Does one low criterion drag down your whole IELTS writing band?
Yes, but by a quarter per band, not a whole band. How four averaged criteria combine, the result that surprises people, and what to fix first.
Not necessarily. Twelve different criterion combinations average to exactly 6.5, and they call for opposite study plans. Here is every one, checked.
No — a 6.5 in IELTS writing does not have to mean two criteria scored 6. Two 7s and two 6s is only one of twelve combinations of criterion scores that average to exactly 6.5, and the different combinations need different, sometimes opposite, kinds of practice.
That matters because 6.5 is the score most candidates aiming for 7 get stuck on, and the usual assumption — "I'm a 7 on two things and a 6 on two things, so I need to nudge two areas up a bit" — is often wrong. This article lists every combination that produces a 6.5, shows two of them side by side, and explains why your score report cannot tell you which one you have.

Every row adds up to the same 6.5. No two rows need the same work.
Each Writing task is marked on four criteria: Task Response (Task Achievement in Task 1), Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy. IELTS states that the four are weighted equally and that the task score is their average. Each criterion is given as a whole band.
So a task average of exactly 6.5 needs four whole numbers that add up to 26. Two 7s and two 6s do that. So do three 7s and a 5. So does an 8 with three 6s — a script with no criterion at 7 at all.
The four numbers behind a 6.5 can be arranged in several very different shapes:
Each shape tells you something different about the script, and each points at a different next step. "Two criteria at 6" describes only the first.
One more layer sits on top. Your reported Writing band combines Task 1 and Task 2, with Task 2 counting double; the full calculation is in how the IELTS writing band is calculated. Everything below is about what sits under a single task's score — and because Task 2 counts double, its four criteria are usually where to look first.
We listed every set of four whole-band scores between 4 and 9 that totals 26 with a short script, rather than working them out by hand. Twelve sets come out. The table shows each one, the gap between its highest and lowest criterion, and how many different ways the four scores can be assigned to the four named criteria.
| Criterion bands (any order) | Total | Spread (high − low) | Ways to assign to the four criteria |
|---|---|---|---|
| 7, 7, 6, 6 | 26 | 1 | 6 |
| 7, 7, 7, 5 | 26 | 2 | 4 |
| 8, 6, 6, 6 | 26 | 2 | 4 |
| 8, 7, 6, 5 | 26 | 3 | 24 |
| 8, 8, 5, 5 | 26 | 3 | 6 |
| 8, 7, 7, 4 | 26 | 4 | 12 |
| 8, 8, 6, 4 | 26 | 4 | 12 |
| 9, 6, 6, 5 | 26 | 4 | 12 |
| 9, 7, 5, 5 | 26 | 4 | 12 |
| 9, 7, 6, 4 | 26 | 5 | 24 |
| 9, 8, 5, 4 | 26 | 5 | 24 |
| 9, 9, 4, 4 | 26 | 5 | 6 |
Counting the order — which criterion got which score — that is 146 distinct score profiles, all reported as the same 6.5.
A few notes on reading it.
Only exact 6.5s are listed. A total of 25 or 27 averages 6.25 or 6.75, which falls between half bands. How a quarter is resolved into a reported band is not published, and this article does not guess at it. The table counts only the profiles that land on 6.5 with no rounding at all.
The wide rows are possible, not typical. The bottom half of the table is arithmetic. A script with band 9 vocabulary and band 4 grammar would be strange, so you are unlikely to meet those profiles in your own results. The top five rows are the realistic ones.
The two 6s are not special. 7, 7, 6, 6 is the most even way to reach 6.5, which is probably why people assume it. But among the realistic rows it is one shape out of five, and the only one where no criterion is more than a band away from the rest.
The general rule — that each band lost anywhere costs a quarter on the task — is covered in does one low criterion drag down your whole IELTS writing band?. This article stays with the single score where that arithmetic hurts most.
Take two realistic rows from the table and put real scripts behind them.

Same total, different work: several small steps for one script, a single large one for the other.
Script A: 7, 7, 6, 6 — evenly a little short. Task Response and Lexical Resource are at 7. Coherence and Cohesion is at 6: the essay has clear paragraphs, but the linking is mechanical, with a connector at the start of nearly every sentence. Grammatical Range and Accuracy is at 6: complex sentences are attempted, but errors in them are frequent. Neither weakness is dramatic. To reach 7.0, both 6s need to become 7s, which means two criteria crossing the 6–7 line. The 6 and 7 descriptors differ mostly in how consistently and flexibly something is done, so this is steady, practice-heavy work — usually several essays, not one.
Script B: 7, 7, 7, 5 — one criterion sunk. Coherence and Cohesion, Lexical Resource and Grammatical Range and Accuracy are all at 7. Task Response is at 5: the question asked for causes and solutions, and the essay spent three paragraphs on causes and one sentence on solutions. The band 5 Task Response descriptor describes an essay that addresses the task only partially, and that is exactly what happened. The language is already at 7.
Script B is far closer to 7 than it looks. One decision — answer both parts of the question — removes the feature holding Task Response at 5. If the rest of the essay is unchanged, that criterion can climb two bands in one rewrite, and the total goes from 26 to 28: a clean 7.0.
So the two 6.5s need opposite plans:
The third realistic shape, 8, 6, 6, 6, is different again. A script with one criterion at 8 and three at 6 usually has a genuine strength, often vocabulary, carrying a script whose task handling, organisation and grammar are all a band short. That candidate has the most work ahead of the three, because three criteria need to move.
A small exception to the "sunk criterion moves fast" rule: if the sunk criterion is Lexical Resource or grammatical range rather than Task Response or organisation, the cause is rarely one decision, and it takes longer to lift. Which IELTS writing criterion should you fix first? works through that trade-off.
Here is the real problem with a 6.5. Script A and Script B produce the same number on the Test Report Form, and so does every other row in the table. The form gives one Writing band — not four criterion scores — so the shape of your 6.5 is not printed anywhere. Can you see your IELTS score for each writing criterion? covers what the report includes and what it leaves out.
That leaves most candidates guessing, and the guess is nearly always the same: "it must be my grammar." Grammar errors are the ones you can see when you reread your own essay. A half-answered question is much harder to spot in your own writing, because you know what you meant. So a Script B candidate can spend two months on grammar drills for a criterion that was already at 7, sit the test again, and get 6.5 again — one of the patterns behind being stuck at band 6.5 in IELTS writing.
The fix is to stop guessing at the shape and measure it. You need the four numbers, or at least a reliable estimate of them, before the table above becomes useful. A side-by-side example of what separates a 6.5 script from a 7 on the same question is in band 6.5 vs band 7 essay.
Paste a Task 2 essay below — ideally one written in 40 minutes on a question you had not seen before — and you get a separate estimate for each of the four criteria, with the sentences each judgement rests on.
Then read the result against the table:
These are estimates against the public band descriptors, of the kind a teacher gives, not official bands; only a certified examiner marking your test produces those. What the estimate gives you is the shape of your 6.5 — which is the one thing the score report leaves out.
Does a band 6.5 in IELTS writing mean two criteria scored 6?
Not necessarily. Two 7s and two 6s is one way to reach a 6.5 task average, but it is one of twelve combinations of whole-band criterion scores that add up to 26 and average exactly 6.5. Three 7s and a 5, or an 8 and three 6s, produce the same number.
Can I get 6.5 in IELTS writing with no criterion at 7?
Yes. An 8 on one criterion and 6 on the other three totals 26 and averages 6.5. A script like that has three criteria at band 6 and is carried by one strong criterion, which needs a very different plan from two 7s and two 6s.
Which kind of 6.5 is fastest to improve?
A 6.5 with one criterion well below the others, such as 7, 7, 7, 5, usually moves fastest, because a criterion that far below the rest often has a single identifiable cause. Fixing that cause can lift the criterion two bands at once. An evenly spread 6.5 needs two or more criteria to each cross a boundary.
Can I tell from my Test Report Form which criteria scored 6?
No. The Test Report Form gives one Writing band, not the four criterion scores behind it. Every one of the twelve combinations prints as the same 6.5, so the report alone cannot tell you which kind you have.
Is my overall Writing 6.5 the same as a Task 2 score of 6.5?
Not exactly. The Writing band combines Task 1 and Task 2, with Task 2 counted double. The criterion combinations in this article describe what sits underneath one task's score. Because Task 2 counts double, its four criteria are usually the most useful place to look.
The statement that the four Writing criteria are weighted equally and averaged is from the IELTS scoring in detail page. Descriptor features are paraphrased from the public Writing band descriptors published by IELTS.
Bandly grades your essay or letter against all four criteria and shows the gap to your target band, sentence by sentence.
Yes, but by a quarter per band, not a whole band. How four averaged criteria combine, the result that surprises people, and what to fix first.
You marked your essay a 7 and got a 6.5. The gap is not vanity: you read what you meant, not what you wrote. Where it opens, criterion by criterion.