Filler words like 'um', 'uh', and 'you know' appear in the speech of native English speakers at every level, including academics and professional speakers. The question for IELTS is not whether you use them but how frequently — and what pattern they create when the examiner listens to your overall fluency.
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What the band descriptors say about hesitation
At band 5, responses contain 'frequent repetition and self-correction' and 'hesitation is often present.' At band 6, there is 'some repetition' but speech is 'generally coherent.' At band 7, speech is 'extended without noticeable effort' but 'some hesitation' is explicitly acknowledged as acceptable even at this level. The key word across all descriptors is frequency — occasional hesitation is expected and accepted; constant hesitation that interrupts the flow of communication is what reduces scores.
The distinction the descriptors draw is between hesitation that is noticeable (meaning it interrupts the listener's ability to follow the message) and hesitation that is natural (meaning the listener barely registers it). A single 'um' in a 20-second response is not noticeable. Three fillers in one sentence consistently throughout the test absolutely is.
How many fillers is too many?
There's no official threshold, but a practical guide based on the band descriptors: one filler per 10-15 seconds of speech is generally invisible to examiners — it reads as natural thinking. One filler every 5 seconds starts to affect fluency perception. Three or more fillers in a single sentence, repeated consistently throughout the test, places a speaker firmly in band 5 fluency territory.
Most learners are genuinely surprised when they count their own fillers from a recording. The subjective sense of how often you say 'um' while speaking is almost always lower than the actual frequency — because you're busy thinking about what to say next. Recording and counting is the only reliable way to know your actual baseline.
Why replacing um/uh with silence is better
Silence during thinking is not penalized in IELTS speaking. A deliberate 2-second pause followed by 'I think the main reason is...' sounds more controlled and confident than 'um, uh, I think, um, the main reason is...' The examiner hears the pause as thinking; they hear the fillers as a fluency disruption. Silence plus a thinking phrase is the correct replacement strategy — not silence alone (which can feel abrupt) and not simply adding more fillers.
The repair sequence that works: pause (1-2 seconds) + thinking phrase + content. 'What I mean is...', 'Let me put it this way...', 'Actually...' — these phrases do the same cognitive work as um and uh (they signal 'I'm still speaking, give me a moment') but they contribute to the coherence score rather than undermining the fluency score.
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See your score first, fix one weak pattern, and retry the same topic with clearer fluency and stronger structure.
How to reduce fillers without robotic speech
Don't aim to eliminate fillers entirely — that goal produces stilted, over-controlled speech that sounds memorized. Aim instead to replace frequent fillers with thinking phrases and deliberate pauses. The shift from 'um' to 'What I mean is...' is small enough to feel natural but significant enough for the examiner to register a higher fluency level.
Practice drill: record 5 answers this week and count fillers in each. Write the number down. The awareness alone reduces frequency by 30-40% for most learners without any other intervention — simply knowing you're going to count them changes the behavior. After awareness, add the deliberate pause practice: before each new sentence, pause for 1 full second. This single habit breaks the reflex that produces fillers.