Insights from ChartsWatcher
Dollar Volume vs Share Volume: Choosing a Scanner Liquidity Filter
Share volume counts shares traded. Dollar volume measures the money value of those trades. Both describe activity, but neither tells you on its own how easily your order will execute.
Why the distinction matters
Consider two hypothetical stocks, each trading 100,000 shares during the same interval:
| Stock | Assumed price for every trade | Share volume | Dollar volume |
|---|---|---|---|
| A | $2 | 100,000 | $200,000 |
| B | $50 | 100,000 | $5,000,000 |
The share counts match, but the money traded differs by a factor of 25. A share-volume-only screen does not reveal that distinction.
For actual trades, dollar volume is the sum of each trade's price multiplied by its share quantity. Multiplying total shares by one current price is only an approximation when prices vary. Check your data provider's calculation before comparing values.
Which scanner filter should you use?
Share volume is useful when you want an explicit count of shares exchanged over an interval. Dollar volume is useful when you want a price-aware view of trading activity across stocks at different prices.
ChartsWatcher documents Absolute volume and Absolute dollar volume as separate filters with selectable periods. Choose matching intervals when comparing them. Today's share total and the last five minutes of dollar volume are not interchangeable observations.
These are also different from relative volume, which compares activity with a historical baseline. A stock can have high relative volume while its absolute share and dollar activity remain small.
Activity is not the same as executable liquidity
A high traded value does not guarantee a narrow spread, enough displayed depth at your intended price, or low slippage. Activity may also be concentrated in a brief period that has already passed.
Before interpreting a scan, check the current bid–ask spread, available size, timestamp and session. Historical volume cannot promise a particular fill for a future order.
A practical starting point
Add share volume and dollar volume to the same research view. Keep the measurement window consistent, inspect any outliers, and decide which quantity answers your question. There is no universal minimum that suits every price range, order size or market session.
Use the filter directory to review the exact definitions before saving a configuration. If your question is whether activity is accelerating, see how to tell if stock volume is rising.