How to Draw Trendlines: Connecting Highs and Lows and Reading Breakouts

A trendline is a simple line between two points, but the chosen points can change the interpretation completely. This guide explains the basics and ways to reduce subjectivity.

The basic idea: connect two points

A trendline visualizes price direction with a straight line. Connect lows to lows or highs to highs. Two points define a line, and the guide treats a third touch as additional confirmation of its relevance.

• Rising trendline: Connect two or more successively higher lows. The line slopes upward below price.
• Falling trendline: Connect two or more successively lower highs. The line slopes downward above price.

Unlike a calculated moving average, a trendline is drawn manually. Different people can draw different lines on the same chart.

Support, resistance and breakouts

Trendlines can represent support and resistance. A rising line may act as support beneath price, while a falling line may act as resistance above it.

A clear move through the line is a breakout, though distinguishing it from a brief touch or false move is difficult. Common supporting checks include:

False breakouts that quickly return inside the line are common. Avoid treating one signal as conclusive.

A concrete example

Reducing subjectivity

Subjectivity is a major weakness. One reader may consider support intact while another sees a break. These practices make the process more consistent.

1. Choose the basis beforehand: Use either wicks or closes consistently when selecting anchor points.
2. Do not force the fit: Choosing points merely to support a desired line encourages seeing only the preferred picture.
3. Count touches: The guide gives more weight to three or more touches than to two.
4. Compare other evidence: Overlap with Fibonacci retracements or horizontal support and resistance can add context.
5. Keep records: Save the drawn line and outcome in a trading journal to identify recurring biases.

A trendline helps organize the current flow and define invalidation; it does not predict the future with certainty. Combine it with trend-versus-range assessment, volume and other evidence, and define a stop before entry. Analysis cannot eliminate loss risk, and leverage increases the consequences of errors.