This is a table I use for my customers and myself. It is not 100% perfect between the grades but as good as I can determine.
(Sheldon Scale is the 70 point grading scale that was created by American Bill Sheldon) and is what is used in the United States and around the world now.
CGS Numerical Grade
Average Raw UK Grade
Average Standard USA Sheldon
100
FDC
MS70
99
FDC
MS70
98
FDC
MS70
97
FDC
MS70
96
FDC
M69+
95
FDC
MS69
94
AFDC
MS68+
93
AFDC
MS68
92
AFDC
MS67+
91
AFDC
MS67
90
NFDC
MS66
88
BU -NFDC
MS65+
85
Choice UNC - BU
MS65
82
Choice UNC
MS 64+
80
Choice UNC
MS 64
78
UNC
MS 63
75
UNC or near so
MS 62
70
AU
MS62
65
GEF
MS61
60
EF
AU58 - MS60
55
NEF
AU55
50
GVF
AU55
45
GVF
AU 53
40
VF
AU 50
35
NVF
XF 45
30
GF
XF 40
25
GF
XF35
20
F
XF30
15
NF
XF20
10
VG
XF15
8
VG
VG10
5
GOOD
VG8
4
FAIR
G4
3
FAIR
G3
2
FAIR
G2
1
FAIR
G1