VWAP

Introduction

Every indicator so far has been built from price alone. But price tells only half the story of a market — the other half is volume, the amount actually traded. A small move on huge volume and a large move on a trickle mean very different things. VWAP, the Volume-Weighted Average Price, is the most important tool that blends the two. It answers a deceptively simple question: what was the average price actually paid?

That question matters enormously to large participants, for whom VWAP is a daily benchmark of execution quality. For everyone else, it offers a clean reference for whether price is trading rich or cheap relative to where most of the day's business was done.

What VWAP Is

VWAP is the average price traded over a period, weighted by the volume at each price.

Contrast it with a moving average. A 20-period moving average adds up 20 closing prices and divides by 20 — every period counts the same, no matter how much traded. VWAP is different: a price where a lot of volume changed hands pulls the average toward it far more than a price where almost nothing traded.

The intuition: imagine every share that traded today, each tagged with the price it traded at. VWAP is the average of all those tags. Because most shares trade where most activity is, VWAP gravitates toward the price levels that genuinely mattered.

Why It Resets Each Session

The classic VWAP is an intraday measure. It starts accumulating at the session open and builds through the day, so by the close it reflects the whole session's average price paid. The next session, it resets and starts again from that day's open.

This session-anchoring is the defining feature of standard VWAP, and the reason it is primarily a day-timeframe tool. (A related variant, the anchored VWAP, lets an analyst start the calculation from any chosen point — a notable high, low, or event — rather than the session open, to measure the average price paid since that moment. The idea is the same; only the starting anchor changes.)

How VWAP Is Used

1. As an execution benchmark. This is VWAP's original purpose. A large institution that needs to buy a big position over a day cannot just slam the market — it works the order gradually, and then judges how it did against VWAP. Buying below VWAP, or selling above it, is "beating the benchmark." This is why VWAP is watched so closely: a huge amount of real-world execution is measured against it.

2. As an intraday fair-value reference. Because VWAP represents the average price paid, price relative to VWAP describes the session's balance:

• Price above VWAP: the day's buyers are, on average, in control — current price is above what most paid.
• Price below VWAP: sellers in control — price is below the day's average paid.

3. As dynamic support or resistance. Like a moving average, VWAP often acts as a level price reacts to intraday — pulling back to it and resuming, or being rejected at it. Once again, this is a zone of interest, not a guaranteed floor or ceiling.

A Worked Example

A share opens at 50 and trades busily up to 52, with most of the day's volume changing hands around 51.5. It then drifts down to 50.5 on much lighter volume into the close. A simple average of the day's prices might land near 51 — but VWAP sits higher, near 51.4, because the heaviest volume traded up at 51.5 and that activity carries more weight.

An analyst reads this as: "the bulk of today's business was done around 51.4, and price closed below VWAP — sellers had the upper hand into the close, even though the day was net positive." That is a precise description of the session's participation. What it is not: a forecast of tomorrow. VWAP resets at the next open, and the average-price-paid story starts afresh.

The Honest Limits

• VWAP is primarily an intraday tool. The standard version is anchored to a single session and resets daily; it is not a multi-month trend indicator (that is what moving averages are for).
• It lags and describes. As a volume-weighted average of prices already traded, VWAP follows the session — it cannot lead it. Price relative to VWAP describes balance; it does not predict the next move.
• It is a benchmark, not a signal. "Above VWAP" or "below VWAP" tells you where price sits versus the average paid. Like every level in this domain, it is context to weigh, never an instruction.

VWAP brings volume into the picture as a centre of gravity for price. The next two indicators tackle a different dimension entirely — volatility, how much price is moving — starting with Bollinger Bands, which wrap a moving average in a volatility-sensitive envelope.