IELTS Writing Task 1: How to Describe Trends in Graphs and Charts (Free Practice Tool)
In IELTS Academic Writing Task 1 you have about 20 minutes to describe a graph, chart, table or diagram in at least 150 words. It counts for a third of your Writing score, and it is where many candidates lose easy marks: not because their English is weak, but because they list numbers without a clear overview and write increase six times.
This guide gives you the structure examiners expect, the vocabulary for every kind of trend, and two free tools: the Trend Lab, for finding the right word and building accurate sentences, and the Practice Desk, a timed task that checks your answer in seconds.
Quick answers
How long should Task 1 be? At least 150 words in about 20 minutes. Going over is not penalised, but a long Task 1 eats into the 40 minutes you need for Task 2.
What matters most? A clear overview of the main trends. At Band 7, examiners look for a clear overview with the main trends or differences identified.
How many paragraphs? Four works well: an introduction, an overview and two detail paragraphs.
Should I give reasons or my opinion? No. Describe and compare only what the visual shows.
Which tense? Past simple for past dates (rose, fell), and forms like is expected to for predictions.
What Task 1 is really testing
Examiners mark Task 1 on four criteria, each worth a quarter of the score: Task Achievement, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy.
Task Achievement is the one that catches people out. At Band 7, the descriptors look for a clear overview, sensibly grouped data and the main trends or differences identified. At Band 5, the description of detail is mainly mechanical, with little sense of the bigger picture. In other words, the examiner wants a summary, not a list.
Lexical Resource is where trend vocabulary comes in. Band 7 asks for some flexibility and precision and an awareness of collocation. In Task 1, that means knowing that sales rise sharply, unemployment peaks at 12% and a figure levels off, and using a range of these rather than one word on repeat.
General Training Task 1 is a letter, not a graph. If you are not sure which test you need, read IELTS Academic or General Training: which test should you take?
The four paragraph structure
Introduction (one sentence). Paraphrase the task: what the visual shows, where and when. Do not copy the question; copied words are not counted.
Overview (two sentences). The two or three biggest patterns, with no numbers. Start with Overall, so the examiner cannot miss it.
Detail paragraph 1. One group of related data, supported with figures.
Detail paragraph 2. The remaining group, with comparisons.
Spend 3 minutes studying the visual and grouping the data, 15 minutes writing and 2 minutes checking figures, prepositions and tenses. There is no need for a conclusion: the overview does that job, which is why it belongs near the top.
How to write an overview examiners notice
Before you write a word, ask three questions. What is the biggest category? What changed the most? What stayed roughly the same? Your answers are your overview.
Weak: Overall, the car was 62% in 2000 and 41% in 2020, and the bicycle was 8% and 30%.
Stronger: Overall, the car remained the most common way to travel to work, although its share fell considerably after 2005. Cycling, by contrast, grew rapidly and overtook the bus, whose share barely changed.
The first version repeats numbers. The second describes the shape of the data in two sentences, and every detail paragraph that follows simply supports it. Useful openings: Overall, In general, It is clear that and The most striking feature is.
Trend vocabulary: the words you need
Here is the core vocabulary, grouped by what the line is doing. The strength of each word matters as much as the meaning: dip and plummet both describe a fall, but one is small and the other is dramatic. Choosing the wrong one misrepresents the data.
Going up
rise (rose, risen), increase, grow (noun: growth): safe, neutral choices for any upward trend.
climb: a steady rise over time.
jump, surge, shoot up: a sudden rise, often over a short period.
soar, rocket: a very large rise. Use them once at most.
double, triple: precise and impressive when the numbers allow it.
recover: a rise after a fall.
Going down
fall (fell, fallen), decrease, drop: safe, neutral choices.
decline: often a gradual fall over time.
dip: a small, temporary fall. Never use it for a big drop.
plunge, slump, plummet: a sudden, very large fall. Plummet has no common noun, so write a dramatic fall instead.
halve: fall by exactly half.
Staying the same
remain stable, remain steady, remain unchanged: always with at and a figure.
level off, plateau, stabilise: stop changing after a rise or a fall.
hover around: move a little but stay close to one figure.
Going up and down
fluctuate, vary: always give the range, for example fluctuated between 21% and 25%.
Highest points, lowest points and crossing lines
peak at, reach a peak of, hit a high of: the top of a line.
hit a low of, reach its lowest point, bottom out at: the bottom of a line.
overtake, surpass, exceed: when one line passes another. By 2015, cycling had overtaken the bus.
How big and how fast
Adverbs describe a verb (rose sharply); adjectives describe a noun (a sharp rise). From strongest to weakest: dramatically, sharply, significantly, considerably, moderately, slightly, marginally. For speed: rapidly, steadily, gradually.
Do not stack a strong verb with a strong adverb. Plummeted dramatically says the same thing twice; plummeted is enough.
Two sentence patterns that double your range
Most trends can be written in two ways. Switching between them is an easy way to show grammatical range.
Verb + adverb: The number of cyclists rose sharply between 2010 and 2015.
There was + adjective + noun: There was a sharp rise in the number of cyclists between 2010 and 2015.
Time as the subject: The period between 2010 and 2015 saw a sharp rise in the number of cyclists.
The small words that cost marks
rose to 30% gives the end point; rose by 10 points gives the size of the change.
a rise in sales says what changed; a rise of 10% says how much.
peaked at 64% in 2005: at for the figure, in for the year.
remained stable at 40%, not on or with 40%.
between 2000 and 2010 or from 2000 to 2010, never from 2000 and 2010.
rose, not raised. Raise needs an object: the council raised bus fares.
Percentage points: a change from 20% to 30% is a rise of 10 percentage points, which is a 50% increase. Examiners notice this precision.
The Trend Lab: find the word, build the sentence
Pick what the line is doing and watch the chart change as you adjust the size and speed of the trend. The Lab suggests the words that fit, shows them in a sentence and warns you about common traps. Then build sentences from your own figures and try the spot the mistake quiz.
Comparing figures, not just listing them
Strong answers connect the data. A few phrases do a lot of work:
twice as high as, three times as many as
the highest proportion, the lowest figure
whereas, while, by contrast
24% and 22% respectively
just under, just over, roughly, almost
a quarter, a third, half, three quarters (more natural than 25%, 33%, 50% and 75% every time)
Practise now: the Task 1 Practice Desk
Choose a line graph or a bar chart, start the 20 minute timer and write your answer. When you finish, the Practice Desk checks your length, overview, trend vocabulary, use of data and the common errors above, then marks them in your text. Tick off the key features you covered, and compare your answer with a model.
The data is invented for practice. Your writing stays in your browser and is never sent to us.
Taking the computer-delivered test? Type your practice answers rather than writing them by hand. Our guide to IELTS going fully computer-based in 2026 explains what changes and includes a free typing check.
Five habits that cost marks in Task 1
No overview, or one buried at the end. A clear overview is one of the plainest differences between Band 6 and Band 7 answers.
Describing every number. Select the key features; minor details can go.
Copying the question. Copied words are discounted, so paraphrase your introduction.
Explaining why. If the chart does not show why cycling grew, do not guess.
One trend word on repeat. Five uses of increase tell the examiner your range is limited.
Want a teacher's eye on your Task 1?
A tool can spot patterns. A teacher can tell you why your overview misses the point, which data to cut and exactly what is holding your score below the band you need.
I am an IELTS teacher with more than 13 years of experience in UK colleges and universities, a Cambridge CELTA and the British Council IELTS Trainer Masterclass. In my IELTS Preparation sessions we work through full practice tests, you get written feedback on your Task 1 and Task 2 answers, and we build a study plan around your target band. Sessions are one hour and online, on Zoom, Google Meet or whichever platform suits you.
Working on Task 2 as well? Paste your essay into the free IELTS essay checker, read 5 IELTS Writing Task 2 mistakes that cost you marks, or see how your Writing band is calculated. Not sure what score you need? Check which IELTS score you need for your UK visa.
At university, describing data in an assignment or dissertation uses exactly the same language. My Academic Writing and Research Skills course covers it in depth.
Important
The Trend Lab and Practice Desk give quick, automated feedback on patterns in your writing. They are not an official IELTS score and are not endorsed by IELTS, the British Council, IDP or Cambridge. The charts and figures in this article are invented for practice.
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