VWAP: the institutional indicator of day trading.

While most retail traders watch ordinary moving averages, institutions watch the VWAP. Why? Because an ordinary average treats every price the same, but the VWAP weights by volume — it shows where the real money actually traded. It is day trading's most important and least understood indicator. Let's change that.

01What the VWAP is

VWAP stands for Volume Weighted Average Price . It computes the day's average price, but giving more weight to the prices where more volume traded. Unlike an ordinary moving average, which only looks at price, the VWAP answers: "what was the average price the money actually paid today?".

An important trait: the VWAP resets every day. It accumulates from the session open, so in the morning it swings a lot and gradually "settles" as the day goes on and volume builds up.

02Why institutions use it

When a fund has to buy millions in shares over the course of a day, it does not want to "overpay". The metric they use to judge whether they executed well is the VWAP: buying below the day's VWAP is considered good execution; selling above it as well. Managers are literally evaluated on this.

The practical consequence for you: because so much big money uses the VWAP as a benchmark, it becomes a self-fulfilling support/resistance level. Price reacts to the VWAP because the big players act around it.

03How to trade with the VWAP

1. Filter for the day's bias

The simplest and most powerful use: price above the VWAP = buying bias for the day (favor longs); below = selling bias (favor shorts). Many day traders only trade in the direction of the VWAP side price is on.

2. Dynamic support/resistance

In an intraday uptrend, price rises, pulls back to the VWAP and resumes. That pullback is a classic re-entry zone — you get in near the VWAP with a stop just below. In a downtrend, the reverse.

3. Intraday mean reversion

On sideways days, price tends to come back to the VWAP when it strays too far. Combined with VWAP bands (standard deviations around it), it becomes a reversion strategy.

04Coding the VWAP

//@version=5
indicator("VWAP com viés", overlay=true)

// VWAP is already built into Pine and resets every session
vwap = ta.vwap(hlc3)

plot(vwap, "VWAP", color=color.orange, linewidth=2)

// color the background according to the bias
viesComprador = close > vwap
bgcolor(viesComprador ? color.new(color.green, 93) : color.new(color.red, 93))

// alert on a pullback to VWAP in an uptrend
if viesComprador and ta.crossunder(low, vwap) == false and close > vwap and low <= vwap * 1.001
    alert("Preço recuou ao VWAP em tendência de alta")

import pandas as pd

def calcular_vwap(df):
    # df must cover ONE trading session (VWAP resets daily)
    preco_tipico = (df["high"] + df["low"] + df["close"]) / 3
    pv = preco_tipico * df["volume"]
    return pv.cumsum() / df["volume"].cumsum()

df["vwap"] = calcular_vwap(df)

# bias of the day
ultimo = df.iloc[-1]
if ultimo["close"] > ultimo["vwap"]:
    print("Viés comprador — preço acima do VWAP")
else:
    print("Viés vendedor — preço abaixo do VWAP")

05Frequently asked questions