Price tells you what happened. Volume tells you how much conviction was behind it. Relative volume is the simplest way to know whether today's move is something the market genuinely cares about — or just noise dressed up as a signal.
Relative volume compares today's trading volume to what is normal for that specific stock.
The reason it is expressed as a ratio rather than a raw number is that raw volume is meaningless across stocks. Ten million shares is a quiet day for one company and an extraordinary event for another. The ratio makes them comparable.
Imagine a stock breaks above a resistance level it has failed at three times before. That is a breakout — potentially significant. But now ask: on what volume?
The price action is identical in both cases. The meaning is completely different.
Volume is the confirmation layer. It rarely tells you what to do on its own — but it tells you how much to trust everything else you are seeing.
High volume is not automatically bullish. A stock falling 8% on 5x normal volume is not a good sign — it means a great many people wanted out, urgently. Volume amplifies the meaning of the move; it does not determine its direction.
Read them together: direction from price, conviction from volume.
▶ Check any stock free →Educational only — not financial advice. This guide explains general concepts for learning purposes and is not a recommendation to buy or sell any security. Always do your own research and consult a licensed financial adviser before investing.