Should I start the Y-axis at zero?
Yes, starting at zero keeps upward or downward moves honest unless a zoomed view is explicitly useful.
What Is a Line Chart?
A line chart plots values over an ordered sequence, usually time. Each point is connected so the audience can see direction, pace, and turning points.
Use it when the main question is how something changed over time.
Start With the Raw Data
Trend charts usually begin with dates or periods plus one or more measures:
| Month | Revenue |
|---|---|
| Jan | R18,000 |
| Feb | R20,500 |
| Mar | R19,700 |
| Apr | R23,300 |
| May | R25,100 |
A table of monthly values becomes a connected trend. That makes it easier to see growth, dips, seasonality, and momentum than reading isolated numbers.
What This Chart Helps You See
Monthly revenue trend
Traffic growth
Performance tracking
Common Ways to Use a Line Chart
- Monthly sales this year versus last year.
- Website traffic over time.
- Ticket volumes, uptime, conversion rate, or production output.
Frequently Asked Questions
How to Use the Live Example Below
Change the numeric values, save them, and watch the slope and shape of the line update.
Tracking Trends Over Time
Line charts are the most powerful tool for visualising continuous data points. While bar charts compare fixed categories, line charts reveal the "story" behind your data—are you growing, plateuing, or declining? They are essential for financial reporting, website traffic monitoring, and performance tracking.
Live Demo: Editable Trend Data
Instructions: Modify the values in the grid below. Watch how the line chart's slope and trajectory change instantly as you save each cell.
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Best Practices for Line Charts
- Avoid Clutter: Don't plot more than 4-5 lines on a single chart.
- Scale Matters: Always check your Y-axis. Starting at zero is usually best to avoid exaggerating small changes.
- Highlight Key Events: Use annotations to explain sudden spikes or drops in your data.
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