Grammatical Range and Accuracy in Speaking: How Errors Are Actually Counted

Here is the fact that reframes this criterion. At band 8, a few basic errors may persist. At band 7, a few basic errors persist. Even band 9 allows the kind of mistakes characteristic of native speaker speech.

Errors are not what caps you. Candidates who believe otherwise tend to protect their accuracy by keeping every sentence short and safe, which loses them the other half of the criterion, and the name tells you there are two halves.

Accuracy is measured two ways, and neither is "did you make a mistake"

IELTS names exactly two indicators of accuracy. The first is error density, the number of grammatical errors in a given amount of speech. The second is the communicative effect of the error, meaning what it does to how intelligible and precise you are.

Both are ratios rather than counts. Three slips across two minutes of developed answers is a different density from three slips in four short sentences, and the second one is worse even though the number is the same. That is the mechanism behind the safety trap: keeping answers short does not reduce error density, because density has your own speech in the denominator.

The second indicator is the more forgiving one. An error that nobody notices, and that costs you no precision, weighs less than one that makes the listener reconstruct what you meant. A wrong preposition in a clear sentence is not the same event as a tense that leaves the examiner unsure whether something already happened.

What range actually means

Range is the half that gets neglected, and IELTS is unusually specific about it. Five things count.

The length of your spoken sentences. Appropriate use of subordinate clauses inside clauses and phrases. Complexity of the verb phrase, which means auxiliaries in continuous and perfect forms, modality, and the passive. Complexity of other phrases, meaning what you put before and after a head noun or adjective. And your range of sentence structures, particularly moving elements around to change what a sentence puts in focus.

That last one deserves attention because it is invisible in most preparation. "The government built it in 2019" and "It was in 2019 that the government built it" carry the same facts and put different things in focus. Being able to do that is grammatical range in the sense the descriptor means.

The ladder from 5 to 7 runs through complex structures

At band 5, complex structures are attempted, but they are limited in range, nearly always contain errors, and may lead to the need for reformulation. At band 6, you produce a mix of short and complex sentence forms and a variety of structures with limited flexibility, and though errors frequently occur in complex structures, they rarely impede communication. At band 7, a range of structures is used flexibly, error-free sentences are frequent, and both simple and complex sentences are used effectively despite some errors.

Follow one thread through those three. At 5, the complex attempt breaks and has to be restarted. At 6, it survives and carries meaning, with errors. At 7, error-free sentences become frequent while the complex attempts keep coming.

The reformulation at band 5 is worth noticing for a second reason. Restarting a sentence because its grammar collapsed is also the repetition and self-correction the fluency criterion marks down, so a structure you cannot yet control costs you twice. That is the honest case for attempting complexity you can nearly hold rather than complexity you cannot.

At the bottom of the scale, one structure does most of the work

Band 4 says subordinate clauses are rare, turns are short, structures are repetitive and errors are frequent. Read the first clause as the diagnosis and the rest as symptoms.

A subordinate clause is what lets one sentence hold two related ideas. Without one, a turn becomes a list of short statements, which is what "turns are short" and "structures are repetitive" describe. If you are working near this end of the scale, joining two ideas into one sentence with because, although, which or when moves more than any list of advanced tenses.

Where this sits in your Speaking band

The four criteria carry equal weight, so this is one quarter of your Speaking band and one sixteenth of your overall. How IELTS Speaking is marked covers how they combine, and the band score calculator shows what a change in one section does to the result.

Writing is assessed on a criterion with the same name and a different test. Grammatical Range and Accuracy in Writing judges sentences you can go back and repair; this one judges sentences you committed to while talking, which is why the descriptors tolerate error density that a written text would not.

The two standing rules apply here as everywhere. You must fully fit the positive features of a band to be awarded it, and you are rated on your average performance across all parts of the test.

Next in the series: pronunciation, the criterion whose odd bands carry no descriptor of their own.

The descriptor wording and the range and accuracy indicators above come from the public IELTS Speaking band descriptors and the Speaking key assessment criteria on ielts.org, last checked in September 2026. Neither document carries a revision date.