Use matching counts
Divide put volume by call volume for the same universe and time interval. Separately, divide put open interest by call open interest for the same universe and observation date. Keep equity, index and total-market series distinct; their contract mix and use can differ.
A reproducible example
500,000 put contracts divided by 700,000 call contracts gives 0.7142857, displayed as 0.714. It means about 0.714 puts traded for each call in that sample. The separate example of 2,000,000 put open contracts divided by 2,500,000 call open contracts gives 0.800.
Counts do not identify the trader’s position
A trade has a buyer and a seller. Aggregate volume does not identify who initiated it, whether it opened or closed exposure, or whether it was one leg of a spread. Open interest counts outstanding contracts rather than unique traders or directional conviction. The Options Industry Council explains that open interest alone is neither bullish nor bearish.
Interpret the series, not a universal threshold
Above one means more puts than calls; below one means fewer. It does not establish fear, greed, an oversold market or a profitable reversal. If testing a historical hypothesis, use the same data series and timestamp rules, avoid looking ahead, and evaluate outcomes after costs. This calculator supplies no historical backtest or timing signal.
Volume and open interest remain separate
Volume measures trading activity over an interval. Open interest is a stock of outstanding contracts after clearing. Their arithmetic average has no automatic financial interpretation, so the page does not produce a combined score.
Frequently asked questions
Does a high put/call ratio prove bearish sentiment?
No. The ratio counts contracts, not buyer intent or net exposure. Puts can hedge an existing portfolio, calls can be sold, and multi-leg trades contribute to both sides.
What is a good or neutral ratio?
There is no universal cutoff. Compare the same product universe, time window and data source with its own history. A ratio of one only means equal put and call counts.
Why is a zero call count not shown as zero PCR?
Division by zero is undefined. If calls are zero, the ratio is unavailable even when puts are also zero. An explicit zero put count with positive calls produces a valid zero ratio.
Can volume and open interest ratios be combined?
They measure different things: activity during an interval and outstanding contracts at a point in time. This calculator keeps them separate and does not label their average a sentiment score.
Does this page fetch current market data?
No. All counts are manually entered. Default values are examples. Use a consistent provider, universe and observation period, and check the source timestamp.
Educational calculations, not investment advice.