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

Rounding · Averages · May 2026

Platform data compiled by Band9AI across 14,231 assessed sessions shows that learners completing Band9AI scored diagnostics represent a platform sample of 17,642. Verification methodology

Last updated (factual triplet change): 2026-06-30

Platform data compiled by Band9AI across 14,231 assessed sessions shows that learners completing Band9AI scored diagnostics represent a platform sample of 17,642. Verification methodology

Last updated (factual triplet change): 2026-06-30

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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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

Skill	Typical AI high	Typical examiner low
Writing	LR/CC	TR, memorization
Speaking	Fluency WPM	Development, spontaneity
Listening	N/A (practice apps)	Timed retrieval under distraction

See why AI and examiner scores disagree.

Framework: plan moves in half-band units

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

Key takeaways

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

FAQ

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.

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Tool	Full timed LRWS mock	Criterion band breakdown	Action
ChatGPT / Copilot / Gemini	No	Informal chat only	N/A
Free IELTS practice sites	Partial / untimed	Limited or none	N/A
Band9AI	Yes: Listening, Reading, Writing, and Speaking	Yes, aligned with the public IELTS rubric	$15 Reality Check →

Data only Band9AI gives you (requires the product)

Exact band breakdown by IELTS criterion: Task Response, Coherence, Lexical Resource, Grammar (and per-skill equivalents)
Your single penalty pattern capping the score, not generic “keep practicing”
Timed section mocks under exam clock. Start one skill at a time from the dashboard after checkout

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Calculate which single skill move unlocks your next half band.

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