How your score has been calculated

The Academic and General Training papers are graded to the same scale. 학생들의 시험결과 수준을 보고 평가하는(채점하는) 상대평가가 아닙니다!!!

Overall band score
Your overall band score is calculated by taking the mean score of the four test components (Listening, Reading, Writing and Speaking).? The score for each component is equally weighted. Your overall band score is rounded up to the nearest whole or half band.

For example: 반올림 된다는 거 아시죠? 실제로 점수는 0.5점 단위로 성적표에 나옵니다.
If you achieve 6.5 for Listening, 6.5 for Reading, 5.0 for Writing and 7.0 for Speaking, you?will be awarded an Overall Band Score of 6.5. Total score of 25 ÷ 4 = 6.25 which is a band score of 6.5.
If you achieve 4.0 for Listening, 3.5 for Reading, 4.0 for Writing and 4.0 for Speaking, you would be awarded an Overall Band Score of 4.0. Total score of 15.5 ÷ 4 = 3.875 which is a band score of 4.0.

Listening and Reading scores

IELTS Listening and Reading components each contain 40 questions. Each correct item is awarded one mark, therefore?the maximum raw score you can achieve for each component is 40. Band scores ranging from Band 1 to Band 9 are awarded to candidates on the basis of their raw scores.

The tables?are indicative of the number of marks required to achieve a particular band score.

Please note:?In order to equate different test versions, the band score boundaries are set so that all candidates’ results relate to the same scale of achievement. This means, for example, that the Band 6 boundary may be set at a slightly different raw score across versions.

Writing and Speaking scores
When marking the Writing and Speaking components of the test, examiners use detailed assessment criteria which describe written and spoken performance at each of the 9 IELTS bands.

Writing: Examiners award a band score for each of four criterion areas: Task Achievement (for Task 1), Task Response (for Task 2), Coherence and Cohesion, Lexical Resource and Grammatical Range and Accuracy. The four criteria are equally weighted.

Speaking: Examiners award a band score for each of four criterion areas: Fluency and Coherence, Lexical Resource, Grammatical Range and Accuracy and Pronunciation. The four criteria are equally weighted.

Assessment criteria
To get a better understanding of the level of performance required to attain a particular band score, you should familiarise yourself with the?assesment criteria.

My IELTS result will only be valid for two years. Why?
The IELTS partners recommend that a Test Report Form which is more than two years old should only be accepted if it is accompanied by proof that you have actively maintained or tried to improve your English.

출처:?http://www.ieltsessentials.com/results/about_your_result.aspx