History of ORB
The strategy was invented back in the 1960s by the famous American trader and investor Arthur Merrill, who used it for almost 20 years to trade the Dow Jones Industrial Average (DJIA) index. Although the strategy has some variations in it, the basis remains the same. To find an opening range, some traders use a short-term moving average, most commonly a three-day average.
Another well-known trader, Sheldon Knight, used the percentage of the difference between an N-day high and N-day low to find a range. We prefer to keep things as simple as we can. Thus, using the short-term averages or highs and lows of a certain day is less effective than using price action at the start of the trading session.
Opening range breakout size
There are two ways of measuring the size of the ORB. Here is the first one: the first candle is the last one from the trading session of the previous day. The second candle is the first one created when the market opens. To get the range size you need to take the high/low of the previous closing and the high/low of the day’s opening candle. The distance between these two prices is the size of the opening range.
Here’s how we measure the size of a range:

The other way of measuring the ORB is the high and low of a given period after the market opens. This period is generally the first 30 minutes or the first hour of trading.
During this period, you want to identify the high and low of the day. In addition, you will also want to account for the pre-market highs and lows, as these levels will often act like a magnet for price action after the bell rings. Let’s look at the same figure with a different measure.

Opening range breakout calculator
As you already know, the most important part of opening range trading is the breakout. What you probably don’t know is that you can use an ORB calculator to help you find trading opportunities and use them in your favor. You can Google “Opening Range Breakout Calculator” to find one of these sites.
These sites calculate the high and the low of the opening range for you, so it should be easier to start trading. However, we strongly recommend you watch our Gap and Go video because in it you will find several tools that will help you look for gaps in price. Thus, it will be much easier for you to set ORB levels.
ORB trading strategy
The strategy consists of several steps:
Look for gaps in stock prices. Gap scanners are available online for free, so this shouldn’t be hard. In addition, you can watch our Gap and Go video. It will provide more information about gap searching.

After you find a suitable gap, open the chart of a stock and wait for the start of the trading session. For US stocks, the action begins at 16:30 GMT+2 from September to March, and at 16:30 GMT+3 from March to September.

Depending on the timeframe you have chosen, wait for the first 4-6 candles to close. Usually, traders choose five-minute candles. Then, define the high and the low of the range like we did earlier in this tutorial.

On the breakout of the range, you enter the trade in the direction of movement. Your stop-loss should be in the range (below the range high for long trades and above the range low for short trades). To maintain good risk management, the take-profit is usually placed twice as far as the stop-loss.

Tips for better trading: