Charts and Graphs: What the Difference Is and When to Use Each
Charts and graphs are often used as synonyms, but the distinction helps you pick the right visual. Learn what each one shows, the common types and a quick way to choose for your data.
People say charts and graphs as if they were the same thing, and in everyday use that is mostly fine. The terms overlap across software and subject areas. When choosing a visual, it helps to be more specific: are you comparing categories, showing a trend or displaying shares of a total?
Charts and graphs: the short difference
A graph plots values against axes. Line graphs and bar graphs are the classic examples: one axis holds categories or time, the other holds a quantity, and the position of each point or bar tells you its value.
A chart is the broader term. It covers graphs, but also visuals with no axes at all, such as pie and donut charts, tables, flowcharts and organisation charts. This is a useful convention for business data visualisation, rather than a definition followed by every field or software package.
In practice, software and most readers use both words loosely. A bar graph is often called a bar chart, and nobody is confused. What matters is choosing the visual that matches the comparison you want the reader to make.
Choose a chart for the comparison you need
Before picking a type, write down the one comparison the reader should make. Most business questions fall into a handful of patterns:
- How did something change over time? Use a line graph for continuous trends, or a bar graph when there are only a few periods.
- Which item is biggest or smallest? Use a bar graph, sorted from largest to smallest. Horizontal bars work better when labels are long.
- What share does each part take of the whole? Use a pie or donut chart, but only with a handful of slices that add up to a meaningful total.
- How did volume build up over time? Use an area chart, which shows the trend and the magnitude together.
For example, a regional sales table could become a sorted bar graph for ranking or a pie chart for shares. If your report needs both comparisons, use two views rather than expecting one chart to answer both equally well.
Common types of charts and graphs
Bar graph. Compares quantities across categories. The bars start at zero, so length is honest. Works for rankings, survey results and regional comparisons.
Line graph. Shows change over an ordered axis, usually time. Good for trends, seasonality and comparing two or three series.
Area chart. A line graph with the space below filled in. Useful when the size of the total matters as much as its direction.
Pie and donut charts. Show parts of a whole. Readers judge angles poorly, so keep it to about five slices and label the values.
Tables. Use a table when readers need exact amounts, dates or individual values. You can also put a compact data table beside a chart so readers can check a number without estimating it from an axis.
Mistakes that make any chart harder to read
Most bad charts fail in the same few ways. Truncating a bar graph's axis exaggerates small differences. Using a pie chart with twelve slices forces readers to compare tiny angles. Plotting unrelated series on one line graph with two different scales invites false conclusions. And rainbow colour schemes make readers hunt for meaning where there is none.
A good default is one chart, one message, with the message written as the chart title.
Make one in your browser
If you have a small table in a spreadsheet, you can paste it straight into a free chart maker: the first column becomes the labels and each other column becomes a series. Switch between bar, line and pie to see which one makes your comparison clearest, then download it as PNG or SVG. For larger questions across several files, the AI analysis sample shows how ToCharts builds the tables and charts together, with the calculation behind each number.
What this can't do yet
The free ToCharts makers offer bar, horizontal bar, line, area, pie and donut charts. They do not include scatter plots, radar charts, bubble charts, gauges or heatmaps. Available type switches vary by tool page, and a pie chart uses only the first numeric series. Each chart is created and downloaded in the browser.
Frequently asked questions
What is the difference between a chart and a graph?
In business data visualisation, graph often refers to values plotted on axes, while chart has a wider use that includes pie charts and flowcharts. Terminology varies, so check the example or chart type being discussed.
Is a bar chart the same as a bar graph?
Yes. The two names are used interchangeably. Both compare quantities across categories using bars that start at zero, so the length of each bar shows its value.
When should I use a line graph instead of a bar graph?
Use a line graph for a continuous trend over many time points. Use a bar graph when you compare separate categories or only a few periods side by side.
How many slices should a pie chart have?
Keep it to about five slices that add up to a meaningful whole. With more slices, readers struggle to compare angles, and a sorted bar graph works better.
Which chart is best for showing a trend over time?
A line graph is the clearest choice for most trends. An area chart works when the size of the total matters as much as whether it is rising or falling.