Relative volume in stocks is a ratio that compares a stock's current trading volume with its average volume over a chosen lookback period. The indicator is often abbreviated as RVOL.
A reading of 1.0 means the stock is trading around its comparison average. A reading of 2.0 means it is trading at roughly twice that average.
Relative Volume at a Glance
| Relative volume reading | General meaning |
|---|---|
| 1.0 | Trading around its average volume |
| Above 1.0 | Trading more actively than usual |
| Below 1.0 | Trading less actively than usual |
| 2.0 | Trading at roughly twice its comparison average |
| 0.5 | Trading at roughly half its comparison average |
Relative volume is a ratio, not a share count. A reading of 2.0 does not mean that two shares were traded. It means the stock traded at twice the volume used as its benchmark.
How Is Relative Volume Calculated?
The basic formula is:
Relative volume = Current volume ÷ Average volume
For example:
- Current volume: 2 million shares
- Average volume: 1 million shares
- Relative volume: 2.0
The stock is trading at roughly twice its average volume.
The exact calculation depends on the platform. TradingView's standard Relative Volume indicator compares current volume with a simple moving average of the previous 10 periods and excludes the current volume bar.
Example Using a Daily Chart
Suppose a stock normally trades 800,000 shares per day. If it trades 2.4 million shares today:
2,400,000 ÷ 800,000 = 3.0
Its relative volume is 3.0, so the stock has traded at roughly three times its normal daily volume.
What Does High Relative Volume Mean?
High relative volume means that a stock is attracting more trading activity than usual. Earnings, company news, an analyst upgrade or downgrade, a product launch, a regulatory event, a large price move or a technical breakout can all increase volume.
TradingView lists Relative Volume as a way to find unusual activity in its stock screener.
High relative volume does not tell you that a stock will rise. Every completed trade has both a buyer and a seller, so volume alone does not show the market's next direction.
The price action gives the volume reading more context:
| Price action | What high relative volume may indicate |
|---|---|
| Price rises through resistance | More participation in a possible breakout |
| Price falls below support | More participation in a possible breakdown |
| Price rises but quickly reverses | Heavy activity around a failed breakout or possible distribution |
| Price moves sideways | Increased activity without a clear direction |
TradingView notes that price moves supported by higher volume can carry more weight than moves on low volume. Low-volume breakouts may be more likely to fail.
What Does Low Relative Volume Mean?
Low relative volume means that a stock is trading less actively than its comparison average. A reading of 0.5 means current volume is roughly half of the benchmark volume.
Low relative volume can point to:
- Limited market interest
- Lower liquidity
- A quiet trading session
- A price move with limited participation
- A breakout or trend that lacks confirmation
Low volume does not automatically make a stock unsuitable for trading. It can, however, lead to wider bid-ask spreads and more difficult order execution, especially in small-cap stocks.
Relative Volume Versus Average Volume
These measures answer different questions:
- Average volume: How many shares does the stock usually trade over a chosen period?
- Current volume: How many shares has it traded during the present period?
- Relative volume: How does current volume compare with the average?
For example:
- Average volume: 10 million shares
- Current volume: 20 million shares
- Relative volume: 2.0
Average volume describes the stock's usual activity. Relative volume shows whether its current activity is above or below that level.
Relative Volume Versus Relative Volume at Time
Standard relative volume and relative volume at time use different comparisons.
Standard relative volume may compare the current bar with recent bars. Relative volume at time compares the volume reached at the current time of day with the volume recorded at the same point during previous trading sessions.
The distinction matters because volume changes during a trading session. The opening and closing periods are often busier than the middle of the day. Comparing volume at 10:00 a.m. with a full previous trading day can distort the reading.
A time-of-day comparison provides a closer match between the current session and historical sessions.
How Do Traders Use Relative Volume?
A practical workflow is:
Screen for elevated relative volume. A high reading can help find stocks with unusual activity.
Check the reason for the activity. Look for earnings, company news, economic announcements, analyst research or sector movement.
Compare volume with price action. High volume during a breakout gives a different signal from high volume during a sideways move.
Check liquidity and the bid-ask spread. A stock can have high relative volume and still be difficult to trade if its share price, float or spread creates execution risk.
Wait for the bar to close when appropriate. An unfinished candle has not accumulated its full volume. TradingView warns that the current value can appear lower than the final value while the bar remains open.
Important Limitations of Relative Volume
Relative volume measures unusual activity, but the reading has limits:
- The formula varies by platform. Lookback periods, session settings and calculation methods may differ.
- Extended-hours volume may be handled differently. TradingView's standard Relative Volume calculation does not include premarket or after-hours trading.
- The reading does not show direction. High volume can occur during either buying or selling pressure.
- News can make the historical average less useful. A stock involved in a major event may trade far above its previous range.
- Relative volume does not replace liquidity analysis. A large-cap and small-cap stock may have similar RVOL readings but very different spreads, floats and dollar volume.
Bottom Line
Use relative volume to find unusual activity and then check the price action, catalyst, liquidity and spread. RVOL can show that participation is higher or lower than normal. It cannot, by itself, tell you whether a stock is a buy or a sell.