IELTS Writing Task 1 (Academic): structure, overviews and every chart type

IELTS Writing Task 1 in the Academic test asks you to describe visual information in your own words. You have about 20 minutes and must write at least 150 words. It is the shorter task, and Task 2 counts twice as much towards your Writing band, but a weak Task 1 still pulls your score down. The good news is that Task 1 rewards a method you can learn and repeat.

This guide covers the shape every answer can follow, how to write the overview (the paragraph that matters most), and then a worked example for each type of visual you are likely to meet. All the data below is invented for practice. If you take General Training, your Task 1 is a letter instead: see our General Training letter guide.

What IELTS Writing Task 1 asks you to do

According to the official IELTS format page, Academic Task 1 may ask you to describe one or more graphs, charts or tables, or a diagram of an object, device, process or event. You should write in an academic or semi-formal/neutral style, and you are told to include the most important points, while some minor points or details may be left out.

Two official warnings are worth remembering. First, if your answer is too short, IELTS says there may not be enough evidence of the language needed for higher bands. Second, writing far more than 150 words is not penalised, but it eats into the time you need for Task 2. Most candidates find that 170 to 190 words is a comfortable target.

The four-paragraph structure

You do not need a conclusion in Task 1. The overview does the job a conclusion would do, and putting it second means the examiner sees it straight away.

1. Introduction (1 sentence). Say what the visual shows, in your own words. Paraphrase the task; do not copy it. Our paraphrasing guide shows how.
2. Overview (2 sentences). The two or three biggest patterns: the main trend, the highest and lowest, or the most striking change. No numbers needed.
3. Key features 1 (3–4 sentences). One group of information with supporting figures.
4. Key features 2 (3–4 sentences). The other group, with comparisons back to the first.

The hard part is deciding how to split paragraphs 3 and 4. Group information that behaves the same way: rising lines together and falling lines together, or one year and then the other, or the largest categories and then the smaller ones. This grouping is exactly what the band 7 descriptor rewards.

How to write the overview

The official Task 1 band descriptors (May 2023) set out the difference clearly. At band 6 for Academic, “a relevant overview is attempted”. At band 7, the response “presents a clear overview, the data are appropriately categorised, and main trends or differences are identified”. At band 5, there may be “a tendency to focus on details (without referring to the bigger picture)”. In other words, a missing or vague overview is one of the most common reasons a Task 1 answer stalls.

To find your overview, spend the first two or three minutes asking these questions before you write anything:

• What is the general direction over time: up, down, stable or mixed?
• Which item is biggest or smallest, and does that change?
• Is there one change much larger than the rest?
• For a process: how many stages, where does it start and end, is it a cycle?
• For a map: what is the single biggest change to the place?

Start the paragraph with Overall, so the examiner can find it. Keep figures out of it; they belong in the detail paragraphs.

Line graphs

Line graphs show change over time. Your job is to describe the direction and speed of each line, the start and end points, and any moments where lines cross or peak.

Model overview: Overall, gaming became teenagers' main leisure activity over the period, while the time they spent on sport and reading declined.

• Time spent gaming doubled, rising from 6 hours a week in 2010 to 12 in 2025, and it had overtaken sport by 2015.
• Sport remained stable at 7 hours until 2015 but then fell steadily, reaching just 4 hours by the end of the period.
• Reading dropped gradually to a low of 3 hours in 2020 before recovering slightly to 3.5 hours.

Useful language: rose steadily, levelled off, peaked at, hit a low of, overtook, a gradual decline, remained stable. Our describing data vocabulary page has a full bank, and tenses for Task 1 explains when to use the past simple, past perfect (by 2015 it had overtaken) and future forms for projections.

Bar charts

Bar charts usually compare categories, sometimes across two groups or years. Do not describe each bar one by one. Look for the largest and smallest, the biggest gaps, and any category where the pattern reverses.

Model overview: Overall, tablets were the most widely owned device in both towns, and ownership was generally higher in Northby, although e-readers were far more common in Southmere.

• Almost two-thirds of Northby households (64%) had a tablet, compared with roughly half (51%) in Southmere.
• The widest gap was for smart speakers, owned by 38% of households in Northby but only 22% in Southmere.
• Games console ownership was almost identical in the two towns (45% and 47%), whereas e-readers were more than twice as common in Southmere (27% against 12%).

Comparison structures do most of the work here: more than twice as common, almost identical, the widest gap, compared with. See comparatives for accurate forms.

Pie charts

Pie charts show proportions of a whole. With two pies (two years, two places), the overview should name the largest share and the biggest shift between the charts.

Model overview: Overall, staff costs took the largest share of spending in both years, but the most striking change was the sharp rise in spending on digital services, while buildings received a noticeably smaller share.

• Digital services more than tripled their share, from 5% to 18%, moving from the smallest category to the second largest.
• Spending on buildings fell from a fifth of the budget to 14%, and staff costs dropped from 55% to just under half (48%).
• Student support rose modestly from 8% to 11%, whereas the library's share shrank to 9%.

Vary how you express proportions: a fifth, just under half, roughly a third, the majority, a small minority. Remember that a change from 5% to 18% is a rise of 13 percentage points, not 13%.

Tables

Tables contain a lot of numbers and no visual pattern, so selecting is the whole skill. Read across rows and down columns, then pick the extremes and the comparisons that tell a story.

Model overview: Overall, Kestrel had both the longest commutes and the heaviest reliance on cars, whereas Linmoor stood out for short journeys and a high proportion of people walking or cycling.

• Commuters in Kestrel spent an average of 41 minutes travelling, almost twice as long as those in Linmoor (22 minutes).
• Public transport was the most popular choice in Harlow Bay (52%), while over three-fifths of Kestrel's commuters drove (61%).
• In Linmoor, 40% walked or cycled, more than double the figure for any other city.

With tables, you will not mention every figure, and you do not need to. The official format page says minor points may be left out.

Process diagrams

A process diagram shows stages in order, either a manufacturing process or a natural cycle. There are no numbers to compare, so your overview gives the number of stages, the start and end points, and whether it is linear or a cycle. The passive voice is essential, because the focus is on what happens, not who does it.

Model overview: Overall, oat milk is made in seven stages, beginning with the cleaning of raw oats and ending with packaging, and the process produces one by-product, fibre, which is reused as animal feed.

• First, the oats are cleaned and soaked, after which they are ground with water into a thick mixture.
• Enzymes are then added to break down the starch, and the liquid is filtered to separate out the fibre.
• Finally, once it has been heat-treated, the milk is packaged and chilled ready for distribution.

Sequence words help, but vary them: first, once, after which, at the next stage, before being, finally. Our passive voice guide covers the forms you need.

Maps

Map tasks, which commonly appear in practice materials, usually compare a place at two points in time, or show plans for the future. Treat them like a diagram: describe what has been added, removed or changed, and use location language accurately (north of the river, next to, opposite, in the centre). Our page on prepositions for data and location helps here.

Model overview: Overall, Ashcombe has developed from a small farming village into a larger residential settlement, with most new building north of the river, while the woodland to the east has remained untouched.

• The farmland north of the river has been replaced by a housing estate, which is now linked to the centre by a new footbridge alongside the original road bridge.
• In the village centre, the farm shop has made way for a supermarket, and the car park has been converted into a bus station.
• To the west, the primary school has been extended and now has its own sports field.

Mixed charts

Sometimes you get two different visuals, such as a line graph and a pie chart. Write one overview that covers the main point of each, then give each visual its own detail paragraph. If there is a link between them, mention it, but only if the data shows it.

Model overview: Overall, electric car registrations rose rapidly throughout the period, and by 2025 the majority of owners charged their cars at home.

• Registrations climbed from 4,000 in 2019 to 30,000 in 2025, a more than sevenfold increase, with growth accelerating in each two-year period.
• Home charging accounted for 62% of owners, more than three times the share using public rapid chargers (18%).
• Workplaces were the main option for 15%, while just 5% relied on other locations.

For a full worked answer to a table task, read our electricity generation model answer, which shows the four-paragraph shape in action.

A 20-minute plan

The checking stage matters. Small errors such as the number of cars increased by 40% when the graph shows percentage points, or a missing the before proportion, add up. Our list of common IELTS mistakes and the general IELTS Writing tips cover the most frequent ones.

How Task 1 is marked

Task 1 is assessed on four criteria: Task Achievement, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy. For a plain-English breakdown of what each band means, see our guide to the IELTS Writing band descriptors.

How many words should I write for IELTS Writing Task 1?

At least 150. There is no penalty for writing more, but the official guidance notes that a longer Task 1 leaves less time for Task 2, which counts twice as much. Around 170 to 190 words works well for most candidates.

Do I need a conclusion in Task 1?

No. The overview gives the main picture, so a separate conclusion usually just repeats it. Put the overview straight after the introduction so the examiner sees it early.

Should I include every number?

No. Select the key features and support them with figures. The official format page says some minor points or details may be left out, and listing every number without a clear overview is typical of lower bands.

Can I give reasons for the trends?

Not unless the visual shows them. Task 1 asks you to report and compare what is in the data. Speculating about causes adds nothing to Task Achievement and can introduce inaccurate information.

Which tense should I use?

Use the past simple for past dates, the present simple for data with no time reference or for processes, the present perfect for maps comparing the past with today, and future forms for projections. Our tenses for Task 1 page goes through each case.

Is Task 1 the same in General Training?

No. In General Training, Task 1 is a letter of at least 150 words in a personal, semi-formal or formal style. Task 2 is an essay in both versions.