VWAP: Volume Weighted Average Price

A session that opened, then spiked

An index opens at 18,400, trades heavily between 18,380 and 18,420 for two hours, then spikes to 18,520 on a news release with far less volume behind it. VWAP will sit close to 18,400, because that is where the volume was, even though the last price is 120 points higher.

Read that correctly and it tells you something useful: almost everyone holding a position from this session is underwater on a short and comfortably ahead on a long, and the price that most participants actually transacted at is 120 points below where the market is now. That is a statement about positioning, not a prediction. It suggests where reactions might occur if price returns, and the profit calculator makes it easy to check whether a 120 point move back to VWAP is worth trading for once your costs are included.

Anchored VWAP

A variant worth knowing is anchored VWAP, where instead of starting at the session open you start the calculation from a specific event: a major high, a gap, an earnings release, a policy decision. The line then shows the average price paid by everyone who has traded since that event.

This is a genuinely different tool, because it is no longer tied to the session and can run for weeks. It answers a specific question: is the average participant who bought after that event in profit or not? That question has behavioural consequences, and it is one of the few volume-derived readings that stays meaningful on higher timeframes.

Where VWAP stops being useful

• Forex has no true volume. On a currency pair VWAP is computed from tick volume, which is a proxy. It works better on indices, futures and stocks where exchange volume is real.
• The session definition matters. A VWAP anchored to a Tokyo open and one anchored to a New York open are different lines. Know which your platform uses.
• It is descriptive, not predictive. VWAP summarises what has already traded. It has no mechanism for knowing what comes next.
• It becomes stale. Late in a session the line is so heavily anchored that it barely responds to new information, which is precisely when new information is often arriving.

One question per session

If you trade intraday, put VWAP on your chart and use it as a single bias question: which side of it has price spent the session on? That one reading is cheap, objective, and it stops the common error of treating a 30 minute rally as a change of character when price has been below the session average all day.

If you trade higher timeframes, skip session VWAP and consider the anchored version from a major event instead. And whichever you use, remember it is a reference for where business was done, not a level anyone is obliged to defend, which is the same caution that applies to session highs and lows generally.