How does ECE calculate Equivalent Grades?

[Ortho Husband]

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My understanding is that ECE converts marks on transcripts into US equivalent grades (4.0 scale). What is the basis of this conversion since marks from a dental school in India would be on a percent scale and different schools in India have a different marking mechanism - some give students high percentages (70% to 80% range) whereas some traditionally give marks in low percentages (60% to 70%).

Thanks in advance.