IELTS is a standardised proficiency test. It can be used to reach a global audience. Find out how IELTS is calculated and how you can best use it.
The Powers Sumner Kearl formula was developed in the 1950s by a group of readability experts. Find out how you can use it to improve your writing.
The Raygor readability graph is a formula which calculates the reading grade level of a text. Find out how it's calculated and how it can best be used.