IELTS Academic Writing Task 1: How to Describe a Pie Chart (Proportion Language for Band 7)
The pie chart looks like the friendliest visual in Academic Writing Task 1 — a few colourful slices and some percentages — yet it is where many candidates quietly lose marks. The reason is that a pie chart does not test trend language at all. It tests your ability to describe proportions: which slice is biggest, how the shares compare, and, when there are two or more charts, how those shares change. Get the proportion vocabulary right and a pie chart becomes one of the easiest Task 1 questions to score well on. This guide gives you the structure, the language, and a full model answer.
What a pie chart actually asks you to do
Task 1 is marked on four equally weighted criteria: Task Achievement, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy. You have 20 minutes and must write at least 150 words. For a pie chart, Task Achievement means you have identified the largest and smallest segments, grouped and compared the shares sensibly, and — crucially — included a clear overview. A report with no overview is capped at Band 5 for Task Achievement, no matter how good the rest is.
One idea decides everything else: a pie chart shows parts of a whole, and the parts always add up to 100 per cent. So your language should constantly signal proportion — "made up", "accounted for", "a share of" — rather than the "rose" and "fell" verbs you would use for a line graph.
The four-paragraph structure
- Introduction (1 sentence): paraphrase the question. Change the wording but keep the meaning.
- Overview (2 sentences): state the most striking features — usually the largest and smallest slices — with no specific figures.
- Body paragraph 1: describe the biggest segments in detail, with percentages.
- Body paragraph 2: describe the remaining, smaller segments, with percentages.
If you are given two pie charts (for example, the same categories in 2010 and 2020), change your grouping: use one body paragraph for the categories that grew and one for those that shrank, and let your overview name the single biggest change. The same shape works either way — only the grouping logic shifts.
Proportion vocabulary that scores
Strong Lexical Resource on a pie chart comes from three families of language: verbs of proportion, fraction and percentage phrases, and comparison structures.
Verbs and phrases for a share of the whole
- X accounted for / made up / constituted / represented 40 per cent of the total.
- The largest / greatest proportion went to X.
- X held / had the biggest share, at just over a third.
Fractions instead of bare numbers
Converting a percentage into an approximate fraction shows range and reads more naturally. Learn these conversions:
- 50% → half
- 25% → a quarter / one in four
- 33% → a third
- 20% → a fifth
- 10% → a tenth
- 75% → three quarters
Soften them with roughly, approximately, just over, just under, nearly: "just under a quarter", "roughly a third". This keeps your report accurate without repeating the same "X per cent" pattern in every sentence.
Comparison structures
- Twice / three times as much as: "Spending on housing was twice as high as spending on transport."
- Comparatives: "a far larger share than", "slightly smaller than".
- Ranking: "the second most common category", "the smallest segment".
Model answer
Imagine a pie chart showing how an average household spends its monthly budget: housing 40%, food 25%, transport 20%, and other 15%. A Band 7 report might read:
"The pie chart illustrates how a typical household divides its monthly spending across four categories. Overall, housing was comfortably the largest expense, while the smallest share was allocated to a mix of other items. Housing accounted for the greatest proportion of the budget, at 40 per cent — roughly twice as much as was spent on transport, which made up a fifth of the total. Food represented the second largest category at a quarter of all spending. The remaining 15 per cent, grouped as 'other', constituted the smallest share, standing just below the amount devoted to transport."
Notice how few "per cent" figures appear: the report leans on fractions, ranking words, and one clean comparison. That variety is exactly what the descriptors reward.
Common mistakes to avoid
- Using trend verbs on a single chart. With one pie chart there is no time axis, so nothing "rises" or "falls". Only use change language when two or more charts let you compare across dates.
- Skipping the overview. Begin it with Overall and name the biggest and smallest slices — this is where most easy marks are won.
- Listing every slice in order. Group and compare instead of reading the chart clockwise like a list.
- Adding opinions. Task 1 is a factual report; never explain why a category is large or say whether it is good.
Practise and check your work
Pie charts reward drilling because the proportion language repeats on every question. Write full 150-word reports in 20 minutes using authentic prompts on our IELTS Writing Questions page, then paste your answer into the free IELTS Writing Checker to get instant, criteria-based feedback on your Task Achievement and Lexical Resource. If your overview still feels shaky, our dedicated guide to the Task 1 overview paragraph shows you how to write the one sentence examiners look for first.
Master the fractions, lean on proportion verbs, and always open with a clear overview — do that, and the pie chart turns from a hidden trap into a reliable Band 7 opportunity.