up to the next wall, the trade has space to work. My article on CPR with VWAP filters covers the confirmation side in more depth.
The framework has five steps: mark CPR, locate OI walls, check change in OI, confirm with price and VWAP, then size the trade. If any step disagrees, skip the trade.
In this illustrative example, a narrow CPR breaks upward with a put wall below and a call wall well above, so there is room to run. The stop-loss is 30 index points and the target is 88 points, a risk-reward of about 1:2.9. All numbers are illustrative, not real market data.
Assume the previous session had High 24,620, Low 24,420 and Close 24,540.
| Level | Calculation | Value |
|---|---|---|
| Pivot | (24,620 + 24,420 + 24,540) / 3 | 24,527 |
| BC | (24,620 + 24,420) / 2 | 24,520 |
| TC | (2 × 24,526.67) − 24,520 | 24,533 |
| R1 | (2 × 24,526.67) − 24,420 | 24,633 |
| S1 | (2 × 24,526.67) − 24,620 | 24,433 |
TC minus BC is only about 13 points, so this is a narrow CPR.
| Strike | Call OI (lakh) | Change in call OI | Put OI (lakh) | Change in put OI | Reading |
|---|---|---|---|---|---|
| 24,400 | 2 | 0 | 14 | +1.8 | Put wall, below S1 |
| 24,500 | 5 | -1.2 | 11 | +2.5 | Call OI unwinding, put OI added: support building |
| 24,600 | 9 | +0.8 | 6 | +0.3 | Moderate resistance |
| 24,700 | 16 | +2.1 | 3 | -0.2 | Call wall, above R1 |
Put OI is being added at 24,500 right under price, call OI at 24,500 is unwinding, and the heavy call wall sits at 24,700, above R1. That gives room from the CPR breakout up to R1.
| Item | Value |
|---|---|
| Capital | ₹2,00,000 |
| Risk per trade (1%) | ₹2,000 |
| Index stop-loss | 30 points |
| Approximate option stop-loss (delta about 0.5) | 15 premium points |
| Quantity from risk | ₹2,000 / 15 = about 133 units |
| Nearest lot-multiple (lot size 65, verify on NSE) | 2 lots = 130 units |
| Actual risk | 130 × 15 = ₹1,950 |
| Approximate reward at 88-point target | 130 × 44 = about ₹5,720 |
The delta shortcut ignores gamma and theta, so real premium moves will differ. Use it for planning the size, not for predicting the exit price. The same setup in reverse works for puts: a narrow CPR breaking down, a put wall far below, and a call wall just above price.
The logic is the same for Bank Nifty, but the points are larger, the lot size is smaller and, as per current exchange rules, Bank Nifty options have monthly expiry only. OI walls therefore build over weeks rather than days. Verify the current lot size and expiry day on NSE before trading.
The practical changes I make for Bank Nifty:
| Item (illustrative) | Nifty example | Bank Nifty example |
|---|---|---|
| Lot size (verify on NSE) | 65 | 30 |
| Index stop-loss | 30 points | 120 points |
| Option stop-loss at delta 0.5 | 15 points | 60 points |
| Risk per trade | ₹2,000 | ₹2,000 |
| Quantity from risk | about 133 units | about 33 units |
| Lots taken | 2 lots (130 units) | 1 lot (30 units) |
| Actual risk | ₹1,950 | ₹1,800 |
For a daily shortlist of stocks with narrow CPR, you can also use the narrow CPR scanner.
The best setups have a narrow CPR, a clean break, and an opposing OI wall that is far enough away to leave a reasonable reward. Setups where a wall sits right on top of your entry are weak.
| Setup | CPR | OI picture | Verdict |
|---|---|---|---|
| Clean breakout up | Narrow, price closes above TC | Put OI building below, call wall far above | Strongest call-buying setup |
| Clean breakdown | Narrow, price closes below BC | Call OI building above, put wall far below | Strongest put-buying setup |
| Breakout into a wall | Narrow, closes above TC | Heavy call OI within 30-40 points above | Weak: little room. Skip or take a very short target |
| Inside CPR | Price chopping within TC and BC | Mixed OI on both sides | No trade |
| Wide CPR day | Wide, price near edges | Walls on both sides | Range-style day; avoid option buying |
The most common mistakes are treating OI as a direct buy or sell signal, using stale OI, and ignoring theta. Each has a simple fix.
| Mistake | Why it hurts | Practical fix |
|---|---|---|
| Reading high call OI as a sure resistance | Walls can be hedges and can be breached | Use walls as context; wait for price to react |
| Using only total OI, not change in OI | Old positions may no longer matter | Always check today's change in OI |
| Taking a CPR break with a wall just above | Move stalls before your target | Set the target below the wall or skip the trade |
| Ignoring time decay on expiry day | Premium can fall even if direction is right | Use less time-sensitive contracts when possible, reduce size |
| Over-sizing because the setup looks perfect | One loss can wipe out several wins | Fix risk per trade before looking at the chart |
Skip the trade when CPR, OI and price disagree, when a major event is due, or when your risk cannot be defined. Not trading is part of the strategy.
Mark CPR first, locate the strikes with the highest call and put OI, and trade only when a CPR break has room before the opposing OI wall. Use change in OI to confirm that positions are being built in the direction of the move.
No. High call OI is a reference level, not a guarantee. Writers may be hedged, and walls can be breached or unwound during the day, so confirm with price action.
Neither works best alone. CPR gives entry and stop-loss levels, while OI gives context on crowded strikes and available room. I use CPR for the trigger and OI for the filter.
Yes, the logic carries over. Adjust the stop-loss distance and lot size for the instrument, and check current expiry rules and lot sizes on NSE. Stock options need extra attention to liquidity.
The NSE option chain page and most broker platforms show OI and change in OI by strike. Check the data time stamp so you do not trade on stale numbers.
No. OI shows where positions are concentrated, not where price will go. Treat it as probability context combined with your price levels, never as a forecast.
Use CPR to decide where to act and OI to decide whether the move has room. If the two disagree, the best trade is no trade.
To keep your risk math consistent, use the stop-loss calculator for options, stocks and commodities.
Want to learn CPR step by step?
Join the CPR Brahmastra live webinar to see how I plan trades around CPR levels.
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