Pyramid Charts in Geography
What is a pyramid chart?
A pyramid chart is often referred to as a population pyramid as they are typically used to present age-sex data for an area. They look like two bar charts on their sides. They are usually presented as five or ten year age groups with males on one side and female on the other. Horizontal bars are drawn to present the number or proportion of males and females in each age group.
When is using a pyramid chart appropriate?
A pyramid chart is appropriate for presenting population data to show the age and gender breakdown of a country’s population. Pyramid charts can be used when two sets of continuous data are available, for example, a pedestrian count for a continuous timescale showing people moving in two directions.
Creating a pyramid chart
There are two ways of presenting population pyramids. The first is with the y-axis being plotted to the left (see below) and the data expressed as percentages.
The second is with the y-axis being plotted between the bars (as shown below), and in this case, the raw population data is shown.
Draw the horizontal and vertical axis for your pyramid chart. The same scale should be either side of the horizontal (x) axis.
Draw each of the bars to the correct value.
The bars should be coloured the same because it is continuous data.
Reading a pyramid chart
The shape of a pyramid chart provides an overview of the data. In the case of population pyramids, if they have a wide base, it indicates a high birth rate. If the pyramid has a quickly narrowing top, death rates are high. You can extract data from individual bars by using the x-axis to read the value.
Create your own pyramid chart
Create a pyramid graph for the population structure of the USA in 2014 using the data below.
Download a pyramid chart template
Of course, pyramid charts are much easier to create using spreadsheet software such as Excel and Google Sheets. Download an example using the data shown above.
Data Presentation Techniques in Geography
Use the images below to explore related GeoTopics.