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IELTS Half-Band Rules: How Four Skills Become One Overall Score

Rounding · Averages · May 2026

Updated

Direct answer

Your overall IELTS band is the average of four skill scores, rounded to the nearest half band. Add Listening, Reading, Writing, and Speaking, divide by four, then round: .25 and below rounds down; .75 and above rounds up (e.g. 6.25 → 6.0, 6.75 → 7.0). Individual skills are reported in half bands too. Understanding this math prevents retake surprises when one skill drags the average.

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IELTS Half-Band Rules: How Four Skills Become One Overall Score. Mustafa Darras, Band9AI · ielts half band rules explained Written by Mustafa Darras, AI Systems Architect. meet the founder.

What half bands represent

Construct gap AI measures language surface; examiner measures communicative success
Penalty gap Templates and scripts penalized by humans, ignored by AI
Novelty gap Examiners score first-time performance; you practice repeats
Criterion fusion Examiners cap overall at weakest criterion; AI averages subscores

Rounding examples that matter

SkillTypical AI highTypical examiner low
WritingLR/CCTR, memorization
SpeakingFluency WPMDevelopment, spontaneity
ListeningN/A (practice apps)Timed retrieval under distraction

See why AI and examiner scores disagree.

Framework: plan moves in half-band units

  1. Identify which cause applies from blind-task logs.
  2. Apply cause-specific drill (TR outlines, blind Speaking, etc.).
  3. Re-test with calibration offset.
  4. Track whether gap shrinks over three blind cycles.

Key takeaways: IELTS Half-Band Rules

  • Overall = average of four skills, rounded to nearest 0.5, rarely random examiner mood.
  • .25 down / .75 up thresholds decide many visa cutoffs
  • A 0.5 overall change often equals one skill moving half a band
  • Pair with Band 6 meaning for descriptor context

IELTS Half-Band Rules: common questions

Raw correct answers convert to band tables (whole or half); those bands enter the overall average.
No, overall is only reported in 0.5 steps after rounding.
Most tools mimic half bands; calibrate because AI can mis-round borderline Writing/Speaking.

Official IELTS references

The criteria and score bands on this page follow the public IELTS documents below. Band9AI is independent and not affiliated with the British Council, IDP or Cambridge.

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Practice drill: IELTS Half-Band Rules

Reading helps you understand the problem. A timed mock shows how it affects your band, one IELTS criterion at a time.

Free 2-min band diagnostic →
ToolTimed four-skill mockScore for each criterionAction
ChatGPT / Copilot / GeminiNoChat onlyN/A
Free IELTS practice sitesPartial / untimedLimited or noneN/A
Band9AIYes: Listening, Reading, Writing, and SpeakingYes, based on the public IELTS band descriptors$15 Reality Check →

What you get from a Band9AI mock

  • A band for each criterion, such as Task Response, Coherence and Cohesion, Lexical Resource and Grammar in Writing
  • The one mistake pattern holding your score back, not generic advice to keep practising
  • Timed practice for one skill at a time, from your dashboard after checkout
Diagnose your penalty pattern for $15 (timed mock) Free diagnostic first

Calculate which single skill move unlocks your next half band.

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