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Bar charts

Bar charts

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Explainer Video

Tutor: Alice

Summary

Bar Charts

In a nutshell 

Bar charts help you to visualise data at a glance. They make information involving 'how many' easy to compare and understand. 


Definitions

Frequency

How many of something.

scale

The amount that the frequency axis goes up in.



Interpreting bar charts

A bar chart has two labelled axes: one for frequency and one for categories. The height of each bar represents the frequency of items in that category.


Example 1

Bar chart to show students' favourite animals

Maths; Statistics; KS2 Year 3; Bar charts


Note: The scale of a bar chart could be anything from ones to twos to hundreds to thousands!

​


Presenting data using bar charts

You can draw a bar chart from a table to present the data in a more visual way.


Drawing bar charts

​​procedure

1.
Draw and label the axes: one for frequency and one for the categories.
2.
Pick an appropriate scale for the frequency.
3.
Draw the bars so that their height represents the right frequency.


Example 2

Here the bar chart has been drawn from the tally chart shown below.       

            

​DayTallyTotalMonday∣∣2Tuesday∣∣∣∣5Wednesday∣∣∣∣4Thursday0Friday∣∣∣3\begin{array}{c|c|c}\text{Day}&\text{Tally}&\text{Total} \\\hline\text{Monday} & || & 2 \\ \hline\text{Tuesday} & \cancel{||||} & 5 \\\hline\text{Wednesday} & |||| & 4 \\\hline\text{Thursday} & & 0 \\\hline\text{Friday} & ||| & 3 \end{array}DayMondayTuesdayWednesdayThursdayFriday​Tally∣∣∣∣∣∣​∣∣∣∣∣∣∣​Total25403​​​​

​ Bar chart to show carrots eaten by a rabbit on each day of the week.    

Maths; Statistics; KS2 Year 3; Bar charts
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Bar charts

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Bar charts

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FAQs - Frequently Asked Questions

How do I draw a bar chart?

1. Draw and label the axes: one for frequency and one for the categories. 2. Pick an appropriate scale for the frequency. 3. Draw the bars so that their height represents the right frequency.

What are bar charts?

Bar charts help you to visualise data at a glance. They make information involving 'how many' easy to compare and understand.

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