What is the Volume Rate of Change formula?

VROC = 100 × (current volume − volume N bars ago) / volume N bars ago. It compares two bar values, not current volume with an average. With reference volume 1,000 and current volume 1,500, VROC is +50%.

Does positive Volume ROC mean buying pressure?

Positive VROC means more volume than N bars ago. Volume alone has no price direction, so the same +50% reading can occur on a rising or falling price bar. A separate price condition is needed even for a directional filter.

Why is the Volume Rate of Change indicator blank?

The example returns na if current volume is missing or invalid, the reference bar is unavailable, or reference volume is zero or negative. It also hides the unfinished bar by default. Read the status box and check the feed before changing the lookback.

Can Volume ROC fall below -100%?

With nonnegative current volume and a positive reference, -100% is the lower bound and occurs when current volume is zero. There is no fixed upper bound. A reference of zero makes percentage change undefined, including when both values are zero.

What are the best Volume ROC settings?

There is no universal best lookback or threshold. This example uses 12 bars and a 50% filter threshold as editable demonstration inputs. A longer lookback changes the reference bar; it does not average or smooth volume. Keep symbol, feed, session and timeframe fixed while evaluating a setting.

Is Volume ROC the same as relative volume?

No. VROC is a percentage change from one earlier bar. Relative volume usually divides current volume by an average, while Relative Volume at Time uses comparable historical time offsets. A value of 1.5 times an average is a different comparison from +50% versus one bar.

Does this Pine Script repaint?

The formula uses current and past chart bars, with no future data request. Current volume accumulates during an open bar, so a live reading changes. This example hides it by default and confirms its filter at bar close. Feed corrections or changes to chart data and settings can still alter historical results.

TradingView indicator guides

Volume Rate of Change: formula and signal limits

Volume Rate of Change (VROC) measures the percentage change between current volume and volume N bars earlier. A reading of +50% means current volume is 1.5 times that reference bar. It says how trading activity changed; it does not tell you whether buyers or sellers drove the price.

VROC = 100 × (V − V[N]) / V[N]

V[N] is one historical bar, not the average of the preceding N bars. The percentage is defined only when the reference volume is positive and both endpoints are available.

Copy the guarded Pine Script example

Calculate VROC and check the denominator

For a 2-bar lookback and volumes [1,000, 2,000, 1,500], the third bar compares 1,500 with 1,000. Its VROC is +50%, despite volume falling from the immediately preceding 2,000. Dividing by the prior two-bar average of 1,500 would answer a different question.

Hypothetical observations in the same feed units; each row is an independent case.
Case	Reference V[N]	Current V	VROC	Meaning
Higher volume	1,000	1,500	+50%	1.5 times the reference
Lower volume	1,000	500	-50%	Half the reference
Unchanged	1,000	1,000	0%	Equal to the reference
Zero now	1,000	0	-100%	Valid arithmetic if zero is a real observation
Small reference	10	1,000	+9,900%	Large percentage from a small denominator
Zero reference	0	1,000	Undefined	Return na; do not divide by zero
Missing endpoint	n/a	1,000	Unavailable	Return na; do not replace missing data with zero

The -100% lower bound follows directly from nonnegative volume and a positive denominator. Tiny reference values can produce large positive percentages without large absolute activity. Verify that a reported zero is meaningful before treating it as a complete absence of trading.

Choose a comparable volume baseline

Units and exchange coverage

TradingView reports the volume supplied for the selected symbol. Units vary: stocks commonly use shares, futures use contracts, and crypto feeds can use base or quote currency. Some feeds supply tick volume, which counts price updates; others have no volume. Check the symbol and feed description before interpreting the result.

The percentage cancels a constant unit scale: converting both endpoints from shares to thousands of shares leaves VROC unchanged. It does not make different exchanges or spot and perpetual markets equivalent. Converting base volume into quote value at each bar introduces price changes into the comparison. The script reads only the current chart feed and does not aggregate exchanges.

Sessions and time of day

A fixed N-bar lookback can compare an opening-session bar with a quieter time of day. In a hypothetical example, opening volume of 900 versus a reference of 300 gives +200%. If the average of comparable opening bars is 1,000, relative volume at that time is only 0.9 times its baseline. Both calculations are correct, but their baselines answer different questions.

Use the same symbol, timeframe and session setting when comparing results. N counts available chart bars, so holidays, shortened sessions and missing bars can break an assumed same-clock-time match. For a time-of-day question, use a session-aware comparison such as TradingView Relative Volume at Time. The VROC example below performs no session adjustment.

Closed bars and alert timing

Volume accumulates while a bar is open. Comparing that partial count with a complete historical bar can make live VROC look unusually low. The example waits for the chart bar to close by default. This controls intrabar changes; it cannot prevent data-provider revisions.

Volume ROC vs price ROC, RVOL and Volume Oscillator

Measure	Comparison	What the output describes
Volume ROC	Current volume vs one earlier volume bar	Percentage change in activity
Price ROC	Current price vs price N bars earlier	Percentage price change
Relative volume (RVOL)	Current volume / a defined historical average	A ratio such as 1.5 times average
Volume Oscillator	Fast volume average vs slow volume average	Average-volume difference, raw or normalized

For example, price can fall from 100 to 95 while volume rises from 1,000 to 1,500 over the same window. Price ROC is -5%; VROC is +50%. The positive volume reading does not turn that price decline into a bullish signal.

Pine Script v6 with missing-volume and zero-base guards

Paste this indicator into TradingView Pine Editor and add it to a chart. The Data Window exposes both volume endpoints. The status box explains unavailable output, and gaps remain gaps instead of being filled with zero.

Pine Script v6

//@version=6
indicator("Volume Rate of Change: checked baseline", overlay=false, precision=2)

length = input.int(12, "Lookback in bars", minval=1, maxval=500)
threshold = input.float(50.0, "Volume increase threshold (%)", minval=0.0)
confirmedOnly = input.bool(true, "Plot only closed bars")

baseVolume = volume[length]
validVolume = not na(volume) and volume >= 0
validBase = not na(baseVolume) and baseVolume > 0
vroc = validVolume and validBase ? 100.0 * (volume - baseVolume) / baseVolume : na
showBar = not confirmedOnly or barstate.isconfirmed

plot(showBar ? vroc : na, "VROC (%)", color=color.blue, linewidth=2, style=plot.style_linebr)
hline(0, "Unchanged volume", color=color.gray)
plot(volume, "Current volume (feed units)", display=display.data_window)
plot(baseVolume, "Reference volume (feed units)", display=display.data_window)

// A demonstration filter, not an entry or exit system.
priceUp = not na(close[1]) and close > close[1]
filterPassed = barstate.isconfirmed and not na(vroc) and vroc >= threshold and priceUp
plotshape(filterPassed, "Closed-bar filter passed", shape.circle, location.bottom, color.orange, size=size.tiny)
alertcondition(filterPassed, "Volume and price filter", "Closed bar: VROC met the threshold and close exceeded the previous close.")

var table status = table.new(position.top_right, 1, 1)
if barstate.islast
    string message = not validVolume ? "Current volume missing or invalid" : na(baseVolume) ? "Reference volume unavailable" : not validBase ? "Reference volume must be positive" : not showBar ? "Waiting for bar close" : "VROC unit: percent"
    table.cell(status, 0, 0, message, text_color=color.white, bgcolor=color.new(color.black, 20))

Set the lookback to 2 and inspect any closed bar. Read current and reference volume from the Data Window, then calculate the percentage independently.
Use 12 only if a 12-bar comparison fits your question. It means 12 chart bars, not a weekly average. Increasing N does not smooth the line.
The orange marker requires a closed bar, valid VROC at or above the threshold, and close above the previous close. The default 50% threshold is illustrative, with no tested trading advantage.
Create an alert from the named filter condition and choose once per bar close. It can qualify on consecutive bars; the code does not require a new threshold crossing.

Educational indicator only. The filter has no order execution, exits, position sizing or trading-cost model. A volume increase does not guarantee a breakout or return. Evaluate any trading rules separately; this page is not investment advice.

Adapt the volume filter with Pineify

Pine Script AI Coding Agent can help write or revise the indicator from explicit requirements. Specify the denominator, missing-data behavior, session and price condition, then check the generated script against chart values. It cannot reconstruct volume absent from the data feed.

Keep VROC as 100 × (volume − volume[N]) / volume[N]. Return na for missing endpoints or a nonpositive reference. Add an editable price condition and trigger the filter only at bar close. Expose the reference volume in the Data Window.

Open Pine Script AI Coding Agent

Frequently asked questions

Sources and calculation notes

Reviewed October 17, 2026. TradingView documents one-bar volume percentage change and the general N-period ROC definition. This page applies that definition to volume; the numerical tables are hypothetical arithmetic examples, not market observations or backtest results.