What do volume bars mean?
Each volume bar shows how many shares changed hands during that candle: one bar per day on a daily chart, one per five minutes on a 5-minute chart. Every share traded has a buyer and a seller, so a tall bar means a lot of shares changed hands, not that buyers won. The colour usually just matches the candle, green when it closed up and red when it closed down (some platforms compare with the previous close instead), so a red bar is not selling volume.
Volume only makes sense in comparison, and the fair comparison is the stock with itself. Two million shares is a quiet day for some large caps and a frenzy for a small company. That is why most traders add a moving average of volume, often over 20 or 50 bars, like the dashed line in the drawing at the top, and read each bar as above or below normal.
Volume on a breakout: confirmed or weak?
A breakout above resistance needs new buyers at higher prices, and volume is the most direct evidence that they showed up. Hypothetical, as in the drawing below: a stock ranges between $30 and $32 on about 2 million shares a day. It closes at $32.60 on 5 million shares, 2.5 times its average, and holds above the old ceiling. On another chart the same kind of close comes on 1.4 million shares, 0.7 times the average, and the next candles fall back inside the range.
Heavy volume improves the odds that a breakout is real; it does not make it safe. High-volume breakouts fail too, so a stop on the other side of the level is still part of the plan. The breakout trading strategy guide covers the rest of the checklist.
Volume on pullbacks: why drying up is healthy
In a healthy uptrend, volume tends to rise on the up legs and shrink on the pullbacks, as in the drawing below. Light volume on a dip says that few holders are rushing to sell: the trend is pausing, not reversing. Many traders wait for that quiet dip to end with a candle closing back up on rising volume; the pullback trading strategy shows the entries.
The warning sign is the opposite: a pullback on heavy, expanding volume, especially through a support level. That points to real selling, and it is often how a trend starts to break. The same logic works upside down in a downtrend: weak bounces on light volume, heavy volume on the drops.
Climax volume: when a spike can mark the end of a move
After a long, steady run, the biggest volume bar of the whole move sometimes appears right at the top: a wide candle that leaves a long upper wick, as late buyers rush in and earlier buyers sell to them. That is a buying climax. A selling climax is the mirror image at a bottom: a panic flush on huge volume after a long fall. The Wyckoff method gives these events names.
A spike alone is not a signal, because huge volume also appears at the start of new moves. What makes a climax readable is what price does next: in the drawing below, the next swing fails to make a new high, and only then does the spike look like exhaustion. Wait for a close back below a level or a lower high before acting, and keep the stop where the idea is wrong.
Average volume, relative volume and volume at price
A few related tools answer different questions:
- Average volume: the mean over a lookback, such as 20 or 50 days. It tells you what normal is, and how liquid the stock is: thinly traded stocks usually have wider bid-ask spreads.
- Relative volume (RVOL): current volume divided by average volume for the same period, so 2 means twice normal. During the session, compare with the same time of day; the relative volume lesson explains why.
- Volume at price: volume profile shows how much traded at each price rather than in each bar, which reveals the levels where the most business was done.
- On-balance volume: OBV is a running total that adds the day’s volume on up closes and subtracts it on down closes, to show whether volume flows with the trend.
Pre-market volume and other volume traps
Pre-market and after-hours volume is a small fraction of a regular session, so a few large orders can make an extended-hours bar look huge. Compare it with the stock’s usual pre-market volume, never with a full-session average, as the pre-market trading guide explains. Whether your intraday chart shows those hours at all depends on the extended-hours setting covered in the best TradingView settings. Other traps:
- The unfinished bar: the current bar reads low until it closes, because its volume is still coming in.
- Scheduled spikes: earnings days, index rebalances and options expiration days can inflate volume without saying much about the trend.
- Short sessions: a holiday half-day looks weak against a full-day average.
- Volume is not direction: a stock can fall all day on heavy volume, and the same reading confirms a breakdown as well as a breakout.