Pie Chart vs Bar Chart: Which Should You Use?
Updated · 2 min read
Pie charts and bar charts can often show the same data. Choosing the right one depends on what you want the reader to do: see a share of a whole, or compare and rank values.
The short answer
| Use a pie chart when… | Use a bar chart when… |
|---|---|
| The parts add up to a meaningful whole | Values are independent (averages, rates, scores) |
| You have about 2–6 categories | You have many categories |
| One or two parts clearly dominate | Values are close and ranking matters |
| The message is “about half” or “a quarter” | The message is “B beats C by 3 points” |
Why bars are usually more precise
Since Cleveland and McGill’s experiments in the 1980s, perception research has consistently found that people compare positions along a common scale more accurately than angles or areas. With bars, every value is measured from the same baseline. With pies, you compare angles and arc lengths that don’t line up.
Where pies still win
Pies communicate “part of a whole” instantly, and they are familiar to every audience. For a simple message like “housing is almost half the budget”, a pie with two or three slices can be more striking than bars.
Quick decision rules
- Do the values add up to a whole? If not, use a bar chart.
- More than six categories? Use a bar chart, or combine small ones into “Other”.
- Do readers need exact differences? Use a bar chart.
- Otherwise, a pie or doughnut is fine. Label the slices directly.