Summary  
Demonstrates how to add and customize trendlines on data visualizations by choosing trendline types (e.g., linear, polynomial), setting forecast ranges, and adjusting style attributes.

General domain of usage  
Data forecasting and analysis

**Trendlines** help identify patterns and highlight overall trends in data.

In this lesson, you will learn how to add a trendline to a chart and customize its color, width, and style to make trends clearer and easier to interpret.

Task Template

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- Add a **Trendline** using the **Chart Design** tab → **Chart Layouts** group → **Add Chart Element** → **Trendline** (e.g., Linear);
- Open **Format Trendline** by right-clicking the trendline to customize its settings;
- Adjust the **Forecast Forward** value to extend the trendline into future periods;
- Change the trendline type to **Polynomial** and set the required **Order**;
- Modify the **line color** and style in the formatting options to make the trendline more visible.

Dive into the world of Excel with this comprehensive video course, designed to take you from basic navigation to mastering functions and basic data analysis. Starting with foundational skills like data entry and cell formatting, you'll quickly progress to using powerful tools. Whether you're organizing large datasets, performing statistical analysis, or creating dynamic charts, this course equips you with the practical skills needed in today’s data-driven environment.

Adding Trendlines to Excel Charts

Key Points