What Is the Put-Call Ratio? How to Read It and Predict Market Trends

By Forex & Brokers DeskUpdated Nov 10, 2026

Definition

The put-call ratio divides puts traded by calls traded over a period, usually one day, to show whether options traders lean bearish or bullish on a market, index, or stock.

Key takeaways

The put-call ratio equals puts traded divided by calls traded, usually by volume and sometimes by open interest.
A reading of 1.0 is not neutral. Traders normally buy more calls than puts, so about 0.70 is the commonly cited average for equity options.
Readings above about 0.70, or a rising trend, point to bearish positioning. Readings toward 0.50 point to bullish positioning.
Momentum traders read the ratio as trend confirmation. Contrarians treat extreme readings as possible reversal signals.
It is a sentiment measure, not a timing tool, and extremes are best judged against the ratio's own history.

The put-call ratio (PCR, also written P/C ratio) divides the number of put options traded by the number of call options traded over a set period, usually one day. It measures how options traders are positioned. A higher ratio means more activity in puts, which are bets on or protection against falling prices. A lower ratio means more activity in calls, which profit from rising prices. Traders read it as a sentiment gauge for the whole market, an index such as the S&P 500, or a single stock.

What Is the Put-Call Ratio?

An option gives its holder a right, but not an obligation, to trade an underlying asset at a preset price before or at expiration. A call is the right to buy and gains value as the underlying rises. A put option is the right to sell and gains value as the underlying falls, so traders use puts to speculate on declines or to insure holdings.

The put-call ratio sets these two kinds of activity side by side. If traders buy noticeably more puts than usual, they are either expecting lower prices or paying for protection in case prices fall. Both point to growing caution. If call buying dominates, traders are positioning for gains.

The ratio can be built for different scopes:

Total market: all exchange-listed options, both equity and index.
Equity only: options on individual stocks, which reflect speculative and single-name activity.
Index only: options on indexes such as the S&P 500. Institutions use these heavily to hedge portfolios, so this ratio tends to run higher than the equity-only ratio.
Single security: the puts and calls on one stock or ETF. This shows sentiment specific to that name.

These versions behave differently, so compare a reading with the same version’s own history, not with another version.

How the Put-Call Ratio Works

Calculating Put-Call Ratio

The standard formula is:

Put-Call Ratio = Number of puts traded ÷ Number of calls traded

The inputs are counts of contracts, not dollar amounts or the number of shares controlled. The usual period is one trading day, though the ratio can be computed weekly, monthly, or as a moving average.

Two inputs are common:

Volume-based PCR uses the number of contracts that changed hands during the period. It reacts quickly and shows what traders did today.
Open-interest PCR uses the number of contracts still outstanding. Open interest builds up over time, so this version moves more slowly and reflects accumulated positioning rather than a single session’s flow. Some traders also track daily changes in put and call open interest.

The order of the terms matters. The put-call ratio puts puts on top. A call/put ratio flips the fraction, so a put-call ratio of 0.50 equals a call-put ratio of 2.0. In a call-put ratio, higher numbers mean more bullish activity. Before reading any figure, confirm which version a source or platform displays.

Where the data comes from: Cboe publishes daily put and call volumes and put/call ratios on its market statistics pages. Other options exchanges and the Options Clearing Corporation also report put and call volume. Many brokerage platforms and data vendors show a put-call ratio for indexes and individual stocks, in real time or on a delay, depending on the service. For a single stock, you can also calculate the ratio yourself. Add up put volume and call volume across all strikes and expirations in the option chain, then divide.

Interpreting the Put-Call Ratio

A ratio of 1.0 means equal numbers of puts and calls traded. It is tempting to treat that as balance, but options markets normally see more call buying than put buying. For that reason, about 0.70 is the widely used average for equity options. That level reflects ordinary hedging with a bullish tilt.

Two basic reading rules follow from that baseline:

A rising ratio, or one above roughly 0.70, means put activity is growing relative to calls. Bearish sentiment is building, whether from speculation on a decline or from hedging against one.
A falling ratio below 0.70 and approaching 0.50 means calls dominate. This is read as bullish positioning.

A ratio above 1.0 means more puts than calls traded. Against a 0.70 norm, that is clearly bearish positioning. For example, a reading of 1.3 indicates traders are defensive and positioned for a downturn. A reading such as 0.61 sits below the average and leans bullish without being extreme.

The level alone gives only part of the picture. Many traders focus on the direction and the deviation. They ask whether the ratio has been rising for several sessions, and whether today’s reading is far from its 10-day or monthly average. If the ratio has held in a tight range and then jumps higher, that change in itself signals a sudden increase in defensive positioning.

Why Is the Put-Call Ratio Important?

The ratio shows how options traders are leaning with real money, summarized in one number. Two trading styles read that number in opposite ways.

Momentum traders use the ratio to confirm a trend. A rising ratio during a decline confirms the bearish move and suggests further downside. A falling ratio during an advance confirms the bullish move. These traders usually pair the ratio with price action, chart patterns, or indicators such as the Relative Strength Index to judge trend strength and choose entry or exit points.

Contrarian traders watch for extremes. Their logic is that once sentiment becomes very one-sided, most participants have already positioned for that direction, which leaves limited fuel to push prices further. Rules of thumb often cited for this approach include:

A very high ratio (above about 1.5 in common rules of thumb, with 1.2 sometimes cited as a warning level) suggests excessive pessimism. The market may be oversold and due for a bounce.
A very low ratio (below about 0.20, or in the 0.20 to 0.30 range) suggests excessive optimism. The market may be overbought and vulnerable to a pullback.

These thresholds are conventions, not fixed rules. What counts as extreme differs by market and has shifted over the years. Contrarians therefore look at the ratio’s historical range for the specific index or stock and focus on outlier readings rather than a universal number.

Longer-term investors use the ratio more loosely. An extreme reading may prompt them to trim a position into widespread optimism or to add during widespread fear, rather than serving as a signal for a short-term trade.

Example of the Put-Call Ratio

Hypothetical example, for illustration only.

Suppose a stock’s options record the following volumes over five sessions:

Day	Puts traded	Calls traded	Put-call ratio
1	6,300	10,000	0.63
2	7,000	10,000	0.70
3	8,400	10,500	0.80
4	11,000	10,000	1.10
5	18,000	12,000	1.50

Each figure is that day’s put volume divided by its call volume. For example, Day 5 is 18,000 ÷ 12,000 = 1.50. The five-day average of the daily ratios is (0.63 + 0.70 + 0.80 + 1.10 + 1.50) ÷ 5 = 0.946.

Each type of trader reads this sequence differently:

A momentum trader sees the ratio climbing every day. If the stock price is also falling, the rise confirms the downtrend, and they may hold or add to short exposure.
A contrarian trader sees Day 5 reach 1.50, more than double the 0.70 baseline. If 1.50 is also an outlier in this stock’s own history, they may treat it as a sign that bearish positioning is overcrowded and look for evidence of a reversal before acting.
A cautious analyst asks why put volume jumped. If an earnings release or an options expiration fell on Day 5, the spike may reflect hedging or position rolling rather than a change of view.

A smaller example shows how sharp single-day readings can be. If traders buy 1,000 puts and 500 calls in a session, the ratio is 1,000 ÷ 500 = 2.0, which is strongly bearish on its face. Whether it is meaningful depends on how unusual 2.0 is for that underlying.

Limitations of the Put-Call Ratio

Volume does not reveal intent. A put can be bought to bet on a decline or to protect a long stock position. A call can be bought outright or sold short. The basic ratio counts contracts traded. It does not tell you whether buyers or sellers started the trades, or whether the trades were hedges or directional bets. A portfolio manager buying index puts as insurance adds to the ratio just as a speculator does.

Contract size and price are ignored. One cheap, far out-of-the-money put counts the same as one expensive at-the-money put, even though their exposures differ a great deal. Option sensitivity to the underlying is measured by the Greeks, and the ratio does not account for it.

Spread trades blur the picture. Multi-leg strategies often buy and sell both puts and calls at once. For example, a straddle buys one call and one put on the same underlying, which is a bet on volatility rather than direction. It still adds to both sides of the ratio.

Time frame changes the reading. Daily ratios are noisy. Weekly or monthly averages are smoother but slower to react. A signal on one time frame may not appear on another.

Volatility can break the usual patterns. In turbulent markets the ratio can swing quickly and produce false signals. The contrarian reading is weaker when normal investor behavior breaks down.

Calendar effects distort it. Trading volume often rises as options approach expiration, and events such as earnings bring bursts of hedging. Both can move the ratio for reasons unrelated to a broad change in sentiment.

Extremes are not stable. Levels considered extreme in one period may be ordinary in another, and they vary across stocks and indexes.

Put-call parity shares the name but is a different idea. Parity is a pricing relationship. For European options with the same strike and expiration, it links the price of a call, the price of a put, the underlying price, and the present value of the strike. It concerns prices and arbitrage, while the put-call ratio concerns trading activity and sentiment.

The VIX measures the market’s expected 30-day volatility of the S&P 500, derived from option prices. The put-call ratio and the VIX often rise together when fear increases, because traders buy protection and option premiums climb. Divergences can tell you something. A rising put-call ratio with a steady VIX may reflect concerns limited to one sector rather than broad fear. At times the ratio moves before the VIX does. The key difference is that the VIX comes from option prices, while the ratio comes from contract counts.

FAQs

What is a very bullish signal on the put-call ratio?

It depends on your approach. For momentum traders, a ratio falling well below 0.70 toward 0.50 confirms bullish positioning. For contrarians, the bullish signal is a very high ratio, above about 1.5 or an outlier for that market's history, which suggests pessimism has peaked and selling may be exhausted. A very low ratio, below about 0.20, is a contrarian warning of overconfidence, not a buy signal.

The Bottom Line

The put-call ratio matters most to options traders and investors who want a quick read on market sentiment. Judge any reading against the 0.70 equity baseline and the ratio's own history for that index or stock, and check for earnings, expirations, or hedging before acting. Treat it as a sentiment gauge to pair with price action and other indicators, since it cannot time trades on its own.