GPA -Percentage
I came by this chart..Hope u find it useful.
And Iam not sure if this can be used for Engg marklists

GPA Conversion Chart:

4.0 - 95-100 - A
3.9 - 94 - A
3.8 - 93 - A
3.7 - 92 - A
3.6 - 91 - A
3.5 - 90 - A
3.4 - 89 - B
3.3 - 88 - B
3.2 - 87 - B
3.1 - 86 - B
3.0 - 85 - B
2.9 - 84 - B
2.8 - 83 - B
2.7 - 82 - B
2.6 - 81 - B
2.5 - 80 - B
2.4 - 79 - C
2.3 - 78 - C
2.2 - 77 - C
2.1 - 76 - C
2.0 - 75 - C
1.9 - 74 - C
1.8 - 73 - C
1.7 - 72 - C
1.6 - 71 - C
1.5 - 70 - C