TOEFL Raw to Scaled Scores: An Explanation
In the TOEFL reading section you must answer 30 questions, worth a maximum of 33 points. This is your raw reading score. It is converted to a score from 1 to 30 points (displayed on your score report) which is your scaled reading score.
In the TOEFL listening section you must answer 28 questions, worth a maximum of 28 points. This is your raw listening score. It is converted to a score from 1 to 30 points (displayed on your score report) which is your scaled listening score.
Note that you might be given an extra set of ten additional reading questions, or a set of 11 additional listening questions. These will not be scored. Note that the extra set could appear at the beginning, middle or end of the section. You will never know which set is “extra.”
The Actual Raw to Scaled Conversion Method is a Secret
The actual raw to scaled conversion method is a secret. Actually, every test has a different conversion. This means that sometimes you need to answer every single question correctly to get a perfect score, but sometimes you can make a few mistakes and still get a perfect score. The conversion is based on the difficulty of the specific test. Here’s what ETS says:
“…despite the best efforts of test designers, no two test forms can ever be exactly alike. Each form is composed of different questions, which means that each test form differs slightly from other test forms in its level of difficulty. Therefore, number-correct (raw) scores are bound to a specific test form and are not directly comparable across forms.” (source)
The difficulty of a given test is determined through a process called equating. In practice, this means that each test contains questions that have been “pre-tested” in the past. I assume these questions are contained in the extra sets mentioned above.
A Rough Raw-to-Scaled Reading Chart
If you must have a basic conversion chart for the reading section, you can just use math. Here’s the easy formula: (RAW/33) * 30 = SCALED. Round the fractions. Note that this chart is just a guess. Here’s what it looks like:
A Rough Raw-to-Scaled Listening Chart
Likewise, you can make a basic conversion chart for the listening section of the TOEFL with the following formula: (RAW/32) * 30 = SCALED. That chart looks like this:
How about the Speaking and Writing Sections?
Oh, who the f–k knows? I’ll write an article about them in the future, but now that the e-rater and SpeechRater are in full use it is impossible to know exactly how the questions are graded. We know how about the raw scores from human graders, but the AI graders are mysterious. We don’t even know how they are weighted versus the human graders. Just note that the speaking and writing scores are adjusted up and down depending on the difficulty of a given test. I think.
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