How the IELTS band score is calculated, and how to raise it

IELTS reports scores on a 9-band scale, from Band 1 (non-user) to Band 9 (expert). You receive a band for each of the four skills, Listening, Reading, Writing and Speaking, plus an overall band. Understanding exactly how those numbers are produced is the fastest way to stop losing marks you don't need to.

Listening and Reading: raw score → band

Both are marked out of 40. Your raw score (the number of correct answers) is converted to a band using a fixed conversion table. As a rough guide, around 30/40 maps to Band 7 and 35/40 to Band 8, though the exact table varies slightly by test. Every mark counts, and spelling and grammar must be correct.

Writing and Speaking: four criteria

These are marked by criteria, each weighted equally:

• Task Achievement / Task Response
• Coherence & Cohesion (Fluency & Coherence in Speaking)
• Lexical Resource
• Grammatical Range & Accuracy (plus Pronunciation in Speaking)

How the overall band is rounded

Your overall band is the average of the four skill bands, rounded to the nearest half-band. A .25 average rounds up to the next half-band, and .75 rounds up to the next whole band. So a 6.75 average becomes 7.0. Meaning a single half-band in your weakest skill can lift your overall score.

The rounding rule worked through

This is where people lose half a band without understanding why. The two rules that matter are that .25 rounds up to the next half-band and .75 rounds up to the next whole band; everything else goes to whichever half-band is nearer. Five real profiles:

Why one weak skill is worth fixing first

Because the overall band is a mean, half a band anywhere moves the average by 0.125, and the rounding boundaries sit close together. Take the third row above: 7.0, 7.0, 6.5, 6.0 gives an overall 6.5. Lifting Speaking alone from 6.0 to 6.5 makes the average 6.75, which rounds up to a 7.0 overall. The same half-band added to Listening instead, taking it from 7.0 to 7.5, produces an average of 6.75 as well — so either works, but the weak skill is almost always the cheaper place to find it.

This is also why chasing your strongest skill is a poor strategy. Going from 7.0 to 8.0 in Reading, which is hard, moves the overall by the same amount as going from 6.0 to 7.0 in Speaking, which for most candidates is considerably easier.

Writing: why Task 2 counts double

Your single reported Writing band is weighted, with Task 2 counting roughly twice Task 1. The practical effect is larger than most candidates expect, and it is the strongest argument for the standard 20/40 minute split.

Take the same two task scores in each order. The figures below are illustrative — centres report one Writing band rather than publishing the internal arithmetic — but the direction is exactly right:

A strong Task 1 cannot rescue a weak Task 2

The two rows above use the same pair of numbers and land a full band apart. That is the whole case for protecting Task 2 time: 20 minutes on Task 1 and 40 on Task 2, and if you are running out of time, an under-developed Task 1 costs you far less than an unfinished Task 2.

Where the easiest half-bands hide

• Listening/Reading: fix careless spelling and word-limit errors, pure lost marks.
• Writing: add a clear overview (Task 1) and a consistent position (Task 2).
• Speaking: extend every answer with a reason and an example.
• Target your weakest skill: rounding rewards lifting the lowest number.

Where to go next

This guide covers the method. Two companion pages cover the numbers themselves:

• IELTS band score chart: raw score to band conversion for Listening and Reading
• IELTS band scores explained: what each band means to a university or visa route
• IELTS band score calculator: work out your overall band from four skill scores