A Grammarly rank of 100 corresponds to zero mistakes found by Grammarly.
Our writing scores/ranks are compiled using a thorough outline of the grammatical algorithms that we use to analyze your text. The score provided by Grammarly is generated for your consideration only; it should not be used to determine an official academic grade or other benchmark that necessitates human input.
Your Grammarly rank depends on the alert density (the number of alerts per text unit) of your document. Different alerts have different weights (orthographic and grammatical mistakes subtract more points than other mistakes). The rank is intended to demonstrate your progress during text editing.