Bar Chart vs Line Chart: When to Use Which?
Choosing the wrong chart type can make your data hard to understand. Bar charts and line charts are the two most common visualization types, but they serve different purposes. This guide compares both to help you pick the best chart for your data.
1. When to Use Bar Charts
Bar charts are best for comparing distinct categories. They show differences in size or value clearly, making them ideal for comparing metrics like sales by region or page views by page.
2. When to Use Line Charts
Line charts are designed to show continuous trends over time. They connect data points with lines, making them perfect for tracking variables like monthly revenue, daily active users, or temperature changes.
3. Key Differences and Best Practices
Bar charts emphasize individual category comparisons, while line charts focus on trends and the connection between data points. Ensure your categories are sorted logically in bar charts, and use chronological order for line charts.
Practical Visualization Examples
Revenue Over Time
Output Visual: A line chart showing monthly revenue trends.
The line chart clearly visualizes seasonal growth and revenue trends over the year.
Frequently Asked Questions
Can I use a line chart for categorical data?
No. Connecting categorical data points with a line implies a continuous relationship that does not exist, which can mislead viewers.
How many categories is too many for a bar chart?
A bar chart is easiest to read with fewer than 15 categories. For larger sets, consider using a horizontal bar chart or filtering the data.
Conclusion
Using the right chart type makes your data stories clear and effective.
Prabhash Kumar
Founder & Senior Product Engineer
Prabhash Kumar is a full-stack engineer and data systems architect with a background in secure cloudless processing. He compiles in-depth data visualization tutorials and builds open-source browser tools. Last updated: July 2026.