7.5 + 8.0 + 7.0 + 7.5 = 30 (Total of all the four modules)
30 / 4 = 7.5 (Average of the total score)
IELTS Overall Band Score is calculated between 0 to 9 Band.
The score is rounded up or down to the next half or whole Band. Take a look at these examples to understand the IELTS Scoring System better..