Volume measures how many shares actually traded during a given period — and it's one of the simplest ways to gauge whether a price move has real participation behind it or not.
Why Volume Matters
A breakout candle on volume clearly above the stock's recent average suggests real participation is driving the move — more buyers (or sellers) are actually stepping in, not just a handful of trades pushing price through a thin order book. That's part of why volume is one of the six signals covered in how to find options scalping setups.
What a Low-Volume Breakout Suggests
A "breakout" on volume at or below average is generally considered to carry a higher chance of failing — commonly cited as a heuristic, not a guarantee. Low participation means it can take relatively little counter-pressure to push price back inside the old range.
Relative Volume vs Average Volume
"Average volume" usually refers to a stock's typical volume over recent sessions (e.g., the 20-day average). "Relative volume" compares current volume, at this point in the session, to what's typical for this same time of day — which matters because volume isn't evenly spread through a session (it's usually heaviest near the open and close).
A stock that typically trades 2 million shares in the first 15 minutes of a session instead trades 6 million in that same window while breaking a key level — that's high relative volume, a stronger confirmation signal than the same price move on a quiet 1-million-share morning.
Watch Volume on a Live Chart
ScalpCharts displays volume alongside price so you can practice reading this together.
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