Choose by analytical task
| Reader's task | Good starting choice | Why |
|---|---|---|
| Compare categories | Bar chart | Lengths share a common baseline |
| Follow change over time | Line chart | Direction and slope are visible |
| Emphasize magnitude over time | Area chart | The fill reinforces volume |
| Show parts of one total | Pie or donut | The whole is visually explicit |
| Show components and totals | Stacked bar | Each bar contains its composition |
| Explore two numeric variables | Scatter plot | Every observation keeps both values |
| Compare a multi-metric profile | Radar chart | The overall shape shows strengths and gaps |
| Show process drop-off | Funnel chart | Sequential narrowing is the message |
| Show one KPI against a range | Gauge chart | One value is placed in context |
| Plan tasks across dates | Gantt chart | Timing and overlap are visible |
Ask these questions first
- What exact comparison should the reader make?
- Are the values categories, ordered measurements, parts of a total, or paired observations?
- Is precise lookup or broad pattern recognition more important?
- How many categories and series must remain readable?
- Could a simple table communicate the answer more honestly?
Prefer the simplest chart that works
Complexity should come from the question, not the design. Start with bars, lines, or a table. Move to a specialized chart only when its structure adds meaning. Add a title that states the subject, include units, and remove any decoration that competes with the data.
Frequently asked questions
What is the best general-purpose chart?
A bar chart is the safest default for comparing categories because readers can judge lengths on a common baseline accurately.
Which chart is best for time?
A line chart is usually best for continuous time, while bars can work for a small number of separate periods.
Which chart should I use for percentages?
Use a pie or donut for a few parts of one total. Use bars when precise ranking or many categories matter.