Rel Volume
Relative Volume
💡 What is Rel Volume (Relative Volume)? - Today's Interest Compared to Normal
Rel Volume is short for Relative Volume. It is an indicator that shows how many times the current (or today's) trading volume is compared to the usual average volume. To put it simply, imagine a store that normally gets 100 customers a day. If today 300 customers show up, the Rel Volume is 3.0 (3 times). This means 3 times more people than usual are interested and visiting this store today.
English-Korean Keyword Glossary
Relative Volume (Relative Trading Volume) | Average Volume (Average Trading Volume) | Volume Spike (Sudden Volume Surge) | Unusual Volume (Abnormal Trading Volume) | Accumulation (Buying Up) | Distribution (Selling Off) | Liquidity (Liquidity) | Volume Confirmation (Volume Confirmation) | Breakout Volume (Breakout Volume)
Rel Volume is usually shown as a decimal number. 1.0 means the same as average, 2.0 means twice the average, and 0.5 means half the average. The Rel Volume shown on Finviz compares the volume up to the current time during the trading day to the average for the same time period, and after the market closes, it compares the full daily volume to the daily average volume.
Volume plays a "confirmation" role in the stock market. If the price goes up but volume does not follow, the move is not very trustworthy. But if the price moves with a big increase in volume, the move is considered more meaningful. Rel Volume shows how "abnormal" the volume is in a number, so it is a tool that lets you quickly spot when something important is happening in the market.
🔍 Why Should You Look at Relative Volume?
Spotting Unusual Signals
If trading volume suddenly jumps 2–3 times higher than usual, there is a high chance that something special has happened to the stock, such as important news, earnings announcements, insider trading, or institutional buying/selling. You can see Rel Volume spike to 3–5 times when NVIDIA (NVDA) announces a big AI-related contract, or when Tesla (TSLA) reports earnings.
Checking the Reliability of a Breakout
When a stock price breaks through a resistance line, a high Rel Volume means it is more likely to be a "real breakout," and a low Rel Volume means it is more likely to be a "fake breakout." In general, if Rel Volume is 1.5 times or higher during a breakout, it is trustworthy, and if it is 2 times or higher, it is considered a very strong breakout.
Detecting Institutional Accumulation/Distribution
When institutional investors buy in large amounts (Accumulation), trading volume increases. If the stock price rises slightly while Rel Volume is high, institutional accumulation may be in progress. On the other hand, if the stock price falls while Rel Volume is high, institutions may be selling off (Distributing) their holdings.
🔎 How to Check
Checking on Finviz
You can directly check the "Rel Volume" item on Finviz's stock detail page. You can also use the Rel Volume filter in the Finviz Screener to search for stocks with sudden volume spikes. If you filter by "Rel Volume over 2," you can see at a glance which stocks are trading more than 2 times their normal volume today.
Checking on Charts
On TradingView, looking at the volume chart lets you visually spot sudden volume spikes. If you add an average volume line, you can immediately see which days the volume far exceeded the average. Most brokerage HTS/MTS platforms also provide a volume chart by default.
Setting Scanners/Alerts
You can set Rel Volume-based alerts on Finviz, TradingView, TC2000, and similar platforms. If you set an alert for when the Rel Volume of a stock you are watching exceeds 2 times, you won't miss important moves. This feature is especially useful for short-term traders.
💡 How to Use It
Judging the Reliability of Price Movements
If a stock price rises 2% but Rel Volume is 0.5 (half of normal), this rise does not mean much. That is because few participants are involved in the move. On the other hand, if the same 2% rise happens with Rel Volume of 3.0, it is a meaningful rise that 3 times more investors than usual have participated in. Remember the saying: "Price shows the direction, and volume shows the degree of conviction."
Finding Stocks with Unusual Volume
If you scan stocks with high Rel Volume every day, you can find stocks where "something is happening" in the market. On Finviz, filtering by "Rel Volume over 2 + Change over +3%" finds stocks that are rising along with a volume spike, and "Rel Volume over 2 + Change under -3%" finds stocks that are crashing.
Checking Normal Conditions
If Rel Volume stays at 0.5 or below for a long time, it means market interest in that stock is shrinking. Once liquidity drops, it can be hard to trade at the price you want when buying or selling, so you need to be careful. This is especially true for small-cap stocks, where a sharp drop in Rel Volume can make trading itself very difficult.
🔗 Related Indicators
Average Volume
This is the average daily trading volume over a set period (usually 20 or 50 days). It is the benchmark value for Rel Volume. The higher the average volume, the more liquid the stock, making large trades easier. Stocks with an average daily volume of 500,000 shares or less may carry liquidity risk.
OBV (On-Balance Volume)
This is an indicator that adds up trading volume on up days and subtracts volume on down days. If OBV rises, buying pressure is strong; if it falls, selling pressure is strong. If the price moves sideways while OBV rises, it can be a leading signal that a price increase is coming soon.
Volume Price Trend (VPT)
This is an indicator that combines the rate of price change with volume, and is an evolved form of OBV. By weighting volume by the size of price changes, it allows for more precise supply-and-demand analysis. It is available for free on TradingView.
⚠️ Cautions
1. High Rel Volume does NOT always mean the price goes up: A volume spike can be caused not just by stronger buying, but also by stronger selling. If Rel Volume is high and the price is falling, it means large-scale selling is underway, which is a danger signal.
2. Time-of-day bias in intraday Rel Volume: Trading is concentrated at the start of the session, so Rel Volume can appear high early in the day. The final Rel Volume after the market closes is more accurate. Use intraday Rel Volume only as a reference.
3. Options expiration day effect: On monthly/quarterly options expiration days, the volume of related stocks naturally increases. The high Rel Volume on these days should be interpreted in a different context than a normal day.
4. Volatility of small-cap stocks: Small-cap stocks normally have low volume, so even a moderate amount of large trading can push Rel Volume to extreme levels (10x or more). Rel Volume for small-caps can be less reliable than for large-caps.
5. Check the absolute volume too: Even if Rel Volume is 3.0, if the average volume is only 10,000 shares, the actual volume of 30,000 shares is still very illiquid. Check the absolute volume (Average Volume) along with Rel Volume.
✅ Checklist
☑ Have you checked the current Rel Volume figure?
☑ Have you identified the cause of the volume increase (news, earnings, event)?
☑ Have you checked whether the direction of price change and volume change match?
☑ Have you checked whether the average volume (absolute value) is sufficient?
☑ Have you checked the Rel Volume trend over the past few days?
☑ Have you checked for options expiration day or special event effects?
☑ Have you interpreted it together with technical indicators (moving averages, RSI, etc.)?
☑ Have you checked that Rel Volume is 1.5x or higher during a breakout/breakdown?
❓ Frequently Asked Questions (FAQ)
Q. At what multiple of Rel Volume should I be cautious?
A. In general, a Rel Volume of 2.0 or higher can be considered as "something different from usual is happening." 3.0 or higher is very unusual, and 5.0 or higher is an extreme situation (earnings surprise, major news, M&A, etc.). However, the benchmark varies by industry and stock. For popular stocks like Tesla (TSLA), trading volume is high on a normal basis, so a Rel Volume of 2.0 may not mean much. But for stable stocks like Coca-Cola (KO), a Rel Volume of 2.0 is very unusual.
Q. Should I avoid stocks with low trading volume?
A. Stocks with very low average daily volume (100,000 shares or less) carry liquidity risk. You may end up buying at a higher price or selling at a lower price than you wanted, and there may be no buyers when you urgently want to sell. This is especially risky for Korean investors who find it hard to respond in real time when the U.S. market opens at night. Beginners are advised to focus mainly on stocks with an average daily volume of 1 million shares or more.
Q. Do long-term investors also need to check Rel Volume?
A. Long-term investors don't need to check Rel Volume every day, but it is useful in certain situations. If trading volume suddenly spikes in a stock you own, check the news. If it's good news, you can keep holding. If it's bad news, you may need to respond. Also, when you want to buy a stock, buying on a day with low Rel Volume lets you buy at a better price. When selling, selling on a day with high Rel Volume makes it easier to sell at the price you want.
Q. What does it mean when the price goes up but volume goes down?
A. This is a form of "Bearish Divergence," a warning sign that the upward momentum is weakening. If the price makes a new high but the volume (Rel Volume) is lower than at the previous high, it means fewer and fewer investors are participating in the rise. A correction or a shift to a downtrend becomes more likely afterward. Conversely, if the price falls while volume decreases, it means selling pressure is being exhausted and a bottom may be near.
🇰🇷 Notes for Korean Investors
U.S. market trading hours: Regular U.S. trading hours last 6.5 hours (9:30–16:00 ET), and the total is longer if you include pre-market and after-market sessions. Since the market opens at night in Korean time, real-time Rel Volume monitoring can be difficult. A realistic strategy is to check the previous day's Rel Volume after the market closes (Korean morning) and respond accordingly.
Using the Finviz Screener: Using the "Relative Volume" filter on Finviz makes it easy to find stocks with sudden volume spikes. Every morning, searching with "Rel Volume over 3 + Change over +5%" lets you identify stocks that had big moves the previous day so you can research them further.
Real-time monitoring: You can check real-time volume information for free on Yahoo Finance, CNBC, MarketWatch, and similar sites. Domestic broker MTS apps also let you see the trading volume of overseas stocks in real time, but in many cases they do not directly calculate and show Rel Volume.
Trading strategy: When Korean investors participate in the U.S. market at night, if the Rel Volume of a stock they hold suddenly spikes, check the news right away. If it is positive news, hold. If it is negative news, a quick response may be needed.