Direct Answer
Option volume is the total number of option contracts, calls plus puts, traded in a session for an underlying, expiry or strike. It measures trading activity rather than outstanding positions. Higher volume than usual means more trading interest or hedging activity and generally better liquidity.
Option Volume: Formula, Meaning, Signals, Examples and How to Use It
How Is Option Volume Calculated?
Option volume is the total number of option contracts, calls plus puts, traded in a session for an underlying, expiry or strike. It measures trading activity rather than outstanding positions.
Formula: option volume = call contracts traded + put contracts traded
Inputs:
- Call contracts traded
- Put contracts traded
- Session and expiries included
Worked example. With 24,800 call contracts and 17,200 put contracts traded, total option volume is 42,000 contracts. The inputs are illustrative numbers, not market data.
Reading it. Higher volume than usual means more trading interest or hedging activity and generally better liquidity. It should be compared with the same underlying's typical volume, and with open interest to see whether positions are being opened or just turned over.
Limits. Counts depend on the vendor's feed, which exchanges are consolidated and how multi-leg orders are recorded. Volume counts every trade twice in effect (a buyer and a seller) but is reported once, and it carries no direction.
What is Option Volume?
Option volume is the total number of option contracts, calls plus puts, traded in a session for an underlying, expiry or strike. It measures trading activity rather than outstanding positions.
How to use Option Volume
Higher volume than usual means more trading interest or hedging activity and generally better liquidity. It should be compared with the same underlying's typical volume, and with open interest to see whether positions are being opened or just turned over. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime.
Strengths
- Summing calls and puts into one count gives a single activity gauge for an underlying, an expiry or a strike.
- Each trade is a completed exchange of contracts, so volume is a record of executed activity rather than an estimate from quotes.
- Reproducible when the formula and data convention are fixed.
Weaknesses and limitations
- Contracts of different price and delta count equally, so a thousand cheap far-out contracts weigh the same as a thousand valuable ones.
- A raw count is in contracts, not dollars or shares, so it cannot be compared across underlyings with different prices or contract sizes.
- Correlated indicators can create false confidence by repeating the same underlying information.
Editorial and risk note
This page is educational content, not individualized investment advice. It should not imply guaranteed prediction, accuracy or outperformance.
Frequently Asked Questions
Is Option Volume a buy or sell signal?
No. Higher volume than usual means more trading interest or hedging activity and generally better liquidity. Counts depend on the vendor's feed, which exchanges are consolidated and how multi-leg orders are recorded. A trade built on it still needs a trigger, an invalidation rule, a position size and realistic execution assumptions.
What is the best setting for Option Volume?
Option Volume is computed from call contracts traded; put contracts traded; session and expiries included, so the choices that matter are the data convention and the window it is read over. Test those across instruments, regimes and out-of-sample periods instead of fitting one historical winner.
Can Option Volume be used by itself?
Counts depend on the vendor's feed, which exchanges are consolidated and how multi-leg orders are recorded. Volume counts every trade twice in effect (a buyer and a seller) but is reported once, and it carries no direction. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone.
Does Option Volume work on every timeframe?
The calculation (option volume = call contracts traded + put contracts traded) can be run on any bar size, but behavior is not portable: a reading on a five-minute chart describes a very different market window from the same reading on a daily chart. Validate the exact timeframe before relying on it.
Why does Option Volume give false signals?
Contracts of different price and delta count equally, so a thousand cheap far-out contracts weigh the same as a thousand valuable ones. A raw count is in contracts, not dollars or shares, so it cannot be compared across underlyings with different prices or contract sizes. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated.
How should Option Volume be backtested?
Rebuild Option Volume from call contracts traded using point-in-time data, write the rules before testing, include delisted securities where relevant, model realistic fills and costs, reserve a validation sample and compare with a simpler baseline.