IELTS Writing Task 1: line graphs, bar charts, pie charts and tables

Line graphs, bar charts, pie charts and tables are the visuals most Task 1 practice material is built around, and they all ask for the same thing: a short report that shows you have read the data and can say what matters. A report often loses marks through structure: no overview, every number listed, or an opening that copies the prompt. This guide gives you a shape for the report, a way to choose what to include and the language for trends and comparisons.

What IELTS.org asks for

IELTS.org’s Academic Writing format page says that in Task 1 you may be given one or more graphs, charts or tables, or a diagram of an object, device, process or event. You describe, summarise or explain the information in your own words, and you must write at least 150 words. The page suggests spending about 20 minutes on it, because Task 2 contributes twice as much to the Writing score. It also says the style should be academic or semi-formal and neutral, and that the answer must be a whole piece of connected text, not notes or bullet points.

The page also says you must include the most important points and that some minor points or details may be left out. Notice what is missing. IELTS.org does not say how many paragraphs to write, where the overview goes or how many figures to quote. Those are choices, and the advice below is a shape that fits the criterion, not a rule of the test. The whole test is laid out in the guide to the IELTS Writing test format.

What Task Achievement asks at bands 6 and 7

The site’s Writing band descriptors explorer paraphrases the public descriptor for Task Achievement in Task 1. At band 6, the report gives a summary of the overall picture, the information you picked to report is the right information, and the main features stand out. Some of the supporting detail may be badly chosen or may not match the figures. A common band 5 picture is the opposite: figures taken one by one in the order they sit on the page, with no sentence saying what the whole thing shows.

At band 7, the summary states the main movements or contrasts clearly enough that a reader does not have to hunt for it, and the key features are presented and given prominence. They may still be named more fully than they are developed. So the three habits the descriptor points to are an overview, selection and accurate supporting data.

A four-paragraph shape

A shape that covers what the descriptor describes has four paragraphs.

1. Introduction. One sentence saying what the visual shows, paraphrased: what is measured, for whom, over what period or in which places.
2. Overview. Two sentences at most, with no detailed figures. State the main movement, the biggest contrast, or the overall ranking.
3. First detail paragraph. One group of features, such as the categories that rose, the biggest values or the first period, with figures to support them.
4. Second detail paragraph. The other group, with figures and a comparison back to the first.

Four short paragraphs also make the organisation visible, which helps Coherence and Cohesion. The post on maps, charts and tables covers the overview sentence in more depth, so this guide does not repeat it.

Choosing what to compare

Before you write, spend a minute on the visual and find four things: the highest value, the lowest value, the biggest change and the clearest contrast between items. Those usually give you your overview, and the detail paragraphs are built around them. How you choose depends on the visual.

• Line graph. Look at direction, the end points and any crossing, peak or dip. Trends are the story, so the introduction names the period and the overview names the overall direction for each line.
• Bar chart. Decide whether to group by category or by year, then keep to that. Comparing within a group and then between groups is clearer than describing every bar in turn.
• Pie chart. There is no trend in one pie, so describe shares: the largest, the smallest and any two that are close. With two pies for different years, the comparison is the change in shares.
• Table. Pick the extremes in a row or column and one or two comparisons. A table of twenty values needs six or seven in your report, chosen because they carry the pattern.

The language of trends and comparisons

Trend language is exact, so use words that describe the shape you see.

• Up: rose, increased, climbed, grew, went up.
• Down: fell, decreased, declined, dropped.
• Flat: remained stable, stayed at, levelled off.
• Peaks and lows: peaked at, reached a low of, hit its lowest point in.
• Speed: sharply and steeply for fast change; steadily and gradually for slow or regular change; slightly for small change.

“Rose steadily” and “rose sharply” describe different shapes, so check the slope before you choose. For comparisons, use structures that do the work of two sentences: higher than, twice as much as, the largest of the four, similar to, in contrast. For shares, “accounted for” and “made up” say that a category is a part of a whole.

Tense follows the data. A graph covering 2000 to 2020 needs past forms, a chart with no dates can use the present, and a projection to a later year needs future forms. The prompt will tell you which, and an inconsistent tense is an avoidable error in Grammatical Range and Accuracy.

An invented example

The following is invented for illustration and is not from a past paper. The visual is a line graph with three lines, showing the percentage of adults who cycled to work in City A, City B and City C between 2000 and 2020.

Introduction: “The line graph compares the proportion of adults who cycled to work in three cities over a twenty-year period.”

Overview: “Overall, cycling to work became more common in two of the cities, most noticeably in City A, while the figure for City B stayed close to where it started.”

First detail sentences: “City A began at about 12 per cent and rose steadily to 30 per cent, overtaking City B around 2012. City C also grew, but more slowly, from 8 to 18 per cent.”

Second detail paragraph, in outline: City B’s figure, its small movement and the way it sits between the other two at the end, with one comparison back to City A.

Look at what the overview does. It commits to a direction, names the biggest mover and mentions the city that did not change. It uses no figures, so the figures can do their job in the detail. It also says more than the introduction, which is the point: an overview that restates the introduction does not give the reader a summary.

Traps

• Listing every number. Leaving one out feels risky, but a report that goes through every value has made no selection, and the descriptor looks for selection.
• No overview. Without a sentence naming the overall pattern, the report reads as a list. Writing the overview first protects you from forgetting it.
• Giving opinions or reasons. You are asked to describe the information, so do not explain why cycling rose or say what the cities should do.
• Fewer than 150 words. IELTS.org says a short answer may not give enough evidence of the language needed for higher bands.
• Copying the prompt. The task asks for your own words. Change the verb, the noun phrase and the way the period is expressed.
• Approximating loosely. “About 12 per cent” is fine for a value near 12. Calling 18 “about 20” starts to misstate the chart.
• Choosing by vocabulary. Reporting the features you know the words for, not the features that matter, is a selection error.

Separating a misread chart from a language mistake

The two causes of a lost mark feel alike and need different cures. A wrong comparison, a swapped year or an invented trend is a data problem: you read the visual wrongly. A missing article, a wrong tense or a repeated verb is a language problem. In IELTS Mentor AI, the Data Accuracy card in the Task 1 feedback separates a misreading of the chart from a language mistake, so you can see which kind of error to work on first.

Where this fits

The page on process diagrams and maps covers the other Academic visuals, and the IELTS Writing test format guide puts both tasks and the four criteria in one place. The answer on how long the Writing test is gives the timing, and the guide to the General Training letter is the page for the other version of Task 1.