What is a Trend Line? | Top Trendline Trading Strategies

Trendlines are one of the simplest, yet most powerful tools used by traders. Read on to learn what they are, tips for drawing them and to learn three powerful trendline trading strategies.

What is a trendline?

A trendline is a line drawn through a chart to show the trend. In the context of trading, trendlines are drawn on price charts to show the trend in the price. Traders use this information to determine whether to buy or sell in the direction of the trend. Trendlines can be used for a stock price or forex currency pair or cryptocurrency. Trend lines are one of the best-known price action indicators used in technical analysis.

How does a trendline work?

The classic way to draw trendline is by drawing a straight line connecting a series of swing highs or swing lows. An up-trend line is drawn through the swing lows and a down-trendline is drawn through the swing highs. In that way the trendline is acting as support to an uptrend or as resistance to a downtrend. Trendline are often referred to as ‘dynamic support & resistance’ meaning that they move with the price trend.


up and down trendines

How to draw a trend line

The way you draw a trendline is by starting on the Lefthand side of the chart and drawing the line towards the right. The rule of thumb is that a trend line must be drawn through at least three ‘swings’ in the price to be valid.

To draw an uptrend line, you start with a swing low on the left-hand side of the chart and connect it to a higher swing low.

To draw a downtrend line, you begin with a swing high on the Lefthand side of the chart and connect it to a lower swing high.

How to use trend lines in trading

How do you trade a trend line? The idea of using a trend line is to determine the direction of the price trend. Traders can then to decide with the trend with the idea that the trend will continue or against the trend because they think the trend will reverse. With both strategies, the interpretation of the trendline is the same

  • While the price is above the uptrend line the trend is up, which is bullish.
  • While the price is below a downtrend line, the trend is down, which is bearish.

Trend following

Trend following is a trading strategy that buys when the price is rising and sells short when the price is falling. One popular trading method to determine whether the overall price trend is higher is by using an uptrend line. Likewise, a downtrend can be determined by using a downtrend line.

Countertrend trading

Countertrend trading is a strategy that sells when the price is rising and buys when the price is falling. This closer to the basic principle of investing to ‘buy low and sell high’. For short term traders, the reason to countertrend trade is with the idea of a reversion to the mean, meaning that after trending in one direction, the price will eventually return to is average price.

SPECIAL TIPS for using Trendlines

1 Is there a trend?

The ultimate newbie mistake with trendlines that you want to avoid is using a trendline when there is no trend. The clue is in the name!

Looking at this chart below - the market is just going sideways. It is therefore no surprise that all these trendlines don’t work.


trendlines sideways trendSource: Action Forex

2 Trendline Angles

Some platforms have a trendline tool, which shows you the angle of the line. In MT4 (Metatrader 4) this is known as ‘Trendline by Angle’. The perfect trendline is about 45 degrees. More than 45 degrees means the price is rising too quickly and is liable to easily break the trendline, even if the trend continues. Less than 45 degrees means the trend is weaker, almost trading sideways.

3 Number of touches

The more swing points that a trendline goes through, the stronger the trendline because it becomes more recognisable to more traders. BUT after five touches, the chance of the trendline ‘breaking’ increases significantly.

4 Zoom out

Remember to zoom out your chart in your trading platform so that you see the start of the trend you are trying to represent with the trendline. For example, if drawing an uptrend try to find the low of the previous downtrend and start your trendline there, or perhaps the next the swing low.

5 Trendline zones

Trendlines are not an exact science! It is rare that the price will perfect touch a trendline and then reverse. The trendlines should be considered an ‘area’ rather than a precise price point. Understanding this helps with determining your entry price and stop loss.


trendline zones

Forex trend line analysis

Trendline as especially popular in forex trading as well as cryptocurrency trading because technical analysis overall is used more than fundamental analysis among individual traders. Forex markets are driven by changes in interest rates, but the interest rates set by central banks rarely change. This means prices move according to traders’ expectations of interest rates, which is a lot harder to read. Technical analysts argue that the most consistent way to read the sentiment of the traders is through the price action and with analytical tools like trendlines.

Trendline trading strategies

There are many ways to use trendlines but here we explain the two most common trendline trading strategies as well as a lesser known but very effective third option.

1)      Trendline bounce

The goal of this strategy is to trade with the trend that is being supported by the trendline. Either buying close to an uptrend line or selling close to a downtrend line.

Strategy steps:

  1. Establish price trend: Up, down or sideways
  2. Draw a trendline with at least three connecting swing points
  3. Extend the trendline into the future
  4. A) Wait for the price to touch the trendline on another occasion
  5. B) Set a limit order at the trendline (adjust as price moves)
  6. Enter a trade in the direction of the trend when price has touched the trendline
  7. Place a stop-loss order under the previous swing low in an uptrend (above the previous swing high in a downtrend)
  8. Set a take profit order at least 2:1 the size of the stop loss

Chart example:

trendline bounce

2)      Trendline breakout

The trendline breakout can be used as a form of countertrend line trading, but that’s not what we are advocating here. How can a trendline break be a trend following strategy? It’s done by trading the breakout of short-term trendlines in the direction of the bigger trend!

Strategy Steps:

  1. Establish long term trend
  2. Wait for price to ‘correct’ or go against the long term trend
  3. Draw a trendline for this short term correction
  4. Wait for the price to breakout past this trendline
  5. A) Buy at the break of a downtrend line or sell at the break of an uptrend line
  6. B) Set a stop order past the trendline to enter on the breakout
  7. Set your stop loss on the other side of the trendline
  8. Set a take profit order at least 2:1 the size of the stop loss

Chart example:

inner trendline breakout

Source: Forex Strategy Resources

3)      Trendlines with confluence

Trendlines are a powerful tool but no one technical indicator or price action trading system is perfect. You will always increase your probability of success on a trade by incorporating more than one analysis technique and waiting for opportunities when the methods all conclude the same.

For example:

Trendlines with Fibonacci retracement

In this example an opportunity to buy at a rising trendline is corroborated by an opportunity to buy at the 61.8% Fibonacci retracement level.


Trendlines with moving averages

Here a rising trendline matches the widely-watched 200-day moving average.

Trendlines with Japanese candlestick patterns

Here trendline bounces are supported by bullish engulfing candle patterns.


To practise drawing and trading with trendlines, register for a free FlowBank demo trading account

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