A stock's day range, or trading range, is the highest and lowest prices at which the stock traded during a single day.
The high and low prices for the day can be outside of the opening and closing prices for the day.
Investors use day range primarily as an indicator of volatility. For example, an investor may compare the day range for a stock to the stock's average daily range as an indicator of volatility. Alternately, an investor may look at the difference between a stock's day range and it's net change (the difference between its open and closing price); a greater discrepancy between the figures indicates greater volatility.
