Reading comprehension has no public grading scale
There is no openly published measure that turns one passage into a comprehension level, so this page never states a level and never attaches a grade or an age to your result. What it does instead is keep the outcome of a single passage as two plain numbers, reading speed and accuracy, so that a later attempt run the same way can be compared with this one.
How it is calculated
Reading speed is the word count divided by the minutes you spent. Accuracy is correct answers over total questions. The effective rate multiplies the two, and the result line says plainly that this is a formula used on this site rather than a standard index, because reading fast with low accuracy pulls that figure down.
Limits
Change the passage or the questions and the same reader gets a very different number. Collect several passages instead of drawing a conclusion from one. Knowing individual word meanings is a separate skill, so use the vocabulary self-check for that.
Frequently Asked Questions
No. There is no openly published measure behind it, and the result swings with passage and question difficulty. Do not read a grade or an age into the numbers.
It is reading speed multiplied by accuracy, a formula used on this site. It exists so that fast-but-careless and slow-but-accurate reading can be compared on one line. It is not a standardized index.
No. The figure is meant to isolate reading speed, so enter only the time spent reading the passage and leave answering time out for a cleaner comparison.