Volume Indicators

Volume indicators measure participation: how much was traded, at which prices, and whether buyers or sellers were pushing. They include raw and relative volume, the accumulating lines such as on-balance volume and cumulative volume delta, oscillators such as the money flow index and Chaikin money flow, and the volume-at-price family of VWAP and volume profile. They are read to confirm a price move or to question one that lacks participation.

What do Volume indicators have in common?

Every indicator in this category starts from the number of shares or contracts traded, which is the one piece of market data that is not a price. Volume says how many participants agreed with a move at the time it happened: a breakout on heavy volume was bought by many, one on light volume by few. The indicators differ in how they attach volume to direction, since the exchange reports a total and the side has to be inferred from where the close sits in the day's range, from whether the trade hit the bid or the ask, or from the price change since the previous bar.

The category divides into four groups. Raw and relative measures (volume, average and relative volume, dollar and relative dollar volume, tick volume, turnover ratio, up, down, buy and sell volume, net volume, volume delta) describe the quantity and its split. Accumulating lines (on-balance volume, the accumulation/distribution line, price-volume trend, cumulative volume delta, the positive and negative volume indexes) keep a running total of signed volume so that its trend can be compared with the price trend for confirmation or divergence.

Oscillators (Chaikin money flow and the Chaikin oscillator, money flow and the money flow index, the Klinger volume oscillator, the volume and percentage volume oscillators, volume rate of change, the Elder force index, ease of movement, the market facilitation index) scale signed volume to a bounded or centered reading. Volume-at-price measures (VWAP, anchored VWAP, VWAP bands and percentage bands, volume profile in fixed and visible range forms, the point of control, value area high and low, high and low volume nodes) show at which prices the volume occurred rather than when.

What they share is that volume confirms rather than leads: a price move with volume behind it is more likely to hold than one without, and a new price high that the accumulating lines do not confirm is the divergence most volume rules are built to catch. They also share a dependence on the sign heuristic, since on-balance volume assigns the whole day's volume to the direction of the close, the accumulation/distribution line splits it by where the close sits in the range, and cumulative volume delta uses the actual trade side, which only tick data provides.

How do you choose a Volume indicator?

• For confirmation of a breakout, read relative volume against the average for that time of day, since raw volume varies by session and by instrument
• For divergence, use an accumulating line that matches the available data: on-balance volume from daily bars, cumulative volume delta when trade-side data is available
• For execution and intraday reference, use VWAP and its bands for the session and anchored VWAP from a chosen event for a longer view
• For support and resistance, read the volume profile's point of control and value area rather than price levels alone, since a high-volume node is where the market agreed on value
• Prefer the money flow index or Chaikin money flow over a volume oscillator when the aim is an overbought or oversold reading, since they weight volume by where price closed in the range

Volume indicators at a glance

Indicator	What it measures	How it is read
Volume	Volume is the number of shares, contracts or units that changed hands during a bar or time window.	Higher volume means more participation and usually easier execution; low volume means thin participation.
Average Volume	Average volume is the mean trading volume over a fixed look-back, such as 20 or 50 bars.	A bar well above average volume signals unusual participation; a bar well below it signals a quiet market.
Net Volume	Net volume signs each bar's volume by the direction of its close: positive when the close is above the prior close, negative when below, zero when unchanged.	Positive net volume means the bar closed higher on that volume; negative means it closed lower.
Chaikin Oscillator	The Chaikin Oscillator is the difference between a 3-period and a 10-period exponential average of the Accumulation/Distribution Line.	Above zero means accumulation is speeding up compared with its recent trend; below zero means it is slowing or distribution is gaining.
Money Flow	Money flow is commonly defined as the typical price of a bar multiplied by its volume, giving the value traded in the bar.	Larger raw money flow means more value traded in the bar.
Ease of Movement	Ease of Movement (Arms) relates the distance the midpoint of the bar moved to the volume needed to move it.	Positive readings mean price moved up with little resistance, negative readings mean it moved down easily, and values near zero mean price needed a lot of volume to move or did not move.
Elder Force Index	Elder's Force Index multiplies the one-bar price change by the bar's volume, combining the direction and extent of a move with the volume behind it.	Positive values mean the bar closed up on volume and negative values mean it closed down, with larger magnitudes meaning stronger moves backed by heavier volume.
Negative Volume Index	The Negative Volume Index (NVI) changes only on bars where volume fell from the prior bar, and then by the percentage price change.	It is typically compared with a long moving average of itself, with NVI above that average read as a more favorable backdrop.
Positive Volume Index	The Positive Volume Index (PVI) changes only on bars where volume rose from the prior bar, and then by the percentage price change.	It is usually read against a long moving average of itself: PVI above its average has historically been read as a favorable backdrop for the crowd's direction.
Price Volume Trend	Price Volume Trend (PVT) is a cumulative indicator that adds or subtracts volume in proportion to the percentage price change each bar.	A rising PVT with rising prices indicates volume is backing the advance, and a falling PVT with falling prices indicates volume is backing the decline.
Percentage Volume Oscillator	The Percentage Volume Oscillator (PVO) is the difference between a 12-period and a 26-period exponential average of volume, expressed as a percentage of the 26-period average.	Positive values show volume running above its slower trend and negative values below it.
Volume Oscillator	The volume oscillator shows the percentage gap between a fast and a slow moving average of volume.	Above zero means recent volume is higher than its longer average, below zero means it is lower.
Volume Rate of Change	Volume rate of change is the percentage change in volume compared with n bars earlier.	Positive values mean current volume exceeds the earlier bar's volume, negative values mean it is lower.
VWAP Bands	VWAP bands plot lines a chosen number of standard deviations above and below the volume-weighted average price.	Price near the outer bands is far from the day's average traded price relative to its typical dispersion, which traders often treat as stretched.
VWAP Percentage Bands	VWAP percentage bands plot lines at a fixed percentage above and below the volume-weighted average price.	The bands mark constant-percentage distances from the session average, which is useful for rules defined in percent terms, such as limits on how far to chase an execution from VWAP.
Klinger Volume Oscillator	The Klinger Volume Oscillator turns each bar's volume into a signed volume force that depends on the trend of (High + Low + Close) and the bar's range, then compares a 34-period and a 55-period EMA of that force.	Above zero indicates volume force has been net positive over the longer trend, and below zero net negative.
Market Facilitation Index	The Market Facilitation Index (Bill Williams) is the bar's price range divided by its volume: how much price moved per unit of volume.	A higher value means price moved a lot for each unit of volume, and a lower value means it needed more volume to travel.
Tick Volume	Tick volume counts the number of price updates (ticks) in a bar rather than the number of units traded.	More ticks in a bar generally go with faster, busier trading, and tick volume tends to rise and fall with real volume in markets where both can be observed.
Up Volume	Up volume is the volume of bars in which the price closed above the prior close.	Up volume that clearly exceeds down volume over the same window shows that more activity came on advancing bars.
Down Volume	Down volume is the volume of bars in which the price closed below the prior close.	Down volume that clearly exceeds up volume shows that more activity occurred on declining bars.
Dollar Volume	Dollar volume is the value traded in a period: price multiplied by the number of shares or contracts.	Higher dollar volume generally means a deeper market for a given position size, so it is often used as a liquidity screen.
Turnover Ratio	The turnover ratio is the share volume traded in a period divided by the shares outstanding, or sometimes the free float.	A higher ratio means the shares are changing hands more actively relative to the company's size, which is generally associated with higher liquidity.
Fixed Range Volume Profile	A fixed range volume profile builds a histogram of traded volume by price level between a start and end time that the user sets, such as one earnings event or one swing.	It shows where volume accumulated during one defined period, so the point of control, value area and nodes apply to that window alone.
Visible Range Volume Profile	A visible range volume profile builds a histogram of traded volume by price level using only the bars currently visible on the chart.	It shows where volume sits within whatever is on screen, so the point of control and value area update as the view changes.
Point of Control	The Point of Control (POC) is the price level with the highest traded volume in a volume profile over a chosen range.	Because the most volume traded at the POC, it is read as the price the market accepted most.
Value Area High	The Value Area High (VAH) is the top price of the value area, the price range around the point of control that contains a conventional 70 percent of the profile's volume.	Prices above the VAH are outside the area where most trading was accepted.
Value Area Low	The Value Area Low (VAL) is the bottom price of the value area, the range around the point of control that contains a conventional 70 percent of the profile's volume.	Prices below the VAL are outside the area where most trading was accepted.
High Volume Node	A high volume node (HVN) is a price level or cluster in a volume profile where traded volume is much higher than at neighboring prices.	HVNs are read as zones of acceptance where price tends to rotate or consolidate.
Low Volume Node	A low volume node (LVN) is a price level or band in a volume profile where traded volume is much lower than at neighboring prices.	LVNs are read as zones of little acceptance, where price moved through fast.
Volume Delta	Volume delta is buy volume minus sell volume for a bar: the net amount of volume that traded at the ask versus the bid.	Positive delta means aggressive buyers outweighed aggressive sellers in the bar; negative means the reverse.
Buy Volume	Buy volume is the portion of traded volume attributed to buyer-initiated trades, where the buyer paid the ask or otherwise took liquidity.	A larger buy volume than sell volume over the same window suggests buyers were more willing to cross the spread.
Sell Volume	Sell volume is the portion of traded volume attributed to seller-initiated trades, where the seller hit the bid or otherwise took liquidity.	Sell volume that exceeds buy volume over a window shows sellers were the more aggressive side.
Relative Dollar Volume	Relative dollar volume compares the value traded in the current period with its own recent average value traded.	Values above 1 mean more value is changing hands than usual; values below 1 mean less.

Each row is the opening sentence of that indicator's own definition and reading, so the table says exactly what the profile says.

What limits do Volume indicators share?

Reported volume depends on the venue and the data feed: U.S. equity volume is consolidated across exchanges but off-exchange trades print with a delay, futures volume is per exchange, crypto volume is self-reported by venues and partly fictitious, and tick volume in spot foreign exchange counts quote changes rather than trades. Every signed-volume line relies on a heuristic to assign direction that is wrong on days when the close misrepresents the session, and the accumulating lines drift with their starting point so their level means nothing and only their trend is read. VWAP resets each session and a volume profile depends on the window chosen for it.

Frequently Asked Questions

What is on-balance volume?

On-balance volume is a running total that adds the day's volume when the close is higher than the previous close and subtracts it when lower. Its level is arbitrary, since it depends on where the total started, so it is read by its trend: rising on-balance volume with rising price confirms the advance, and a new price high that on-balance volume does not match is the divergence it was designed to show.

What is VWAP and how is it used?

VWAP, the volume-weighted average price, is the average price of a session weighted by the volume traded at each price, so it is the price at which the average share changed hands. Institutions use it as an execution benchmark and traders as an intraday reference, with price above VWAP read as buyers in control for the session; anchored VWAP starts the calculation from a chosen date or event instead of the session open.

What does a volume profile show?

A volume profile is a histogram of volume by price level over a chosen window rather than by time. Its peak, the point of control, is the price with the most volume, and the value area is the range around it holding about 70 percent of the volume. High-volume nodes are read as prices the market accepted and low-volume nodes as prices it moved through quickly, which is why they serve as support and resistance.

Why does volume matter for a breakout?

Because a breakout is a claim that the market has repriced, and volume is the count of participants who agreed. A move through a level on volume well above average was bought or sold by many and tends to hold; one on light volume was made by few and is more often retraced. Relative volume, the session's volume against its average for that time, is the usual measure.