Pie charts are a circular chart divided into sectors, illustrating proportion. I remembered learning them when I was in primary school. Apparently it was invented by this person called William Playfair in 1801.
Pie charts are simple to understand but rather limited because:
1. Can only show a single data series.
2. Can only show limited slices else it becomes cluttered.
Here is a clever twist by using ring charts instead. The following chart was created in Microsoft Excel.
The awesomeness of this beautiful ring chart are:
1. Shows multiple series data instead of just one data series. I’ve taken advantage of this property by showing aggregated revenue data in the outer ring. The inner ring shows a detailed breakdown of monthly revenues.
2. Presents multiple slices of information without being overly cluttered. This needs a careful use of colours though.
To create this ring chart in Microsoft Excel, use this data format.