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How much candles overlap tells you about a trend

Trend quality is hard to put into words, but candle overlap gets close to it.

In a clean trend each candle opens near the previous close and most of its range sits beyond the prior bar. There's little overlap. In a tired or choppy trend each candle spends most of its range inside the one before it. Price is still moving up on the chart, but it's doing it with a lot of back and forth.

You can eyeball this. If you look at the last eight or ten M5 candles and most of them overlap the previous one by more than half, the move is grinding. If most overlap by a quarter or less, the move is pushing.

Why this matters for scalping: pullback entries behave differently in each case. In a low overlap trend, pullbacks are shallow and short, and waiting for a deep retracement often means missing the move. In a high overlap trend, pullbacks are deeper and messier, and entering on the first small dip tends to get stopped by the noise.

So overlap can decide what kind of entry you use, not just whether you trade. A shallow entry in the pushing trend. A deeper entry, or a pass, in the grinding one.

It also helps with exits. When a trend that was pushing starts printing candles that overlap heavily, that change is often visible before any swing point breaks.

Overlap can be measured if you want something firmer than eyeballing. For each bar, take the part of its range that sits inside the previous bar's range and divide by its own range. Average that over the last ten bars. Low numbers mean clean movement, high numbers mean churn. It's a few lines in Pine or MQL, and it gives you something to filter on in a backtest. Just be aware that the number will rise on every quiet session for reasons unrelated to trend health, so compare it within the same session rather than across the whole day. A ten bar average is a reasonable start. Shorter windows jump around too much to read, and longer ones lag the change you're trying to spot, which defeats the purpose of measuring it at all.

Watch what happens to overlap at a level. A trend that's pushing cleanly and then starts overlapping right as it reaches an obvious higher timeframe level is telling you there's a fight going on there. That's different from overlap that appears in the middle of nowhere, which is often just a lunch lull or a pause before data. The location of the change is as informative as the change itself, so it helps to note where on the chart the overlap picked up rather than only that it did. That makes overlap a decent early warning for trailing stops too. When the bars start stacking on top of each other right at a level, tightening a trail is a reasonable response.

Timeframe changes the read a lot. On M1 overlap is high almost all the time because the bars are so small relative to the spread and normal noise. That doesn't mean M1 trends are always weak, it means the measure doesn't work well there. M5 and M15 are where it's most readable for intraday work. Some people check overlap on M15 to judge the trend and then use M1 only for the entry itself, which keeps the noise of the small bars out of the decision about trend quality. It also changes with the pair. Crosses tend to show more overlap than majors on the same timeframe because they're thinner, so a reading that looks choppy on EURGBP might be normal for it.

News bars distort it. A single large release candle will have almost no overlap with the bar before, and the bars right after a release often overlap heavily as price digests the move. If you're using an overlap reading for filtering, it makes sense to exclude the ten or fifteen minutes around a scheduled release, otherwise you'll get a spike of clean movement followed by a spike of churn that tells you nothing about the trend you were actually trying to judge. Holidays and the last Friday of the month are similar, with odd flows that make overlap jump around for reasons unrelated to the trend.

Candle overlap is a nice way to quantify trend quality. It also changes predictably through the day. During the first hour of London, overlap on EURUSD tends to be low, then it rises through the late morning as the move tires. A rising overlap ratio around 10:30 or 11:00 London is often a sign the morning trend is ending rather than pausing. A simple rolling measure of how much each bar overlaps the previous one, plotted under the chart, makes the change easy to see.