Is Session VWAP the same as a moving average?

No. A moving average looks back a fixed number of bars from every point, while session VWAP accumulates from a fixed anchor and drops nothing until the reset. That is why it stiffens through the day: by the afternoon, a single bar can barely move a calculation that already holds the whole session's volume.

Does price always come back to Session VWAP?

No. In balanced, two-sided sessions price rotates around VWAP repeatedly, but on strong trend days it can leave the line at the open and never look back. Treat a return to VWAP as a scenario to plan around, not an assumption; trend days are precisely the days the assumption fails.

How is Session VWAP anchored on 24-hour markets like crypto?

By convention. With no exchange bell, platforms typically reset at midnight UTC or at the venue's day boundary, and some traders anchor to a futures session or a specific regional open instead. The math is identical; only the anchor choice differs, so two charts can show different session VWAPs for the same market.

Why does Session VWAP barely move late in the day?

Because it is cumulative. Each new bar's price and volume are added to totals that already contain the whole session, so the marginal effect shrinks as volume accumulates. Early prints move the line easily; by the close it takes enormous volume to bend it. That inertia is a feature: the late-day line summarizes the entire auction.

What is a VWAP cross?

A VWAP cross is price closing through the session VWAP line from one side to the other. Traders read it as the average participant's profit flipping sign, and some systems use it as an entry or bias trigger. Crosses during thin midday tape whipsaw frequently, so most rules add a volume or time-of-day filter.

Session VWAP

Session VWAP is the volume-weighted average price of everything traded since the session open, reset at the start of each new session. Session VWAP, also known as VWAP cross, is a Volume & Order Flow concept. The Library holds 1 implementation, ready to run on Vela.

The standard Session VWAP indicator

Session VWAP exactly as classically defined: the faithful reference build of the original formula, free to run in Quant.

VWAP

Indicator

What is Session VWAP?

Session VWAP is the volume-weighted average price of everything traded since the session open, reset at the start of each new session. Each bar contributes its price (commonly the typical price, the average of high, low, and close) multiplied by its volume; the running sum of those products divided by the running sum of volume is the VWAP line. Because busy bars carry more weight than quiet ones, the line tracks where volume actually changed hands, not just where price wandered.

The anchor is what makes it a session VWAP: the calculation starts fresh at the open of each trading session, or at a conventional day boundary on 24-hour markets. Early in the day the line is sensitive, swinging with each print; as cumulative volume builds it gains inertia and flattens. Many charts add standard-deviation bands around the line to show how stretched price is from the session's average.

Session VWAP matters because it is the benchmark many institutional execution desks are measured against: an algorithm tasked with buying near VWAP will slice orders around it all day, which gives the line practical gravity intraday. Price holding above it says the average buyer since the open is in profit; trading below it says the opposite. It is still an average, though. It lags, and it is not guaranteed to act as support or resistance on any given touch.

How to calculate Session VWAP

Session VWAP is cumulative arithmetic, which is why the line behaves differently in the first hour than in the last.

1Define the session anchor: the exchange open for equities and futures, or a conventional day boundary (often midnight UTC) for 24-hour markets. The calculation resets here.
2For each bar since the anchor, multiply a representative price by the bar's volume. The typical price, (high + low + close) / 3, is the common choice on bar data.
3Keep two running totals: the sum of price times volume, and the sum of volume. Session VWAP on any bar is the first total divided by the second.
4Plot the ratio bar by bar. It moves freely early, stiffens as volume accumulates, and jumps back to price at the next session open.

How it's calculated

The volume-weighted average price of the current session, restarting at each session open.

\operatorname{TP}_i = \frac{H_i + L_i + C_i}{3}

\operatorname{VWAP}_t = \frac{\sum_{i=s}^{t} (\operatorname{TP}_i \times V_i)}{\sum_{i=s}^{t} V_i}

\sigma_t = \sqrt{ \frac{\sum_{i=s}^{t} \left( V_i \times (\operatorname{TP}_i - \operatorname{VWAP}_t)^2 \right)}{\sum_{i=s}^{t} V_i} }

\operatorname{Upper}_t = \operatorname{VWAP}_t + k \times \sigma_t

\operatorname{Lower}_t = \operatorname{VWAP}_t - k \times \sigma_t

t: current bar index

s: index of the first bar of the current session (reset at each session open)

i: bar index running from s to t

H_i: high of bar i

L_i: low of bar i

C_i: close of bar i

V_i: volume of bar i

TP_i: typical price of bar i (HLC3)

VWAP_t: session volume-weighted average price at bar t

σ_t: volume-weighted standard deviation of TP around VWAP at bar t

k: band width multiplier (commonly 1, 2, or 3)

Upper_t: upper deviation band at bar t

Lower_t: lower deviation band at bar t

VWAP and its bands reset at the first bar of each new session; weekly, monthly, or custom anchors use the same formula with a different starting bar s.

Some platforms use the close or HL2 in place of typical price.

A VWAP cross is the close crossing the session VWAP line.

How traders use it

As an intraday bias line: many strategies take longs only above session VWAP and shorts only below it, on the logic that the average participant since the open is positioned with the trade. The cross itself (the 'VWAP cross') is also traded as a trigger, though crosses in quiet midday tape whipsaw.
As a mean-reversion anchor: in balanced sessions price rotates around VWAP, so stretched excursions get faded back toward it. Whether fading or following is appropriate is a regime question, covered under VWAP mean-reversion vs trend regimes.
As an execution benchmark: desks and systematic traders compare fills against session VWAP to judge slippage, and scale into positions around the line rather than chasing extended prices.
In confluence with session structure: VWAP read alongside the opening range, the session midpoint, and prior period levels frames the intraday auction; agreement between independent references carries more weight than any single line.

Session VWAP vs other VWAP variants

Anchored VWAP: Same cumulative math, different starting point: an anchored VWAP begins at a user-chosen event such as a swing low, an earnings gap, or a breakout bar. Session VWAP is the special case where the anchor is always the session open.

Rolling VWAP: A rolling VWAP never resets; it maintains a sliding window over the last N bars. It behaves like a volume-weighted moving average, while session VWAP is cumulative from a fixed anchor and gains inertia as the day ages.

Periodic VWAPs: Weekly, monthly, quarterly, and yearly VWAPs apply the same reset logic on longer calendars. Swing traders read them the way day traders read the session line; the different anchors disagree constantly, which is the point of plotting several.

VWMA: A volume-weighted moving average weights only the last N bars and slides forward, so it has no anchor and no reset. VWAP variants answer 'average price since a moment'; VWMA answers 'volume-weighted average of recent bars.'

Session VWAP FAQ

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