Key takeaways
- An uptrend line connects rising swing lows; a downtrend line connects falling swing highs.
- Two points draw a line, but a third touch makes it more widely watched.
- Very steep trendlines tend to break sooner than moderate ones.
- A trendline break warns that the trend may be changing; it does not confirm a reversal on its own.
Contents
A trendline is a straight line drawn on a chart to show the direction and slope of a trend. It is one of the simplest technical tools, yet drawing trendlines consistently takes practice. This lesson explains how to draw them, how to judge their quality and how traders use them.
What a trend is
A trend is a series of swings that move in one overall direction:
- Uptrend: higher highs and higher lows. Over long periods this is associated with a bull market.
- Downtrend: lower highs and lower lows, associated with a bear market.
- Range: highs and lows at roughly similar levels, with no clear direction.
A trendline is essentially sloping support in an uptrend or sloping resistance in a downtrend. If horizontal levels are new to you, read Support and Resistance first.
How to draw a trendline
- Identify the trend on a higher timeframe first.
- Uptrend: connect two or more rising swing lows, with the line running beneath price.
- Downtrend: connect two or more falling swing highs, with the line running above price.
- Extend the line to the right to see where it may sit in the future.
- Look for a third touch. Two points always make a line; a third reaction suggests other traders are watching it too.
Wicks or bodies?
Some traders draw through candle wicks, others through candle bodies. Neither is "correct". Choose one approach and apply it consistently, and accept that the line is an approximate zone rather than a precise barrier.
Judging a trendline's quality
| Feature | Generally stronger | Generally weaker |
|---|---|---|
| Number of touches | Three or more | Only two |
| Timeframe | Daily or weekly | 1-minute or 5-minute |
| Angle | Moderate (roughly 30 to 45 degrees on a typical chart) | Very steep |
| Duration | Several weeks or months | A few hours |
Steep trendlines reflect fast moves that are hard to sustain, so they tend to break earlier. Remember that the visual angle also depends on how your chart is scaled, so compare slopes on the same settings.
Trend channels
If you draw a line parallel to the trendline through the opposite swings, you create a channel. In an up-channel, the lower line acts as potential support and the upper line as potential resistance. Some traders buy near the lower line and take profit near the upper line, while others watch for a break out of the channel.
Trendline breaks
When price closes clearly through a well-established trendline, it suggests the trend's momentum may be fading. However, a break does not guarantee a reversal. After a break, price may:
- reverse and start a new trend in the other direction,
- move sideways in a range, or
- resume the original trend at a shallower angle.
Many traders wait for extra evidence, such as a lower high after an uptrend line breaks, before treating the trend as over.
Worked example: projecting a trendline
Assume, for illustration, that a GBP/USD uptrend line touches a swing low at 1.2500 on day 1 and another at 1.2600 on day 11.
- Rise: 1.2600 − 1.2500 = 0.0100 = 100 pips
- Time: 10 days
- Slope: 100 ÷ 10 = 10 pips per day
On day 16, five days after the second touch, the line would sit at 1.2600 + (5 × 10 pips) = 1.2650.
A trader looking to buy a pullback near the line on day 16 might place a stop 30 pips below it, at 1.2620, and a target at a recent swing high of 1.2740. Risk is 30 pips and reward is 1.2740 − 1.2650 = 90 pips, a ratio of 1:3. You can check this with the Risk-Reward Calculator. The trendline may still fail, which is why the stop exists.
Common mistakes
- Forcing the line. If you must ignore several candles to make a line fit, it probably is not a meaningful trendline.
- Redrawing after every break. Constantly adjusting the line to keep it "valid" removes its usefulness.
- Trading against the higher-timeframe trend because of a line on a very short chart.
- Treating the first touch after a break as a guaranteed retest. Sometimes price never comes back.
Summary
Trendlines connect swing lows in uptrends and swing highs in downtrends, acting as sloping support or resistance. They gain credibility with more touches, longer timeframes and moderate angles. Channels add a parallel boundary. A break is a warning, not proof of reversal. Use trendlines alongside other evidence and always define your risk. Next, Moving Averages offer a smoother, formula-based way to follow trends.
Glossary terms in this lesson
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Practice worksheet
Practice worksheet
4 exercises to try on paper. Print it, save it as a PDF from the print dialog, or download a plain-text copy.
- On a daily chart, find a clear uptrend and draw a trendline through at least two swing lows. Count how many times price touched it.
- Draw a parallel line through the swing highs to create a channel. Is price respecting both lines?
- A downtrend line falls from 1.1200 to 1.1050 over 15 days. Calculate its slope in pips per day and project its value 4 days later.
- Find one trendline break on any pair and describe what happened in the following 10 candles.
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