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📊 Supply/Demand · Volume

Complete Guide to Volume Ratio (Relative Volume)
— How to Catch Surge Supply/Demand

Is a volume surge a precursor to a rally, or a trap? We explain the calculation and practical interpretation of volume ratio, which catches a shift in supply/demand as a multiple of average volume.

Written by Dawn · IT Engineer · Published
💡 Key takeaway — This indicator measures how many times normal volume traded. A surge near the bottom can be an accumulation signal, but a surge near the top can be distribution (unloading), so "where" it happened matters.

What Is Volume Ratio (Relative Volume)?

Volume ratio (relative volume) is the multiple of today's volume compared to that stock's recent average volume. Absolute volume is hard to compare since scale varies stock to stock, but looking at "how many times normal" tells you at a glance which stock is unusually attracting capital today.

How It's Calculated

Volume ratio = today's volume ÷ average volume over the last N days (20 days at DawnScan)

For a stock that averages 100-man shares (1M), if 300-man shares (3M) trade today, the volume ratio = 3.0. That means "3x normal volume traded," a signal of that much of a shift in interest and supply/demand.

Precursor to a Rally, or a Trap?

A volume surge by itself is neutral. Direction and location determine what it means.

  • Precursor signal — volume rising with a strong close near the bottom or in a sideways range suggests possible accumulation
  • Trap signal — a volume explosion at a high that's already run up a lot can be distribution (unloading supply)

That's why volume ratio needs to be checked alongside OBV accumulation (the balance of up-volume vs. down-volume) and price location. "Where" the volume happened is the key question.

DawnScan's benchmark — a volume ratio of 2.0 or above signals concentrated supply/demand, and 3.0 or above scores extra points as explosive volume. That said, it's combined with price location and OBV to distinguish "bottom concentration" from "top distribution."

Combine With Other Signals

Volume ratio only tells you "the size of interest" — other indicators fill in direction and trend. Check it alongside the Bollinger squeeze (volatility), ADX (trend), and RSI (momentum). For how it all combines, see the pre-surge signal overview and methodology.

Caution — A volume surge doesn't guarantee a rally. Top distribution and manipulative trading can also inflate volume. All information here is for reference only, and the investment decision is your own responsibility.

Check It Now

See which stocks have concentrated volume alongside other signals on today's scan.

📮 Daily US Market Morning Brief — We send an analysis of the previous day's top 10 US gainers (TOP10) and what they had in common, every day at 8am (KST). Telegram @dawnbrief · Free · No ads · Not stock recommendations.

Frequently Asked Questions

What is volume ratio (relative volume)?

Volume ratio is today's volume divided by the average volume over the last N days (20 days at DawnScan). For example, for a stock that averages 100-man shares (1M), if 300-man shares (3M) trade today, the volume ratio is 3.0. The higher this number, the more capital is moving compared to normal.

How does DawnScan use volume ratio?

DawnScan treats it as a strong supply/demand signal and adds bonus points when the volume ratio sits in the 1.4–4.0 range together with a gradual 5-day volume increase (vol_trend of 1.2 or above). A sustained pattern of rising volume is more reliable than a single 1-time spike. On the other hand, a volume ratio of 8x or more is read as climax volume and gets a penalty.

Does a volume surge always mean a good signal?

No. A volume surge (a volume ratio of 8x or more) can actually mark the end (a climax) of a move that's already run far. DawnScan applies a penalty in this case. The ideal supply/demand signal is a quiet, gradual buildup of volume, which is more reliable when observed alongside rising OBV.

How does gradual volume increase (vol_trend) differ from volume ratio?

Volume ratio (vol_ratio) is a simple ratio of how many times today's single-day volume is versus the average. Gradual volume increase (vol_trend), by contrast, measures whether volume over the most recent 5 days is consistently rising versus the period before it. DawnScan requires both indicators together to catch sustained supply/demand inflow rather than a one-off spike.
💧
OBV Accumulation Signal
A volume indicator that tracks supply/demand flow together
🔵
Bollinger Band Squeeze
Combining volume contraction with volatility contraction
📡
What Is a Pre-Surge Signal?
The role volume ratio plays in signal analysis

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