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Narrow Range Days: The NR7 Idea and Volatility Cycles

A narrow range day is one where the daily range is smaller than in recent days. The best-known version, NR7, marks the day with the smallest range of the last seven days. The idea comes from the work of trader Toby Crabel. The logic rests on volatility cycles. Periods of low volatility tend to be followed by higher volatility, because compressed ranges build up pressure for expansion. When the smallest range in seven days occurs, the following day or two have often shown larger moves, though the direction is unknown.

A simple way to use it is to place a buy stop above the NR7 day's high and a sell stop below its low for the following session, canceling one when the other triggers. The stop for each sits at the opposite side of the range, so the risk equals the narrow range, which is small by definition.

The strength of the idea is that risk is naturally tight. The weakness is false breakouts, as the market often probes one side and reverses.

Testing is simple. Mark every NR7 on your pair over several years, and record the next day's range relative to the average and whether a breakout followed through.

Results vary across pairs and eras. Treat published claims cautiously, and measure your own.

Practical step: find the NR7 days on your pair over the last year, and compute the average range of the next day compared with the overall average.

Small detail that matters: an NR7 on a Friday or before a holiday is less interesting. Quiet days before quiet periods often just stay quiet. The same goes for the days before a big scheduled event, like a Fed decision, where the market is simply waiting. In that case the narrow range is about the calendar, not a volatility cycle building up pressure, and the expansion often happens on the event itself, which is a much harder trade. I'd add a filter when testing: exclude NR7 days followed by a holiday or with a major event the next day, and compare the results with and without them. The cleaner subset is usually more useful.

The tight risk is the real appeal. Even with lots of false breaks, the losses are small, so it's worth measuring on your own pair rather than dismissing it. The thing to watch is cost. On a pair with a narrow daily range, the spread can be a meaningful part of the stop, especially if your orders trigger in the quiet Asian hours. You might get better results by only activating the orders from the London open, which for us is 8am or 9am depending on the season. Test both versions. Small details like activation time can turn a breakeven idea into a usable one, or show it doesn't work.