What Does Volume Mean in Stocks? High, Low and Average Volume on a Chart

Open any stock chart and there's a row of bars under the candles. Most are short, a few tower over the rest, and they're green and red like the candles above them. That row is volume. It's the first thing I look at after the trend, and it's easy to misread. Two of the explainers that rank for this question say a red bar means selling, which isn't what the color means. So this is the plain version. What the number counts, where it comes from, what high, low and average volume tell you, and what they can't.

Quick Answer: What Does Volume Mean in Stocks?

Everything here is as of October 20, 2026. The definition is Investopedia's, the reporting mechanics come from FINRA's rules and filings and the two consolidated tape plans' own pages, and the chart settings come from TradingView's help center. I read eleven of the pages that rank for this question first. Two read green bars as buying, several infer institutions from tall bars (a chart can't show who traded), and none gives a sourced number for "good" volume. Where a page disagrees with the primary source, the source wins. If a term is new, the trading terms glossary has a short definition.

What Is Volume in Stocks, Exactly?

Investopedia's definition of trading volume is "the total number of shares or contracts traded for a security or market within a specified timeframe." On a stock that's shares. On a futures chart it's contracts, and on a crypto chart it's coins, or the quote currency, depending on how the pair is reported. Same idea in every case: how much changed hands.

Each trade adds its shares once. Investopedia's example: 5 trades of 100 shares each make a volume of 500 for the day. The buyer and the seller of those 100shares don't count twice, because they're two sides of one trade. That's why "more buyers than sellers" is something volume can never show. Every share sold was also bought.

The period is whatever one bar covers. On a 1-minute chart each bar is a minute of trading, and on a daily chart it's the session. Add up a day's 1-minute bars and you get roughly the daily figure, with one catch, extended hours, that comes up below. If the candles above the bars are new to you too, the guide to reading a stock chart starts there.

Where does a stock's volume number come from?

In the US it's a consolidated number, meaning every venue's trades in one total. Exchanges send their trades to a central processor, the SIP. The Consolidated Tape Association's page says the SIP links the markets by "processing and consolidating all protected bid/ask quotes and trades from every trading venue into a single, easily consumed data feed." NYSE-listed and other exchange-listed stocks run on the CTA's tapes, and Nasdaq-listed stocks on the UTP Plan's Tape C, which that plan calls "the single source of consolidated market data for Nasdaq-listed securities." The UTP Plan's site also says the two plans are moving to a single new CT Plan effective April 1, 2027.

Trades that happen away from the exchanges count too. FINRA Rule 6110 requires member firms to report trades in exchange-listed (NMS) stocks "effected otherwise than on or through a national securities exchange" to FINRA, which runs trade reporting facilities for exactly that, and the reporting rules give firms no more than 10 seconds after execution during normal market hours. FINRA's 2025 filing on its trade reporting facilities says all of those reports, apart from non-tape reports used for regulatory and clearing purposes, "are reported to and publicly disseminated by the appropriate Securities Information Processor." So the daily number on a quote page is meant to cover every exchange plus the off-exchange trades. I'm not giving a share for how much of it trades off-exchange. It moves, and I didn't find a dated primary figure to put here.

What Do Green and Red Volume Bars Mean?

They tell you which way price went on that candle. They don't tell you who won. A red bar with 2 million shares on it is 2 million shares bought and 2 million shares sold, at prices that ended lower. Calling it "selling volume" is a shorthand that falls apart the moment you remember every trade has two sides.

The color rule also isn't universal. TradingView's candlestick help describes two rules for price bars: by default a bar's own open and close set its color, and a "Color bars based on previous close" setting switches to comparing each close with the previous bar's close. Volume panels follow price the same way, and which comparison they use depends on the platform. One broker's charting help page says its volume bar is green "when the current candle's closing price is greater than the previous candle's closing price." That's how you get a green candle sitting on a red volume bar: it closed above its own open but below the candle before it. I couldn't find the volume default written down on the platform help pages I checked, so open your volume settings and look.

So read the height first. Height is how many shares traded. The color repeats the candle's direction, which you can already see one panel up.

What Do High, Low and Average Volume Mean?

High and low only mean something next to a baseline, and the baseline is the stock's own average. Two million shares is a dead day for some stocks and a record for others, so comparing raw volume across tickers tells you almost nothing.

Average volume is a lookback average of daily volume, and the window is the provider's choice. TradingView's help page on how it calculates average volume describes a simple average over a set number of days, with versions for 10, 30, 60 and 90 days, and says the figure "is not calculated during Extended hours, only during regular trading sessions" (as of October 20, 2026). Another site can use another window, so two "average volume" numbers for the same stock can both be right. Relative volume turns "busier than usual" into one number, and the RVOL guidecovers how it's calculated and why the lookback and the time of day move it, so the formula stays there.

Every row describes participation. None of them tells you direction, and none is a buy or sell signal on its own. Volume earns its keep when you read it with the candle above it.

What is good volume for day trading?

There isn't a universal number. Investopedia's own answer is that traders "define good trading volume differently," and none of the pages I read backs a share-count cutoff with a primary source, so this post doesn't print one. Good volume buys you one practical thing: enough trading that you get in and out near the price on your screen. Check it against a few things.

• Its normal
  Today's volume so far against what this stock usually does by this time of day. A raw share count means nothing until you know the stock's normal.
• The spread
  A stock can trade plenty of shares on a wide spread, and you pay the spread on every round trip. The bid-ask spread explainer shows how to read it.
• Your size
  If your order is a big slice of what trades in a typical 1-minute bar, you're the one moving the price. The guide to slippage on fast and thin stocks covers what that costs.
• The float
  Low-float names can print huge volume against a small number of tradable shares, and the stock float guide covers why they move the way they do.
• Penny stocks
  Thin bars and wide spreads together are the normal state of a lot of sub-$5 names, which is most of what the penny stock guide is about.

When is volume heaviest during the day?

Near the open and the close. Investopedia puts it plainly: "Volume is typically higher at market open and close," and it "tends to be lower at lunchtime and before a holiday." On a 5-minute chart the first bars of the session usually dwarf the midday ones, so compare a bar with bars from the same part of the day, not with 12:30. The best time of day to trade stocks post walks through that shape window by window.

Outside the regular session it gets thin. A premarket bar on a stock with no news can be a handful of trades, and the premarket trading guide and the after-hours guide cover why a move on those bars carries less weight than the same move at 10 a.m.

Is Volume the Same on Every Chart?

No, which is why two sites can print different volume for the same stock on the same day. For stocks, the data set itself can differ. TradingView's help center notes that "intraday and daily data sets often include different trades, resulting in different prices." Then there's the instrument, because a volume bar doesn't count the same thing everywhere.

• US stocks
  Consolidated shares across exchanges plus FINRA-reported off-exchange trades, as above. Whether extended hours are in the bar is a chart setting (next section).
• Futures
  Contracts traded in that contract on its exchange. TradingView's Volume help says "For futures, volume is based more on the number of contracts." That's a different number from open interest, and the open interest vs volume guide explains why the two can move in opposite directions.
• Crypto
  Usually one exchange's pair, so the bars count that venue's trades, not the whole market. The FAQ below covers the 24-hour figure on price pages.
• Spot forex
  Usually tick volume, a count of price changes rather than traded amount, and some feeds show none at all, as the currency futures vs spot forex comparison covers.
• Cash index
  Often nothing. SPX is calculated from its stocks, not traded, and TradingView's help says "most indexes also show n/a when the volume indicators are applied." The SPX vs SPY guide covers which chart has real volume.

Does stock volume include premarket?

Sometimes. The trades are on the record. FINRA's reporting rule for one of its trade reporting facilities (Rule 6380A, the version in force on October 20, 2026) covers trades executed between 4:00 and 9:30 a.m. and between 4:00 and 8:00 p.m. ET, plus overnight and weekend trades, and makes firms flag all of them with a modifier "to denote their execution outside normal market hours." FINRA's July 2025 filing put the consolidated feeds' hours at 4 a.m. to 8 p.m. on business days.

Whether your chart counts those trades is a setting. On TradingView, extended hours is an option for intraday charts (the ETH button, or the Symbol tab in Settings), and its help center says extended-hours data, "if provided, is usually not included in the daily candle." Its average-volume figure is regular-session only too. So a daily bar and the sum of the day's 1-minute bars with extended hours switched on can disagree, and both are doing what they're set to do. Other platforms make their own choices. Check yours before you compare a premarket bar with a daily average.

What Do Breakout, Pullback and Climax Volume Bars Look Like?

You spot each of them by comparing heights, bar against bar, not by memorizing share counts. They come up all the time on momentum charts.

• Breakout
  When price clears a range, the bar under the breakout candle should stand out from the bars in the base. A break on bars no bigger than the base had less participation behind it. The breakout vs break-and-retest guidecovers what to do when you can't tell.
• Dry-up
  In a with-trend pullback or a flag, the bars often shrink. A bull flag drifting down on lighter bars than the pole is the textbook look. The bull flag pattern guide walks through it, and the bull flag setup page shows how a grade reads one.
• Climax
  The biggest bar on the chart after a long, steep run, often on a wide candle with a long upper wick, can mark the end of the run rather than the start of a new leg. The post on chasing overextended chartscovers why that's the expensive bar to buy.
• Even bars
  No read at all. Volume that looks the same everywhere doesn't confirm or deny anything.

None of these is a rule. Breakouts on huge bars fail, and quiet moves keep going longer than you'd think. Volume describes how many shares took part, and that's all. The full confirmation checklist, and how an AI read handles each case, lives in the AI volume analysis guide, so I'm not repeating it here.

Volume vs RVOL, OBV, VWAP, volume profile and open interest

Each tool built on volume answers a different question from the raw bars. One line each, and each links to the post that owns it.

If you only keep one, keep the raw bars. Every other row in that table except open interest is built from them.

What Does an AI Chart Grade Read From the Volume Panel?

I build SnapPChart, so here's what the grader does with a volume panel, straight from the code. It grades one uploaded screenshot and has no live data. The model reads the image, and the later stages work from what it read. It grades the setup as a with-trend continuation, a pullback in an uptrend for a long or a rally inside a downtrend for a short, the same idea as a momentum trading strategy. Reversals aren't setups to it.

It reads volume the way this post does, by comparing bar heights. Its instructions ask it to describe the pattern across green and red candles and to put any spike as a rough multiple of the average bar (its own example reads "~3x average"), and they reject bare labels like "high volume" or "weak volume." Its flag rules expect the pullback to come on lower volume than the pole, for a bull flag on a long and a bear flag on a short. The screenshot goes in at high detail, because at low detail the volume panel at the bottom of the chart shrinks to a fuzzy strip.

If the panel is cropped off, missing or too small to compare, it records that as missing data, not weak volume, and the later stages are told not to hold it against the setup. It can't know the day's share total, the average-volume figure, relative volume, the float or how much traded off-exchange. None of that is in the bars, so it doesn't have them unless they're printed on the screenshot, and even then its instructions are about comparing bars. It doesn't know whether your platform put extended-hours trades into a bar, and it can't tell from the picture whether a bar counts consolidated shares, one exchange's coins or forex ticks.

The instrument sets the ceiling. Stock charts can grade up to A+. Forex, crypto, futures, index and metals charts top out at B, because the scoring was built on stock momentum trading and we cap the other classes until each gets its own rules. Where the grader's symbol check recognises the label on your chart, such as a forex pair, a crypto token, a metal, an index name or a futures code, that decides the class. Most stock tickers aren't on those lists, and for those, for a label it doesn't recognise or for a chart with no label, the class comes from the model's own read of the chart. A few real stock tickers share their letters with a coin or a futures code (DASH reads as crypto, CL and ES as futures), and those charts get the B cap too. The AI stock chart analyzer page shows what a grade on a stock chart looks like.

1. Keep the volume panel in the screenshot. Cropped bars are missing data, so the grade gets no volume read at all.
2. Show the base. Zoom out far enough that the breakout bar has something to be compared with.
3. Check the numbers yourself.Today's volume against its average, the spread and the float aren't in the bars.
4. Skip the C grades. A C-grade trade that stops out costs the same as an A-grade trade that stops out. Passing on it keeps the risk for a setup you actually wanted.

There's more on AI chart analysis from a single screenshot, and the AI trading guide's section on what AI can't see applies here in full.