--- title: "What Are VWAP Bands?" description: "VWAP bands add standard-deviation envelopes above and below VWAP, showing how statistically far price has moved from the session average." canonical: https://www.getswoopr.com/technical-analysis/indicators/vwap/vwap-bands-explained/ source: "Swoopr Investment: https://www.getswoopr.com" --- ## Direct Answer VWAP bands are envelopes drawn at VWAP +/- 1 standard deviation and VWAP +/- 2 standard deviations, where the standard deviation is computed from the intraday volume-weighted price deviations. If volume-weighted prices were normally distributed, about 95% of them would fall within 2 standard deviations of VWAP; intraday distributions often have heavier tails, so the real share can differ. Price at or beyond the 2 SD band is in an extended region with elevated mean-reversion risk. # What Are VWAP Bands? VWAP bands are lines drawn at VWAP plus and minus one and two standard deviations of the session's volume-weighted price deviations. They show whether price is within a statistically normal range of the session average or in an extended region. ## Overview VWAP alone shows where the session's average transaction occurred. VWAP bands add a volatility dimension by showing how spread out the session's transactions have been around that average. A narrow band indicates a tight, low-volatility session where most transactions occurred near VWAP. A wide band indicates a volatile session where transactions have spread significantly above and below the average. The conceptual basis is similar to Bollinger Bands, which add standard deviation envelopes to a simple moving average. The key difference is that VWAP bands use a volume-weighted standard deviation, giving more weight to high-volume periods and making the bands more responsive to where actual trading is occurring. ## The Calculation For each bar i in the session, the contribution to the volume-weighted variance is: **Variancet = ∑[Vi × (Pi - VWAPt)²] / ∑Vi** The standard deviation is the square root of this variance. The bands are then: - **Upper 1 SD:** VWAP + 1 × SD - **Upper 2 SD:** VWAP + 2 × SD - **Lower 1 SD:** VWAP - 1 × SD - **Lower 2 SD:** VWAP - 2 × SD Most platforms compute this automatically. Check whether your platform offers this as "VWAP bands" or "VWAP standard deviation bands" in the indicator settings. ## How Traders Use VWAP Bands The primary use of VWAP bands is as a context layer for mean-reversion and extension assessment: - **Price between +/-1 SD:** Within normal range for the session. No particular extension signal. - **Price between 1 SD and 2 SD:** Mildly extended. Watch for momentum slowdown or consolidation but not necessarily a reversion trigger. - **Price at or beyond 2 SD:** Statistically extended. Mean-reversion risk is elevated. This is the primary mean-reversion entry context for traders using VWAP bands. See [when VWAP mean reversion makes sense](https://www.getswoopr.com/technical-analysis/vwap-setups/vwap-mean-reversion/). Bands also contract and expand dynamically with session volatility. On quiet days, reaching 2 SD requires a smaller absolute price move. On volatile days, the bands are wider and reaching 2 SD requires a larger move. This adaptive feature is what makes VWAP bands more useful than fixed percentage bands for consistently identifying extended conditions. See [percentage vs. standard deviation bands](https://www.getswoopr.com/technical-analysis/indicators/vwap/vwap-percentage-vs-standard-deviation-bands/). ## Limitations and Context - **Early-session bands are unreliable.** In the first 30 minutes, the standard deviation is based on very few bars and moves dramatically. Band levels during this period carry little statistical meaning. See [early session VWAP reliability](https://www.getswoopr.com/technical-analysis/indicators/vwap/early-session-vwap-reliability/). - **Bands do not prevent continuation.** On strong trend days, price can reach the 2 SD band and continue further without reverting. See [when VWAP fails on trend days](https://www.getswoopr.com/technical-analysis/vwap-setups/when-vwap-fails-on-trend-days/). - **The statistical interpretation assumes normally distributed returns.** Intraday price distributions often have heavier tails than a normal distribution, so "statistically unusual" at 2 SD is a guideline, not a precise probability statement. ## Frequently Asked Questions ### What are the standard VWAP band levels? The most common VWAP band levels are +/- 1 standard deviation and +/- 2 standard deviations from VWAP. Some traders also use +/- 3 SD for extreme extension identification. The specific levels depend on the platform and the trader's preference. ### Are VWAP bands the same as Bollinger Bands? They are similar in concept but not identical. Bollinger Bands add standard deviation envelopes to a simple moving average. VWAP bands add volume-weighted standard deviation envelopes to VWAP. The volume weighting makes VWAP bands more responsive to where actual trading volume is concentrated. ### Do VWAP bands reset each session? Yes. VWAP bands accumulate from the session open along with the underlying VWAP and reset at the next session open. Early in the session, both VWAP and its bands are based on a small sample and are unreliable. ### Can I use VWAP bands on anchored VWAP? Yes. VWAP bands can also be applied to anchored VWAP, extending the standard deviation envelope across multiple sessions from the anchor point. The interpretation is the same: price at 2 SD from the anchored VWAP is in a statistically extended position relative to the anchor-period's transaction distribution. ### What happens at the 2 SD band that makes it a mean-reversion signal? At 2 SD, approximately 95% of the session's volume-weighted transactions have occurred closer to VWAP. Price being at the 2 SD level means the current price is in the outer tail of the session's transaction distribution, which historically has been associated with elevated probability of mean reversion back toward VWAP. ## References - [CMT Association: Chartered Market Technician body of knowledge](https://cmtassociation.org/) - [VWAP Percentage vs. Standard Deviation Bands](https://www.getswoopr.com/technical-analysis/indicators/vwap/vwap-percentage-vs-standard-deviation-bands/) - [How Far From VWAP Is Extended?](https://www.getswoopr.com/technical-analysis/indicators/vwap/distance-from-vwap/) - [When VWAP Mean Reversion Makes Sense](https://www.getswoopr.com/technical-analysis/vwap-setups/vwap-mean-reversion/) ## Disclaimer This page is for educational purposes only and does not constitute investment, financial, or trading advice. VWAP and related indicators reflect historical price and volume data and do not guarantee future results. Any worked examples use hypothetical figures only. Swoopr Investment is not a licensed investment advisor; consult a qualified professional before making trading or investment decisions. S By [Swoopr Editorial Team](https://www.getswoopr.com/authors/swoopr-editorial-team/) The Swoopr Editorial Team researches and writes our technical and fundamental analysis education content, drawing on established market-structure and indicator methodology from primary industry sources. Content is reviewed for accuracy before publication. Questions or corrections? See our [corrections policy](https://www.getswoopr.com/legal/corrections-policy/) or read more about our [editorial standards](https://www.getswoopr.com/legal/editorial-policy/).